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    GWSI Rotary Evaporators For Sale

    GWSI manufacture durable, high-quality rotary evaporators for sale to customers worldwide for 33+ years. GWSI supply CE certified rotary evaporators to help you grow business and get accurate reaction data.

    You will satisfied with GWSI rotary evaporators performance as we use famous brands components such as Siemens & Schneider Electric to manufacture your rotary evaporators.

    Ideal for use in smaller to medium-sized experiments.

    Suitable for university laboratory.

    Function: Crystallization and more

    Main Data

    • Model: R-3001
    • Evaporating Flask: 500ml, 1000ml
    • Rotation Speed: 10-280rpm
    • Temperature Range: Room temp+5℃ ~95℃
    • Evaporating Speed: 23.5ml/min (Water)

    Fit for all industries on analytic and more applications.

    Suitable for separation distillation.

    Function: Recrystallization and more

    Main Data

    • Model: R-3001
    • Evaporating Flask: 2000ml
    • Rotation Speed: 10-280rpm
    • Temperature Range: Room temp+5℃ ~95℃
    • Evaporating Speed: 23.5ml/min (Water)

    Keep you safe when working with
    larger quantities applications.

    Suitable for Concentrate and dry.

    Function: Distillation and more

    Main Data

    • Model: R-1005CE
    • Evaporating Flask: 5L flange opening, φ50mm
    • Rotation Speed: 20-140rpm
    • Temperature Range: 95℃ Max
    • Evaporating Speed: 2.0L/h(water)

    GWSI 10L rotary evaporator trusted by 2000+ customers worldwide.

    Suitable for Essential Oil Extraction.

    Function: Recycling and more

    Main Data

    • Model: R-1010CE
    • Evaporating Flask: 10L flange opening, φ125mm
    • Rotation Speed: 20-130rpm
    • Temperature Range: 95℃ Max
    • Evaporating Speed: 3.2L/h(water)

    You will receive 20L rotary evaporator in waterproof package.

    Suitable for Vacuum distillation.

    Function: Synthesizing and more

    Main Data

    • Model: R-1020CE
    • Evaporating Flask: 20L flange opening, φ125mm
    • Rotation Speed: 20-130rpm
    • Temperature Range: 95℃ Max
    • Evaporating Speed: 5.0L/h(water)

    GWSI supply 50L rotary evaporator for sale with international brands components.

    Suitable for industrail application.

    Function: Purifying and more

    Main Data

    • Model: R-1050CE
    • Evaporating Flask: 50L flange opening, φ125mm
    • Rotation Speed: 20-110rpm
    • Temperature Range: 95℃ Max
    • Evaporating Speed: 9.0L/h(water)

    Explosion Proof Rotary Evaporator For Sale

    GWSI 1010Ex Explosion Proof Rotary Evaporator For Sale is a better choice for sensitive condition.

    Main Data

    • Model: R-1010Ex
    • Evaporating Flask: 20L flange opening, φ125mm
    • Rotation Speed: 20-130rpm
    • Temperature Range: 95℃ Max
    • Evaporating Speed: 3.2L/h(water)

    GWSI 1020Ex Explosion Proof Rotary Evaporator For Sale will protect you from explode danger.

    Main Data

    • Model: R-1020Ex
    • Evaporating Flask: 20L flange opening, φ125mm
    • Rotation Speed: 20-130rpm
    • Temperature Range: 95℃ Max
    • Evaporating Speed: 5.0L/h(water)

    GWSI 2020Ex Explosion Proof Rotary Evaporator For Sale is suitable for complex situations.

    Main Data

    • Model: R-2020Ex
    • Evaporating Flask: 20L flange opening, φ125mm
    • Rotation Speed: 20-130rpm
    • Temperature Range: 95℃ Max
    • Evaporating Speed: 5.0L/h(water)

    Experience Excellence: GWSI's High-Quality Rotovap Solutions


    Easy-Use Rotovap: Multi-Experiment Flexibility

    Rotavap excels with adjustable angles and detachable bath for versatile flask compatibility and setup flexibility.

    Rotary evaporator used in lab

    Safe, Reliable Rotary Evaporators Operations

    Our rotary vacuum evaporator features a Teflon and fluoro rubber double seal, ensuring maximum experimental safety.


    Precision High-Accuracy Rotovap Machine Design

    Our industrial rotary evaporator boasts high precision with visual evaporating speed and temperature, controlled by PID for accuracy.


    Complete Rotary Evaporator Parts Range

    Our rotovaps come with a full, diverse rotovap parts lineup, offering 1-50L capacities to meet various experimental needs.

    Why Choose GWSI as Your Lab Rotary Evaporator Supplier?

    Years of expertise
    Patented Technologies
    Satisfied Customers
    m² Production Area

    Since our establishment in 1988, we’ve served over 30,000 customers and hold numerous patents, underscoring our innovation and reliability. Our lab rotary evaporators are chosen for over 100 university laboratory projects globally and exported to more than 20 countries. We ensure the highest quality through a rigorous 3-step quality control process: exterior inspection, performance testing, and electrical safety tests. Our commitment to excellence is further supported by our 24/7 customer support promise. Moreover, we have agents in the USA, Canada, Australia, Russia, and South Korea, making us a globally trusted partner for your lab rotary evaporator needs. Choose GWSI for unmatched quality and support.

    Top Materials for Superior Quality

    In crafting our laboratory rotary evaporator at GWSI, we go for only the best: high borosilicate 3.3 glass. This choice means our gear can handle heat and harsh chemicals like a champ, lasting longer and performing better. We don’t stop there. Our baths are made from 304 and 316 stainless steel, not just for their top-notch quality but also for their resistance to rust. Unlike others, we shape these with a single stretch, avoiding welds. This method fights corrosion and boosts the lifespan big time. With GWSI, you get durability plus innovation, all in one.

    Your Premium Rotary Evaporators Manufacturer

    GWSI is a leading rotary evaporator manufacturer and supplier in China since 1988 and we are the United Nations Industrial Development Organization research site. GWSI manages our own rotary evaporators and glass reactors manufacturing and quality control processes from beginning to end, strictly follows ISO:9001 quality management and 6S factory management.

    Experienced workers and well organized production line keep our rotary evaporators costs competitive.
    World talent professors leading innovative R&D team promise you with sustainable supply of new products.
    Independent technical engineers are always ready to solve your any problems in operation and applications.

    Rotary Evaporators Manufacturing

    GWSI has mini & large rotary evaporator workshop equipped with CNC lathe and more advanced process machine for rotary evaporators manufacturing.

    GWSI manunfacture rotary evaporators with reliable international brands material. You can expect our rotary evaporators to provide precise control and optimal results.

    Rotary Evaporators Quality Control

    GWSI implements strict quality control when manufacturing rotary evaporators. Our engineers make sure that all the moving parts of the rotavapor are working smoothly and accurately.

    GWSI QC inspectors check each inch of glass parts, making sure there are no bubbles, dents, scratches, dirt or knots. GWSI assemble each electric part carefully, whether it is a screw or wiring. You can analyze the quality and composition of glass we use to make condensers and flasks. 

    Rotary Evaporator Application

    Below are common applications utilizing a rotary vacuum evaporator across diverse scientific fields.

    Experiment Type Application Description
    Purification and Concentration of Organic Synthesis Products
    Used to remove solvents post-organic synthesis reactions, purifying and concentrating products.
    Solvent Exchange
    Evaporates one solvent in a solution to replace it with another, often for solvent sensitivity studies or further reactions.
    Concentration of Natural Product Extracts
    Concentrates and purifies active components from plant, animal, or microbial extracts.
    Raw Material Preparation in Drug Development
    In early drug development stages, used for rapid solvent evaporation to prepare higher purity raw materials or intermediates.
    Extraction and Concentration of Active Ingredients in Food and Flavors
    Extracts and concentrates active components in foods, beverages, or flavors, like essential oils and fragrances.
    Concentration of Pollutants in Environmental Samples
    In environmental science research, concentrates trace pollutants in water or soil extracts for subsequent analysis.
    Educational Experiments
    Demonstrates solvent evaporation, separation, and purification processes in teaching labs.
    Sample Preparation
    Removes solvents and concentrates samples before various chemical analyses, facilitating instrument processing.

    Rotary Evaporator For Distillation

    You can use GWSI rotary evaporator to make distillation for different solvents.

    GWSI supply rotary evaporators with overrun protection to ensure safety in daily use. 

    Rotary Evaporator For Crystallization

    GWSI Rotary Evaporator can fit for crystallization from 1L to 50L. You can easily make the crystallization process with our rotavap. It has mannual and electric control way to use..

    Rotary Evaporator For Extraction

    GWSI offer rotary evaporator for sale to let you make extraction for oil, petroleum and more industry.

    GWSI rotary evaporators is accessible in various volume such as and can be customized.

    Rotary Evaporator For Laboratory

    GWSI provide Lab Rotary Evaporator for university, small scale experiments. All our lab scale rotavap composed of high borosilicate glass to bear high temperature.

    You can get Rotary Evaporator at affordable price with international standards.

    Boost Efficiency with the Best Solvent Evaporator Partners

    While a rotative evaporator is already a highly efficient laboratory equipment, pairing it with a vacuum pump and a circulating chiller enhances evaporation efficiency, maintains equipment performance, and ensures experimental safety and environmental control.

    GWSI Rotary Evaporators Manufacturing Capacity To Support Your Need


    Rotary Evaporator Workshop

    Clean & tidy workshop


    Rotary Evaporator Materials

    Superior quality raw materials


    Rotary Evaporator Assemble

    Experienced workers for high eficiency


    Rotary Evaporator Quality Check

    Strictly QC control


    Rotary Evaporator Package

    Thickened pearl cotton for damage risk


    Rotary Evaporator Parts

    Supply accessories for long time

    Download Catalog
    Download Catalog

    Support Resource About Rotary Evaporators


    Rotary Evaporators Parts List

    You can learn the complete rotary evaporators parts list from this article.


    Rotary Evaporators Operating Guide

    You will get to know how to operate the rotary evaporators in quick time.


    Rotary Evaporators Trouble Shooting

    You will find practical ways to solve the common technical problems.


    Top50 Rotary Evaporator Manufacturers

    You can check list of Top 50 Rotary Evaporator Manufacturers from this post.


    Rotary Evaporators Installation Guide

    You can check how to install the rotary evaporators and do it by yourself.


    Rotary Evaporators Maintain Guide

    You will know the ways to maintain your rotary evaporators in this guide.

    Trusted, Certified Rotary Vacuum Evaporator Suppliers

    As a professional vacuum rotary evaporator maker, our patented technologies and certifications ensure our high-quality products are widely recognized by customers.

    Rotary Evaporators Complete Guide

    What Is Rotary Evaporator History?


    In the ancient Greek era in 350 BC, Aristotle studied the principles of distillation and condensation, discovered the important water cycle in nature.

    Seawater can be made drinkable by distillation, which turns water into steam and then into a liquid.

    In the 17th century, Irish physicist Robert Boyle carried out the revolutionary vacuum distillation, which proved the relationship between pressure and boiling point, and the distillation speed was significantly improved.

    In the 1950s, scientists C.C.Draig and M.E.Volk proposed the concept of rotating flasks to achieve better mixing and larger area heating of samples. At the same time, the earliest commercial rotary evaporator was born.

    What Is Rotary Evaporator For Sale Disadvantage?


    Boiling of certain samples, such as ethanol and water, will result in loss of samples collected by the experimenter.

    The solution?

    In operation, boiling can usually be prevented by carefully adjusting the working intensity of the vacuum pump.

    You can also add Boil-proof particles to the sample to avoid boiling.

    You can use special condenser tube to the rotary evaporator for samples that are particularly difficult to distill, including samples that are prone to foaming.

    Why To Use Rotary Evaporator?


    Rotary evaporators are used for fast and gentle distillation of most samples.

    Due to the centripetal force and friction between the liquid sample and the evaporating flask, the liquid sample can form a liquid film on the inner surface of the evaporating flask, increasing the heating area.

    The force generated by the sample rotation effectively suppresses the boiling of the sample.

    Factors Affecting the Evaporation Rate of Rotary Evaporator


    If you just buy a rotary evaporator for sale and want to know how to effectively improve its working result, you can follow the below steps.

    • Temperature of water bath. The temperature of the water bath should not exceed 30 degrees.
    • Vacuum in the Rotary Evaporator. The vacuum pressure should not be too high. Once there are signs of spraying, open the vacuum valve immediately.
    • Condensation recovery unit efficiency.
    • Rotation speed of the spinner. Water mist appeared outside the flask, and then gradually increased.

    What is Rotary Evaporator For Sale Application?

    • University laboratory, commonly used for separation of solvents, concentration and drying of composites, distillation of water, etc.
    • Biomedicine, separation and purification, concentration and drying of pharmaceutical liquids, etc., can be used with recirculating chillers and vacuum pumps.
    • Petrochemical industry, solvent recycling, vacuum distillation of high boiling point substances, etc.
    • Cosmetics, essential oil extraction, low temperature separation, emulsification under reduced pressure, etc.


    How To Maintain Rotary Evaporator for Sale?



    Rotary Evaporator is used many times in the laboratory.

    You need to clean and maintain it to keep it in good status.

    Safety Precautions for Cleaning the Glass of the Rotary Evaporator For Sale

    You can washed rotavap glassware with 0.5% detergent first, then washed with tap water, and then soaked in 1%~2% hydrochloric acid solution at least four hours.

    Rinse again with tap water, and finally rinse with deionized water two to three times, and put it on a rack for later use.

    For used instruments, first wash with tap water until there is no dirt, then wash with decontamination powder or lotion.

    Rinse again with tap water, and finally rinse with deionized water two to three times, and put it on a rack for later use.

    The standard of cleaning rotary evaporator glass is that water droplets should not be suspended inside and outside the container, and the inner wall should be evenly wetted with a thin layer of water.

    How To Avoid Rotary Evaporator For Sale Spray?

    • The temperature should not be too high, and the temperature of the water bath should not exceed 30 degrees Celsius.
    • Don’t pack too much on the rotary evaporator for sale. If it is a low boiling point solvent, you can consider adjusting the vacuum degree slowly without heating.
    • Replace the rotary evaporator recycling bottle with a relatively large capacity. Generally, the smaller the capacity of the recycling bottle, the easier it is to bump.
    • The rotary evaporator vacuum pressure should not be too high. People should not leave during the rotary steaming process. Always pay attention to it. Once there are traces of spraying like opening the vacuum valve immediately.
    • The solvent with low boiling point and easy to bump and spray can be properly vented and pressurized by operating the rotary steam vent with fingers.
    • Spin DCM outside the water bath until water mist appears outside the flask, and then gradually decrease and gradually increase water bath contact volume until stable without bumping.
    • Use the anti-boil ball of anti-shock material, which can be poured back after spraying. This needs to ensure explosion-proof the balls are clean, so wash them before each use.

    How To Set Suitable Temperature on Rotary Evaporator For Sale?


    Here is the truth:

    Rotary evaporator is usually connect to the chillers and vacuum pump in reaction process.

    In order to fully condense the vapor, the temperature of the cooling circulator should be set to about 20°C below the vapor temperature for rotary evaporator.

    For example:

    A solvent vapor temperature of 30°C is generated at a bath temperature of 50°C, followed by condensation at 10°C.


    What To Do If the Rotary Evaporator Bottle Falls Into the Pot During Rotary Steaming?



    In most cases, rotary evaporator spinner bottle will not fall during running.

    But what to do if the spinning bottle fall into the pot?

    Here is the solution:

    If methylene chloride is fall out of the pot, quickly turn off the heat and move the rotary evaporator water bath to a fume hood.

    Due to the low boiling point of dichloromethane, if the temperature of the water is greater than 40 ℃, the dichloromethane will continue to boil, and it is recommended to add a small amount of ice to cool down.

    After the temperature has dropped, tilt the pot and use a dropper to suck out the methylene chloride.

    If a solvent with a density less than water, such as ethyl acetate, is dropped from the pot, directly scoop out the upper solvent with a small measuring cup.

    Water-soluble solvents, such as alcohols, if the product is insoluble in water and directly precipitated, just filter is ok.

    How to Use Rotary Evaporator in Pharmaceutical Indubstry?


    Here is the truth:

    Rotary evaporator is a useful instrument in pharma industry.

    Rotary evaporator is one of the indispensable experimental instruments for drug extraction.

    So how to use it in pharma manufacturing process?

    Here we list the main steps for reference.

    Make Rotary Evaporator Inspection Before Use

    Check whether the rotary evaporator has the clean sign and the equipment intact sign.

    if there is no clean sign or if the equipment is out of service, the rotary evaporator must not be used.

    Check whether the rubber tube used for vacuuming is aging: check whether all the dosing cocks are closed.

    Use of Rotary Evaporator

    Use the water bath lifting handwheel to lower the water bath, install the evaporating flask, and then use the water bath lifting handwheel to raise the water bath.

    Turn on the condensed water, open the vacuum pump valve, and check whether the index of the vacuum gauge is within the specified range.

    Rotating the material and turn the cock into an open state.

    Use a rubber tube to pump in the material liquid and you shoud note the amount of material liquid should not exceed half of the capacity of the rotary evaporation bottle.

    After the material is pumped, close the material extraction port.

    Adjust the bath to an appropriate height, usually by rotating the bottle immerse 1/2~1/3 is appropriate.

    The height of the water (oil) bath can balance the weight of the rotating bottle with buoyancy.

    Press the rotation start button to start the rotation and adjust the knob from slow to fast.

    Adjust the temperature to the required temperature.

    Rotate the valve of the large collection bottle & the condenser connected to the large collection bottle, so that the evaporated solvent flows into the bottle.

    When the large collection bottle is almost full, close the compound valve and open the small collection bottle.

    The compound valve of the collection bottle connects the condenser with another small collection bottle.

    At the same time, open the auxiliary valve in the compound valve on the large collection bottle.

    After the large collection bottle is emptied, open the rotary evaporator discharge valve and release the collection liquid.

    Large and small collection bottles can be used alternately to ensure continuous operation.

    The rotary evaporator can be continuously fed through rotating the feeding cock to open it and pump it in with a rubber tube.

    After the evaporation is completed, turn off the heating key and vacuum pump.

    Use the water bath lifting handwheel to lower the water bath and remove the rotary bottle, or pass the PTFE tube through the small hole on the distillation bottle.

    Use negative pressure to suck the solution in it out and avoid frequent disassembly of the rotating bottle.

    Rotary Evaporator Cleaning

    After using the rotary evaporator, wipe the interface of the rotary evaporator with purified water with a clean cloth.

    According to the evaporator operation procedure, rinse the rotary evaporator with water repeatedly until there is no residue and use a suction bottle to extract the residual liquid in the evaporation bottle.

    Turn off the vacuum and scrub the outside of the rotary evaporator clean with purified water.

    Seal all the mouths with plastic bags, hang up the cleaning signs, and set aside.

    If rotary evaporator is found damaged or malfunctioning, you should immediately notify the maintenance personnel to replace it.

    What is Rotary Evaporator Usage Experience?


    Rotary evaporators are commonly and conveniently used to separate “low boiling point” solvents, such as n-hexane or ethyl acetate, from compounds that are solid at room temperature and atmospheric pressure.

    Now let’s learn about the experience of rotating evaporator:

    During the use of the equipment, the water in the water bath, the water in the water pump and the whole device must be kept clean.

    1. In the use of rotary evaporation, high temperature silicone grease is used between the rotary bottle and the rotary evaporator, and the grinding bottle is connected with the main body, and equipped with plastic standard mouth clips.
    2. In the use of rotary evaporation, if there is a power failure, the water in the water pump will be poured back into the rotary evaporation system.
    3. In the process of rotary evaporation, if the boiling point of the solvent is low, it is easy to appear in the process of rotary evaporation. The rotary evaporation liquid in the rotary evaporation bottle will rush into the condensing tube, and then enter the liquid receiving bottle.

    Rotary evaporators are mainly used for concentration, crystallization, drying, separation and solvent recovery in the pharmaceutical, chemical and biopharmaceutical industries.

    Compared with atmospheric distillation, the rotary evaporation rate is faster under negative pressure. If some samples cannot withstand high temperature, they can be carried out at normal temperature.

    The distillation flask of the rotary evaporator can be a pear-shaped or round-bottomed flask with a standard ground mouth, connected to a vacuum pump through a high reflux serpentine condenser.

    The other opening of the reflux condenser is connected to a receiving flask with a grinding mouth for receiving the evaporated organic solvent.

    There is a three-way piston between the condenser tube and the decompression pump. When the system is connected to the atmosphere, the distillation flask and the liquid contact flask can be removed to transfer the solvent.

    When the system is connected to the decompression pump, the system should be in a decompressed state.

    You should be careful that there are two external connectors on the condenser for cooling water, one is connected to the water, and the other is connected to the water.

    Rotary evaporator condenser tube plays an important role in the evaporation process.

    The rotary evaporation is carried out under the constant temperature control of the liquid, and the evaporated gas is returned to the condensing device, converted into liquid after constant temperature cooling, and finally returned to the recovery bottle.

    The condensing bottle device is an important step in the conversion of gas to liquid.

    If there is a problem with the condensing bottle device, it will directly affect the purity of the liquid in the final recovery.


    Here is the truth:

    Distillation is a way to separate different materials based on their unique characteristics and it is suitable for destroy sensitive molecules by polymerization or by thermal cleavage.

    Distillation is fit for herbs organic extraction. 

    As herbal extracts are heat sensitive, they are usually distilled in the rotary evaporator.

    There is usually only one solvent in herbal extraction.

    The problem is:

    The boiling point of the solvent is above or close to the coolant outlet temperature.

    This results in poor solvent recovery and damage to the vacuum source and the environment.

    The solution to this problem is to apply a vacuum controller so that the solvent boils 20-30 degrees above the coolant outlet temperature.

    Vacuum controllers can also be interconnected with process parameters and time for applications other than distillation.



    Explosion-proof rotary evaporator is designed for sensitive conditions to make theevaporation, distillation and separation of chemical experiments.

    It use a large-capacity and large-diameter rotary evaporator bottle to increase the evaporation area, place it in a water bath under reduced pressure, and heat while rotating to make the solution diffuse and evaporate efficiently.

    Feature of Explosion-proof Rotary Evaporator

    • Unique sealing structure and selected sealing materials, strong corrosion resistance.
    • High evaporation efficiency and high recovery rate.
    • Easy assembly, disassembly, operation and maintenance.
    • Stainless steel chassis, column and vertical shaft, beautiful appearance, corrosion resistance.
    • Main structure: Made of high-quality steel and 304 stainless steel, the appearance is fully sprayed to further improve and improve the reasonable performance of the instrument.
    • No spark, longer service lifetime.


    How to Choose the Right Cooling Circulating Water Bath for Your Rotavap



    Choosing the right cooling method for your evaporation experiment can have an incredible impact on overall system performance and efficiency.

    Here is the question:

    How to choose suitable cooling circulating water bath?

    we list the follwing factors for reference.

    Minimum condensing temperature and corresponding cooling capacity

    The minimum temperature of the cooling circulating water bath needs to be equal to or lower than the temperature at which the rotary evaporator condenses the solvent vapor at the optimum rate.

    The cooling effect of the cooling circulating water bath needs to comprehensively consider the two parameters of temperature and cooling capacity.

    If the condenser is required to work at lower temperatures, it is necessary to have an in-depth understanding of the cooling capacity of the cooling circulating water bath at lower temperatures.

    If the rotary evaporator needs to distill multiple solvents, the power of the cooling circulating water bath should be selected according to the minimum condensation temperature required.

    How to use water bath on rotavap for sale?



    When you use a rotary evaporator to evaporate the material, the most important thing is to heat it at a constant temperature with a water bath.

    Next, we will tell you about some precautions when using a rotavap water bath.

    • Before starting the test, raise the spinin in the sample to a high point.
    • Please set the rotary evaporator water bath in the middle position of the sample bottle moving up and down.
    • Place the sample bottle in the water bath of the rotary evaporator, and add water to the rotary evaporator bath according to the capacity of the sample bottle, but be careful not to add too much water, generally add it to 2cm away from the edge of the pot.
    • After confirming that the power switch of the water bath of the rotary evaporator and the power switch of the instrument host are turned off, insert the power plug into the socket.
    • Lower the sample bottle of the rotary evaporator to the lower position.
    • Do not splash water into the electrical box to avoid leakage and damage to the electrical box.
    • If it is found that the indicator light is not on, turn off the power first, unplug the plug and then disassemble the meter to check. If the fuse or bulb is damaged, it can be replaced according to the same specifications.
    • The internal surfaces of the equipment should be free of water beads, and the external surfaces should be bright, neat and free of smudges.
    • When using the water bath, it must be grounded reliably, and the water cannot overflow into the control box.

    The difference between rotary evaporation, vacuum distillation, parallel evaporation and rectification



    Liquid concentration or purification methods commonly used in laboratories are usually rotary evaporation, vacuum distillation, parallel evaporation, and rectification.

    Rotary Evaporation

    It is usually used for the evaporation of common solvents, such as methanol, acetonitrile and other substances.

    Because in chemical experiments, especially in the synthesis of organic compounds, most of the reactants are first dissolved in the solvent, and various reactants are reacted with each other by steps such as heating and stirring. After the reaction is completed, the solvent Distillation is required, so a rotary evaporator is required.

    Most laboratory rotary evaporators are equipped with circulating water pumps.

    Vacuum Distillation

    Rotary evaporation can also be regarded as a kind of vacuum distillation.

    It usually use a rotary vane vacuum pump. At present, in order to improve the resistance to chemical corrosion, there are also applications of hybrid pumps and screw vacuum pump.

    Parallel Evaporation

    It is usually used for high-throughput screening in organic synthesis processes to improve the efficiency of screening.

    Equivalent to multiple rotary evaporators working at the same time.

    The final solvent evaporation efficiency depends on the heating temperature and vacuum.


    Rectification is usually the separation of substances with a high boiling point and a similar boiling point, and what needs to be obtained is the distilled substance.

    Rectification mainly examines data such as heating temperature, stirring speed, packing, reflux ratio, vacuum degree, etc., and obtains a set of optimal combinations. Usually a vacuum pump less than 1mbar is required.

    How to use the rotary evaporator safely?


    Vacuum Degree of Rotary Evaporator

    Vacuum degree is the most important process parameter of rotary evaporator, and users often encounter the problem of vacuum degree, which is often related to the nature of the solvent used.

    However, general vacuum cannot withstand strong organic solvents, so special vacuum pumps with strong corrosion resistance can be selected first.

    Rotary Evaporator Motor Temperature

    Continuous use of the motor surface temperature rise does not exceed 45 ℃ is normal and can be used with confidence.

    If the temperature rise exceeds 45°C, check the relevant transmission lubrication system.

    If the ambient temperature is very high, the water bath temperature is also very high, and the user can use a fan to cool it.

    Routine Maintenance and Cleaning

    • Clean the glass ground joints weekly with ethanol and apply vacuum silicone grease.
    • Check seal wear quarterly.
    • Disconnect the power supply when cleaning and maintaining the instrument. Use a surfactant-based cleaner or use isopropyl alcohol to clean inert stains.

    How to Install the rotary evaporator For Sale?


    The rotary evaporator consists of three parts: the mechanical part, the glass part and the constant temperature water bath.

    Installation of rotary evaporator for sale is very convenient, the specific procedures are as follows:

    • Put the rotary evaporator rack on a firm workbench close to the water source and place four hard rubber feet in case of unevenness.
    • Move the center of the machine head to a height of 50cm from the chassis and tilt it about 25 degrees to the right to lock the fixed top wire on the machine head on the frame.
    • Fix the electric control box according to the picture, and plug in the five-core plug of the motor.
    • Insert the condenser on the interface of the machine head, adjust the movable joints to make the condenser vertical, and keep it with the fixing clip. The condenser pipe joints are rearward.
    • Put the feeding valve on the PTFE tube in the accessories and insert the condenser tube.
    • Connect the collection bottle to the condenser tube and clamp it with the bottle clamp.
    • Put the rotating bottle on the right end of the rotating shaft and clamp it with the bottle clamp.
    • Place the water bath under the spinner bottle and add clean water to 2/3 of the pot.
    • Connect the vacuum tube connector with the vacuum tube at the suction tube, and connect the other connector to the vacuum pump or laboratory vacuum switch.

    The above is the whole installtion process and you can follow it to install your rotavap.

    What to Consider when purchasing rotary evaporator for sale?


    Air Tightness of The Rotary Evaporator System


    Air tightness is very important for the rotavap for sale quality.

    You need to check whether the system can maintain a high degree of vacuum in the state of motion under the erosion of various solvents.

    Rotary Evaporator for Sale Lifting Method

    Generally, the more complex lifting structure, the rotavap price will be more expensive.

    The main unit of 1L, 2L and 5L rotary evaporator for sale is lift available, and you can lift the water bath for rotavap capacity above 5L.

    Rotary Evaporator For Sale Model Selection

    Here is the truth:

    1L, 2L, 3L, 5L rotavap machines are suitable for laboratory and small sample tests.

    5L, 10L, 20L rotary evaporator are suitable for pilot test.

    20L and 50L rotary evaporator for sale are suitable for pilot test and production, especially for the extraction of materials that need to avoid metal ion contamination.

    What is the rotary evaporator extra application?



    Most people think rotavap is the same with the glass reactor and  vacuum pump.

    Generally, Rrotary evaporator is used in the chemical laboratory.

    We will introduce you to the additional applications of the rotary evaporator.

    Rotary Evaporator For Sale Applied in Hotel Kitchen

    Now many hotel chefs use rotary evaporator to evaporate part of the water in the fruit juice to make the juice drink more rich and pure.

    Compared with the juice made with additives, the taste is not bad at all, but it is fresher and healthier.

    Even when making cakes, adding vegetable juice to the cake embryo, fresh cream and white chocolate is too thin, we will use our rotary steamer to make the vegetable juice thicker and more perfectly integrated into the cake.

    Rotary Evaporator For Sale Applied in Cosmetics Company Research and Development


    Most cosmeceuticals are based on traditional Chinese medicine.

    Of course, the drug in it cannot be in solid form.

    Therefore, a very important step when making cosmeceuticals is to dissolve the drug so that the consistency of the cosmetic and the drug is the same, and that the Tyndall effect will not occur between the two.

    Therefore, it is necessary to use a rotary evaporator to continuously experiment with different water contents for titration and reconciliation.

    Rotary Evaporator For Sale Applied in Drug Research and Development

    Every pharmacy laboratory and production room basically has a rotary evaporator to do the experiment.

    Rotary evaporators are almost used more frequently in the preparation of pharmaceuticals than in chemical laboratories.

    Rotary Evaporator For Sale Applied in Water Quality Testing

    The detection of water is basically to detect the total dissolved solid value in the water, that is, to detect the total amount of various organic or inorganic substances dissolved in the water.

    If the impurities in the water to be analyzed are limited and uncertain, the use of the rotary evaporator is reflected.

    You can use rotary evaporator to evaporate most of the clean water and you can calculate the quality of impurities.

    What to do if The vacuum of the rotary evaporator cannot be lowered



    Rotary evaporator is a kind of experimental equipment that can carry out negative pressure and atmospheric distillation, and the whole machine has good sealing performance.

    But sometimes there is a situation where the vacuum cannot be pumped up.

    Today, we will briefly summarize some solutions on the vacuum cannot be lowered.

    There is solvent in the rotary evaporator container

    Because it is limited by the saturated vapor pressure, the degree of vacuum cannot be reduced.

    You need to clean up the container and try again.

    Water Circulating Vacuum Pump Failure

    If there is something wrong with the Water Circulating Vacuum Pump, you need to first replace the circulating water of the vacuum pump.

    If the problem is not solved, we need to clean and check the circulating water vacuum pump.

    The pipe connecting the vacuum pump to the rotary evaporator is loose

    The vacuum degree caused by the loose joint cannot be lowered.

    You just need to tighten the connection and joint.

    There is a foreign body blockage inside the discharge valve

    If there is foreign body blockage in the radiotherapy valve or pressure control valve and damage to the glass wool sandwich panel, the vacuum degree will not be lowered.

    You need to detect and find the foreign body blockage reason and solve it.

    The sealing ring of rotary evaporator for sale is corroded

    If the sealing ring has not been replaced for a long time, it may be corroded, which will reduce the overall sealing performance of the equipment.

    You need to inspect and maintain the sealing ring of rotavap regularly.

    How to Get the Best Rotary Evaporation Results


    If you are dealing with a large volume or are running multiple evaporations, you need the process to run as fast as possible.

    Here is the recommed method.

    • Increase your reaction size. Creating a larger surface area inside the flask will provide faster heating and more efficient evaporation.
    • Raise the temperature of the bathtub. Increasing the bath temperature will definitely increase the evaporation rate. However, be careful not to overheat the reaction.
    • Increase the rotation speed. Faster spin speeds allow more fluid to mix and increase the surface area inside the flask.
    • Increase vacuum. Increasing the vacuum within the system will lower the boiling point of the solvent and speed up evaporation.
    • Use additional drying equipment. Depending on your sample, a freeze dryer, vacuum dryer or laboratory oven can be used to completely dry the sample.

    What To do if the splash-proof ball cant be removed from the rotary evaporator?


    The anti-splash ball is a commonly used supporting glass instrument for rotary evaporators and sometimes it cannot be removed.

    Failure to remove is usually caused by the lack of vacuum silicone grease or by the sample sticking to the interface.

    We advise following ways to solve this problem.

    Shake Rotary Evaporator Anti-Splash Ball

    If it is not very tight, you can put on canvas gloves shake it horizontally and forcefully to see if it can be removed.

    Tap Rotary Evaporator Anti-Splash Ball

    Find a plastic bottle that is common in the laboratory, extend toward the anti-splash ball.

    Go around the edge of the anti-splash ball interface, tap the anti-splash ball with a small force, and connect the anti-splash ball with your hand to prevent it from falling and breaking.

    If it doesn’t work, don’t hit it with too much force to prevent the glass shaft of the rotary evaporator from being broken.

    Froze Rotary Evaporator Anti-Splash Ball

    Take off the anti-splash ball together with the glass shaft and put it in a dry ice ethanol bath for 2~3 minutes.

    Take it out, rinse off the ethanol with water first and quickly bake the interface with the hot air gun.

    If it does not open, repeat this operation.

    How does the rotary evaporator do the distillation purification experiment


    Rotary evaporator is a kind of equipment commonly used in laboratories for evaporation, concentration and purification operations.

    It can be used for small-scale, pilot-scale and production in the fields of biology, medicine, chemical industry, and food.

    So how does the rotary evaporator perform distillation and purification?

    Here we introduce the distillation and purification with rotavap briefly.

    The rotary evaporator is heated at a constant temperature and rotated under the condition of reduced and negative pressure to form a thin film to continuously evaporate a large amount of volatile solvent, evaporate, and then condense and recover the solvent to achieve the effect of purification and separation.

    That is, under reduced pressure, when the solvent is distilled, the distillation flask is continuously rotating.

    As a heat source for distillation, the rotary evaporator can be combined with Water Circulating Vacuum Pump, diaphragm vacuum pump, Recirculating Chiller and Refrigerated Heating Circulator to form a system device.

    When using rotary evaporator, it should be noted that the glass parts should be handled with care, and should be washed, dried or dried before installation.

    Each grinding port, sealing surface sealing ring and joint need to be coated with a layer of vacuum grease before installation.

    How to Avoid Bumping in Rotary Evaporator Distillation


    The core of avoiding rotavap bumping is the precise control of the vacuum condition of the system.

    At present, some rotary evaporators do not have a built-in vacuum control system.

    Generally, it is recommended to choose an electronic vacuum controller for vacuum control of the rotary evaporation system.

    Electronic lift and vacuum controller with built-in vacuum sensor, regulating valve and exhaust valve, the vacuum system can be easily upgraded to electronic control, making the whole distillation process more efficient.

    It can effectively avoid the situation of sample bumping and punching, and it is the best choice for economical digital vacuum control.

    How to choose the distillation method of rotary evaporator

    Core Components of a Rotary Evaporator

    Are you wondering when to choose atmospheric distillation and when to choose vacuum distillation for rotary evaporator?


    The question of atmospheric distillation or vacuum distillation is not only about the rotary evaporator.

    For low boiling points and stable chemical properties, atmospheric pressure is enough, no need to reduce pressure.

    Vacuum distillation is used for the distillation of substances with high boiling points, difficult volatilization, and unstable high temperature properties.

    As for the rotary evaporator, there is an additional function of rotation, which can make the liquid adhere to the inner wall of the flask, increase the evaporation area and improve the evaporation efficiency.

    As for whether to use normal pressure or reduced pressure, it depends on the stability of material properties.

    Substances with stable performance and low boiling point can be tested at normal pressure.

    On the contrary, for non-volatile substances with higher boiling points, vacuum distillation should be used, and the speed of vacuum distillation is generally faster than that of normal pressure.

    Why rotary evaporator use high borosilicate glass


    Many people ask why rotary evaporator use high borosilicate glass for the glassware.


    The main components of high borosilicate glass are boron oxide, silicon dioxide and sodium oxide, etc.

    The content of boron silicon is relatively high, with boron accounting for 12.5%-13.5% and silicon accounting for 78%-80%.

    High borosilicate glass thermal expansion coefficient can reach 3.3 while ordinary glass is 5.8-150, so high borosilicate glass has stronger fracture resistance.

    The high borosilicate glass has higher heat resistance, the strain temperature can reach 520℃ and the temperature difference it can withstand can reach about 150℃.

    During the development of the experiment, the condition is usually below zero or high temperature such as hundred degrees Celsius.

    This greatly increases the safety risk. It is not allowed to use tempered or ordinary glass.

    High borosilicate glass has stable molecular properties and is not easy to chemically react with materials.

    Compared with tempered glass and ordinary glass, the High borosilicate glass has higher transparency and make the project process clearer and brighter.

    When the rotary evaporator is working, the heating temperature of the heating bath to the rotary bottle can reach 200 ℃.

    The condensing coil cools and condenses the material vapor through the refrigerant in the recirculating chiller.

    High borosilicate glass of rotary evaporator must be used to ensure the smooth progress of the whole project.

    When to choose atmospheric or vacuum distillation for rotary evaporator?


    You might purchase rotavap for sale from manufactuer.

    But you still not sure when to use atmospheric or vacuum distillation for rotary evaporator.

    Actually, here is the method to help you decide to use which distillation type.


    The question of atmospheric distillation or vacuum distillation is not only about the rotary evaporator.

    For low boiling points and stable chemical properties, atmospheric pressure is enough, no need to reduce pressure.

    Vacuum distillation is suitable for the distillation of substances with high boiling point, non-volatile, unstable high temperature properties, etc.

    As for whether to use normal pressure or reduced pressure, it depends on the stability of material properties.

    Substances with stable performance and low boiling point can be tested at normal pressure.

    On the contrary, for non-volatile substances with higher boiling points, vacuum distillation should be used, and the speed of vacuum distillation is generally faster than that of normal pressure.

    What to do if there is no vacuum for rotary evaporator operation?



    Vacuum is an integral part of the rotary evaporation process and the ability to quickly and effectively identify any pressure-related issues will help you run more efficient processes and minimize downtime.

    During usage, you should make sure the system is working well and maintain a normal vacuum.

    The question is:

    What to do if there is no vacuum during the rotavap operation?

    Here we list the main solution for reference.

    Check the rotary evaporator system maintains a vacuum without liquid.

    In theory this should be a closed system with no way to generate additional gas through evaporation.

    If the system is off and the pump is working properly, it should reach the pump’s high vacuum/low pressure relatively quickly.

    If not, the integrity of the pump needs to be checked.

    You can disconnect the pump and use the vacuum gauge directly on the pump with a closed wire and see how it works.

    If there is no possibility of adding air to the system (e.g. through leaking fittings or connections), the vacuum pump should be able to quickly reach its high vacuum/low pressure.

    Check the rotary evaporator system for leaks

    Leaks may also occur at the seal where the condenser is connected to the rotary evaporator body near the upper end of the steam pipe.

    Users can listen for leaks by placing their ears near the glass joints and connections.

    But many times the vacuum pump is so loud that small leaks may not be detected this way. Remove and reconnect all connectors and connections.

    After completing the above checks, if the pump is in good working order and the user cannot find any leaks, but the system still does not maintain a consistent vacuum during the evaporation process, in this case the user can check the conditions of the evaporated solvent.

    In addition to the need to pay attention to the vacuum problem, the daily maintenance and maintenance of the rotary evaporator is very important.

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