Rotary evaporators, commonly known as rotavapors, rotavaps or rotovaps, are extremely valuable to a number of downstream applications requiring efficient distillation & solvent removal. Often combined with a vacuum pump, rotary evaporators are used to remove solvents from samples through evaporation. During this process, rotary evaporators reduce the pressure within the system to lower the solvent boiling point, rotate the sample to increase the effective surface area, and heat up the solution.

Because of this technique’s distillation efficiency, most users prefer rotary evaporators over standard distillation systems. Not to mention, rotary evaporators ensure samples receive more even and consistent heating from a heated liquid without overheating the samples. Rotary evaporation involves a multitude of sample concentration or liquid extraction techniques from solvent reclamation, chromatography fractions, solvent removal procedures, trapping of hazardous waste liquids, and separation of non-volatile solutes from volatile solvents. Which is why rotary evaporators are a vital and staple instrument to numerous research and chemical laboratories. These instruments are also common within molecular gastronomy, organic chemistry, and petrochemical industries.

Moreover, a rotary evaporator is also a popular instrument in medicinal plant research, cultivation, and extraction. This instrument paves the way for economical ethanol recovery & extraction to create butane hash oil and other concentrates.

The rotary evaporators with motor lift are equipped with a manual motor lift-up which enables you to control the process in case of a power outage. They come with different flask capacities which range from 2 liters to 50 liters or more. Managing the entire process is made easy with the digital LCD screen that enables one to view the evaporation process and make necessary changes.

The locking position on this evaporator is adjustable to different directions, especially if one is using different sizes of the flasks, or if one needs to move the vacuum seal from the contact position. You can quickly move the motor with switch operation. All these rotaries are made with glass condensers which prevent the liquids from stagnating and thus, improve the cooling process.

Rotary evaporator with hand lift is a manual evaporator which you get to control the motor function using the hand. These devices are equipped with an LCD for easy monitoring of the evaporation process. The heating bath is made of stainless steel material that does not corrode easily. This rotatory has a durable rubber seal made of polytetrafluoroethylene to keep the vacuum tightly sealed.

It also utilizes the dual-layer cooling to ensure an improved and efficient condenser performance. It comes with a digital heating bath that provides even temperatures as needed. Always make sure to clean up the glass parts before setting the device up for use.

If you are looking for a Lab rotary evaporator to use in different fields, the above are top best to consider. They are made distinct features that make them ideal for use in various industries such as beauty, pharmaceutical and even in higher learning institutes.

Rotary evaporators are the leading devices used in chemical reactions for the removal of the solvents. They come in different sizes and features to fit various projects. For example, if you are working on a large project that involves major working chemicals, you may need to consider a large-sized rotary device. The sizes are measured in liter capacity, which ranges from as low as 2 liters to 50 liters.

Other than removing the solvents, this equipment can also be used for the removal of molecules. This evaporator equipment of 2L works under various circumstances such as low or high pressure to give efficient results.

This equipment is equipped with a 2-liter flask and an extra 1-liter flask which is suitable for collecting the finished product. The rotating speed occurs from 0 to 120 R/min based on the product that you are working on, while the evaporation speed occurs from 1.5 to H20. This equipment has a powerful motor that ensures it works efficiently with a temperature range of RT-99 degree Celcius to -299 degree Celcius.

5L rotary evaporator has evaporating power which makes it suitable for large industries applications. It is highly used in chemical industries, pharmaceutical industries and also higher institution learning.

The device adopts the flask enlarge, which works under reduced pressure to ensure the solution in the bottle defuses for the efficient evaporation process. It is equipped with a water bath which continually heats up while the flask rotates in it. This rotary is suitable for use with concentrated, drying and recycled materials since it has functional parts. It has an effective temperature range control of -99 degree Celcius and the rotary bottle is 5 liters for efficient collection of chemicals.

10L rotary evaporator is a perfect example of the best device for distillation and other extraction devices. It is equipped with a sturdy working device that enables it to remove all the solvents and molecules from the chemicals.

This rotary model has a 10-liter capacity, which consists of two collection flask each measuring 5 liters. The motor is quite powerful since it functions at 120 W, plus the rotating speed range from 0 to 140 rmp depending on the distilled substance. The device has a heating bath which has a speed rate of 3KW and two coiled condensers for the effective distillation process.

20L rotary evaporator has a wide range of applications in various industries such as food, beauty industries, and even medical industries. It has high evaporation power and large storage capacity, which suits large application jobs.

20L rotary evaporator comes with an additional flask with measures about 5 liters. The motor is quite powerful, making it possible to evaporate chemicals under low and high speed/pressure. The rotating speed range from 0 to 120 w. The heating bath has a temperature rate of 5KW while the temperature controlling range at 200 degrees Celcius.

50L rotary evaporator is the top best and large rotary evaporating device useful in various industrial applications. The evaporator is used in distilling and separating chemicals. The rotary comes with a water circulating vacuum pump and circulating chiller to ensure the production condition is reliable.

The 50-liter evaporator comes with four receiving flasks with each measuring capacity of 5 liters. The temperatures range of -99 degrees Celcius. The motor works under a high power of 250 W, which in return enables the equipment to operate under high and low pressure. The condensers are made with two vertical coils for ample sealing of the pipes.

The above reviews are the top best rotary evaporators essential for use in different industrial manufacturing of chemicals. These rotary evaporators come in different sizes to carry out small ad extensive evaporation experiments. Check out the available pats and the features when selecting the right evaporator for your project.

As one of the best rotary evaporator manufacturers, LabSnova is professional and experienced in producing experiment equipment, and we are always committed to providing our customers with the best service and products. On the one hand, we have professional teams with experienced engineers and highly-trained workers; and on the other hand, we have well-equipped factories for manufacturing equipment in accordance with customers’ meets. Additionally, the kinds of WKIE Lab equipment are various; from rotovapor to molecular distillation, you can always find the one you need, From the construction to now, our equipment has been sold to more than 50 countries, and have won high praise and good reputation from clients.

For more information on rotary evaporators for sale, just contact us and we will provide top quality product and services for you wholeheartedly.

• Saves Energy

Its topmost advantage is that it saves a great deal of energy. This is because it negates the need to heat the solution to the boiling point. Instead, it lowers the pressure of the fluid in such a way as to make its boiling point lower. For this reason, you will not have to dig you deep into your pocket to operate it.

• Faster

Compared to its closest rival, distillation, the rotary evaporator is faster. Indeed, it yields the desired ends within a shorter duration of time.

This cuts down the otherwise long wait times you have to put in to be able to enjoy the benefits that come along. The pleasure of convenience is hence yours to reap.

• Convenient Controls

In all, this tool is simple and easier to control. It does come equipped with a set of convenient controls for your use and leverage. You also need not possess huge expertise to be able to have your way in them at all. The beauty of this arrangement is that even a starter will find it easier to handle.

• Less Risky

Other than convenient controls, this equipment is also less risky than ordinary rivals and counterparts. It is fitted with tons of safety devices and features. These minimize explosions, overheating, short-circuits, and other likely dangers. Moreover, it does enjoy a relatively safe track record. You have all your safety and peace of mind guaranteed.

• Highly Effective

All said and done, the rotary evaporator is highly effective. It does the job of extracting solvents well and with minimal dangers and damages. You can never afford to look elsewhere as this equipment embodies all the traits and strong points that good equipment of this kind is ordinarily expected to.

Rotary evaporator is a kind of evaporation instrument, which is widely used in the chemical laboratory. It is suitable for reflux operation, rapid evaporation of a large number of solvents, concentration of trace components, and reaction processes that require stirring, especially for continuous distillation of large amounts of volatile solvents under reduced pressure.

Rotary evaporator, which is also called rotovap, is mainly a laboratory common equipment consisting of: motor, distillation flask, heating pot, condenser tube and other parts.

1. The evaporation flask is an eggplant-shaped or round-bottomed flask with a standard grinding mouth connection. The reflux serpentine condenser tube is connected to a pressure reducing pump.

2. There is a three-way piston between the condenser tube and the pressure reducing pump. When the system is connected with the atmosphere, the evaporation flask can be removed. What’s more, the solvent will be transferred. When the system is connected to the pressure reducing pump, the system should be under reduce pressure.

3. During the working process, the pressure should be reduced firstly, and then the motor should be turned to rotate the evaporation flask. In the end, the machine should be stopped and ventilated to prevent the distillation flask from falling off during rotation.

As the heat source for evaporation, a constant temperature water tank should be often provided. Through electronic control, the flask is rotated at a constant speed at the most suitable speed to increase the evaporation area. The evaporation flask was brought to a negative pressure state by a vacuum pump.

In short ,the principle of the rotary evaporator is electronically controlling the distillation flask to rotate at a constant speed at the optimum speed to increase the evaporation area.At the same time through the vacuum pump to make the evaporation flask in the state of negative pressure.　The evaporation flask was heated in a water bath while rotating at a constant temperature, and the solution in the bottle was subjected to heat diffusion evaporation in a rotating flask under a negative pressure.The evaporation system can be sealed to a pressure of 400 to 600 mm Hg; the solvent in the distillation flask can be heated by a heating bath to heat up to the boiling point of the solvent; and the rotation can be carried out at a speed of 50 to 160 rpm to form a solvent film. Increase the evaporation area. In addition, the hot vapor can be quickly liquefied by the high efficiency cooler to accelerate the evaporation rate. The above is the introduction of the working principle of the rotary evaporator.

1. Before operating the rotary evaporator, you must properly set it up. To do so, pour the sample into a round bottom flask. This flask should then connect to the evaporator’s bump trap using a Keck clip. Then, fill the rotary evaporator’s cold traps with dry ice. After doing so, attach the flask and bump trap to the adapter portion of the rotary evaporator and secure it with a Keck clip. This feature will prevent your solution from entering the main part of the rotary evaporator.
2. The last preparatory step is to lower the flask into the water bath using the joystick knob on the rotary evaporator. You should do this step once condensation begins to form on the flask’s exterior. Be sure to partially submerge the flask—approximately half-way—into the heat bath. It shouldn’t be so low that the joint with the Keck clip touches the water.
3. Now that everything is set up, activate the rotor. The speed of the rotor will depend on the volume of your sample. The rotor should spin quick enough that it creates an even coating of the sample on the surface of the flask.
4. Next, activate the vacuum pump. Slowly increase the vacuum to the proper strength. The sample will likely begin to boil. This should not cause concern unless the bubbles begin to reach the neck of the flask. If this occurs, re-pressurize the system by opening the stopcock fully. After the boiling has ceased, fully close the stopcock.
5. Close the stopcock on the evaporator. To do so, turn the stopcock perpendicular to the bleed valve.
6. Then, turn on the heat for the water bath.
7. Monitor the rotary evaporator for a few minutes. If there is no sign of bumping, it should be safe to leave the rotary evaporator unattended. However, you should continue to check in throughout the process periodically to ensure that nothing goes wrong.
8. Upon eliminating all the solvent, turn off the vacuum.
9. Then, turn the flask to atmospheric pressure and stop the rotation.
10. Lastly, raise the flask from the bath and remove the flask from the adapter. If it did not completely remove the solvent, add it back into the same flask and repeat the procedure.

How to Work Safely with Rotary Evaporators?

1. Wear lab coats, eye protection (safety glasses or goggles), closed-toes shoes, and appropriate gloves while operating the equipment.
2. Tie back long hair and do not wear loose items to avoid entanglement.
3. Ensure that the apparatus is maintained in a good working order. Seals should be checked periodically and replaced as necessary. Decrease in vacuum and leaking are generally indications that seals should be replaced.
4. Use a vacuum source that is appropriate for the level of vacuum needed. Diaphragm pumps are appropriate for most applications. Belt pumps and rotary vane pumps provide high levels of vacuum that can cause excessive bumping (i.e., flash boiling ofsolvent) and clog traps. Water aspirators should not be used as these can allow solvent vapors to enter drains and waste large volumes of water.
5. Check all glassware for visible chips, cracks or scratches before using. Handle glassware with care at all times.
6. Always use a cold trap in between the rotovap and the pump. Never use a liquid nitrogen to cool the trap as this can cause condensation of liquid oxygen. Empty the trap after each use. If a trap becomes clogged, immediately shut off the vacuum, disconnect the trap and ensure it is open to atmosphere to prevent
explosion. Allow the trap to thaw in a fume hood to empty.
7. Cool the receiving flask in a cold bath (typically ice water) and ensure that fluid used to cool the condenser is at a temperature appropriate for the solvent being removed. This will promote efficient collection of solvent and avoid overloading cold traps. Use chilled recirculators, or similar types of items, for supplying cooling fluid to the condenser to avoid wasting water.
8. Use a bump bulb (see picture) placed between your sample and the condenser to prevent contamination of the condenser area (and your sample) in the event of bumping. Remove and clean the bump bulb from the rotovap immediately after use to ensure ground glass joint connections do not stick together and to prevent contamination of future samples that will be rotovaped.
9. Always ensure that flasks, bump bulbs, and ground glass joint connections are secured to the unit with clamps or Keck clips, as appropriate.
10. Always keep organic solvents and residues away from the water baths and the electrical components. Change contaminated baths immediately.
11. Know the risks and properties of the chemicals you are working with. SDS sheets can be found through CEMS: https://cems.unh.edu/umass/CEMS/. Rotovaping of toxic items should only occur with appropriate local exhaust (i.e., in a fume hood, or in some cases, with a snorkel exhaust). Please contact EH&S if you have questions about the safety of your rotovap configuration for your application.
12. Rotovaps cannot be used for air and water-sensitive materials. Highly reactive materials should also not be rotovaped to prevent damage to seals. Distillation is a more appropriate choice for solvent removal for these items.

13. The water bath temperature should not exceed the boiling point of the solvent. Increase the temperature of the bath slowly to avoid bumping. Since a vacuum is A bump bulb usually applied to the setup, the boiling points of the solvents are going to be significantly lower than at ambient pressure .
14. Set the motor to start spinning slowly prior to applying vacuum to avoid bumping. Adjust the spinning speed once the vacuum is engaged to maximize surface area and prevent bumping.
15. Adjust the pressure to the minimum level needed to allow for efficient removal of solvent. Some units are equipped with devices to automatically control the pressure to a defined set point. For other units, pressure must be adjusted manually by using the vent stopcock located at the top of the condenser. For both types of units, the pressure should be monitored and adjusted, if necessary, throughout the process to avoid bumping.
16. Always empty the solvent collection flask of the unit immediately after use to prevent accidentally mixing of incompatible materials or unidentified waste.

How to stop the rotary evaporation process

After starting the process of rotary evaporation, there may be some instances in which you seek to stop the procedure. In this case, it is important to follow specific steps to prevent broken glassware, injury, ruining the sample, damaging the equipment, and other undesirable outcomes. The steps to halting the process of rotary evaporation are as follows:

1. Remove the flask from the heat bath using the joystick
2. Open the stopcock fully
3. Turn off the rotor
4. Turn off the vacuum source
5. Lift the flask from the water bath
6. Remove the flask from the adapter portion of the rotary evaporator
7. Turn the evaporator off completely

Rotary evaporator is a device for quickly concentrating liquid samples. The liquid sample is heated and decompressed in a spherical glass container, and continuously rotated to increase the evaporation surface area and accelerate the evaporation rate. Rotating evaporators are often used with water circulation vacuum pump.

Rotating evaporator is eggplant or round bottom rotating evaporator with a standard grinding port interface, which is connected to the water circulation vacuum pump through a high reflux serpentine condenser tube, and the other opening of the reflux condenser tube is connected to the receiving Rotating evaporator with a grinding port. It is often used to receive evaporated organic solvents.

There is a three-way piston between the condenser tube and the decompression pump. When the system is connected with the rotating evaporator, the solvent can be transferred easily. When the system is connected with the decompression pump, the system should be in a decompression state. When using, we should decompress first, then start the motor to rotate the rotating evaporator. In the end, we should stop first and then pass through the atmosphere to prevent the rotating evaporator from falling off in rotation. And Hawach rotating evaporator can be equipped with a temperature tank.

Rotating evaporator is often used for concentration, drying, crystallization, separation, and solvent recovery in the pharmaceutical, chemical, and biological pharmaceutical industries. We should consider the following factors when purchasing a rotating evaporator.

1. The core technology of rotating evaporator
Under the corrosion of various solvents and in the state of motion, whether the system can maintain high vacuum is the main criterion for measuring the rotating evaporator. It is sealed with Teflon material and glass, which can withstand various solvents and has a long-lasting and reliable airtightness. It can maintain high vacuum above -0.098MPa.

2. Factors affecting the efficiency of the rotating evaporator
For machines of the same specification, there are mainly steam temperature, vacuum degree, and cooling water temperature. Restricted by the heat resistance of certain materials, it is impossible to increase the steam temperature indefinitely during work, so high vacuum and low cooling water temperature are the two main factors for increasing the rate.

3. The difference between vertical condenser and inclined condenser
Because the vertical condenser has a small footprint, it has gradually become popular. Large-capacity rotating evaporator generally uses vertical condensers, but in essence, there is no difference between the two instruments.

4. Selection of Rotary Evaporator Model
2L, 3L, and 5L machines are suitable for laboratory and small sample tests; 5L, 10L, and 20L are suitable for pilot tests; 20L, 50L is suitable for pilot tests.

5. Rotating evaporator and other types of evaporator
The structure of the rotating evaporator is small and exquisite, compact, intuitive in work, and free of metal ion pollution. It is suitable for the extraction of precious materials in laboratories, production pilot tests.

6. The choice of water circulation vacuum pump
A water circulation vacuum pump resistant to corrosion by various solvents is recommended, which can be vacuumed to -0.098MPa, and can meet various requirements.

The following are the four major factors that affect the evaporation speed of the rotating evaporator.
1. The temperature of the water bath;
2. Rotation speed of sample bottle.
3. The degree of vacuum in the rotating evaporator;
4. Whether the condensation recovery unit is efficient.

If you need a rotary evaporator, take a look at the extensive array of laboratory products offered at Labsnova Equipment. Labsnova Equipment is a leading provider of new and used laboratory equipment available at incredible prices. We offer 2-, 5-, 10-, 20-, and 50-liter rotary evaporators. Our wide variety of high-quality equipment also includes chillers, heaters, cold traps, extraction units, filtration devices, glassware, and other laboratory necessities.

In addition to sourcing our equipment from trusted third-party brands, we manufacture much of our equipment in-house. With over 1,000 items stocked in our warehouse, you are sure to find the equipment that you’re looking for right here at Labsnova Equipment. For more information regarding our products, contact us today.