What is Rotary evaporator?

A rotary evaporator is a specialized device that uses low pressure to promote the formation of aromatic extracts through the evaporation of liquids at low temperatures. This device is often found in chemical laboratories, where it is used to volatilize solvents from various mixtures, as well as to fractionate liquids. The use of rotary evaporator in cooking began relatively recently, so the method of extracting aromatic extracts in this way is considered very innovative.

Rotary evaporator usage

Previously, only in the chemical field was used rotary evaporator, and its invention is attributed to the American biochemist Leeman Craig. This event took place in 1950, but the first model of this equipment remained far from perfect. Over a long period of time, changes, and improvements were made to its design. Thus, in 1957, the Swiss scientist Walter Büchi presented the first prototype of the rotary vaporizer to the public. By the 1970s, this new device could be found in almost any chemistry laboratory.

However, in the 2000s, chefs also became interested in the rotary evaporator and noticed its potential. They began to use the extracts obtained to add a unique flavor to their dishes. This was especially evident in molecular cuisine. This made it possible to create exquisite delicacies.

Rotary evaporator construction

1. The design of a lab rotary evaporator system includes the use of the following components:
2. A water or oil bath that acts as a heat transfer medium.
3. A distillation flask and a receiving flask where the evaporation process and condensate collection take place.
4. A reflux condenser, which provides cooling of the solution vapor.
5. A mechanism for rotating the flask, which promotes more efficient evaporation.
6. A tripod and connecting parts that provide a secure fixation of the components.
7. A prominent element in the structure of the rotary vacuum evaporator is a special device designed to form and maintain a vacuum in the system.

It is interesting to note that the design of the rotary evaporator looks quite unique. It includes a glass tube with a slit that connects to a flask that is heated using a water bath. Due to the particularly low pressure created by the rotary evaporator (a vacuum pump is optional), the liquid begins to boil at much lower temperatures, such as 30°, rather than the usual 100°.

The rotating mechanism allows the flask to rotate, which greatly increases the rate of vaporization and reduces the likelihood of solution escaping from the flask. The speed of rotation and the degree of heating of the solution can be easily adjusted by the user. As a result, the solvent vapors are directed to a special return cooler, also known as a "coil", where they are cooled and the condensed liquids flow back into the receiver flask. This is where your extract is formed and collected.

How the Rotary evaporator works

The hot water must warm up and the condenser must cool down. This reverse situation usually leads to unwanted consequences.

Fix the receiver flask and the assay flask using the fixing clips. Then turn on the rotor. Its rotation speed should be sufficient to ensure uniform coating of the inner surface of the flask.

Wait for the vacuum pump to start its operation. Close the valve on the condenser until its whistling subsides, but you can still hear the characteristic "pop" sound when you close it with your thumb.

The liquid should steep in the vacuum for about one minute and will probably start boiling during this time. It is advisable to prevent this from happening.

Where to buy Rotary evaporator

We offer to buy vacuum rotary evaporator for the purpose of liquid evaporation. This equipment has been successfully used in the medical field, chemical industry and in the manufacture of pharmaceuticals. Available evaporators are 5 liters, 10 liters and 20 liters. Our company supplies directly from trusted suppliers, which provides our customers with minimum prices and full compliance with the characteristics of the equipment to the stated parameters. Vacuum rotary evaporators are in high demand in the market, so we recommend to check their availability in stock in due time.

Remember, how to choose best model. You should consider the following things:

1. Condenser type. The choice is between water-cooled models and the use of dry ice.
2. Useful volume and flask size. Depending on the volume of the sample used in the experiments, you should go for the more efficient models or for products with compact dimensions. For vacuum distillation, it is important that the volume of liquid to be distilled does not exceed half the volume of the distillation flask.
3. Rotation speed. Modern devices provide a wide range of values for the flask rotation speed, providing flexibility in use.
4. Vacuum regulator. For more precise control over the distillation process, it is recommended to look for models with a built-in vacuum regulator.

Do not miss the opportunity to choose the right model of vacuum rotary evaporator considering the above mentioned aspects. Our company is ready to help you decide on your choice and provide you with high quality equipment. And you should know, that our rotary evaporator price one of the best on market.