In the laboratories to increase concentration of substances dissolved in the water, vacuum evaporators are used. Rotary evaporators are commonly used in the laboratories for the purpose of separation. Used in several fields, they are mostly utilized to separate solvents from samples. Also known as rotovaps, the rotary evaporators are essentially reduced pressure distillations.
The rotary evaporator comprises a water bath on top of which a round-bottomed flask is placed. In the flask a solution is placed and rotated. Simultaneously, the rotovap gets somewhat evacuated with the help of a vacuum pump or water aspirator.
The vacuum pump will reduce the pressure inside the evaporator. This will ensure that the solvent heats up at a much lower temperature than usual. The rotating flask increases the surface area of the fluid. This in turn helps in increasing the evaporation rate. When it comes in contact with the condensing unit, the solvent vapor condenses and then gets collected in the receiving flask. This process leaves the precipitated compound in the receiving flask.
Parts of a rotary evaporator
There are four parts in a rotovap or rotary evaporator —evaporation, vacuum pump, condenser and the receiver.
- The evaporation flask moves at a persistent speed to help in the process of evaporation. It’s interesting because the evaporation flask will keep rotating at a continual speed to increase the evaporation area. This is just to get the materials evaporated more easily and quickly.
- The job of the vacuum pump is to remove the gas from the sealed apparatus and leave behind a moderate vacuum. This is to keep the purity of extracted solvents intact. The vacuum pump then offers the rotary evaporator to create a vacuum environment. So, what is the function of the vacuum environment? Primarily, it helps in maintaining a reduced pressure environment which is needed by the rotary evaporator. On the other hand, an automatic feeding system is created due to the pressure difference between the vacuum environment and the atmospheric pressure.
- The condenser aids in cooling off the apparatus. It also helps in turning the extracted solvents into liquid from gas. In the condensing part, the gaseous elements get condensed by the condensing tubes and eventually get turned into liquid. Primarily, it helps in maintaining a reduced pressure environment which is needed by the rotary evaporator. On the other hand, an automatic feeding system is created due to the pressure difference between the vacuum environment and the atmospheric pressure. This makes it more convenient for the user to collect the material.
- Finally, the liquid solvent reaches the receiving flask for the users to collect. This is also the final part of the working process. Here the liquid elements will be transferred and collected eventually. So, the users will have to face no issues and can easily take the receiving flask down.
Advantages of vacuum evaporator
- The vacuum evaporator is easy and simple to operate. Since it is an easy apparatus, it is cost effective and thus makes it dearer to the customers. The customers like the equipment for its appropriate application.
- The film of the vacuum evaporator is of extreme premium quality and pure. When compared to other evaporation equipment, vacuum evaporators can be electrically controlled to allow the round bottom flask to function under suitable conditions in order to increase the area of evaporation.
- The film of the vacuum evaporator is extremely productive and also has a clean pattern. Courtesy the high level of production of the film, the formation time of the film is also extremely curtailed.
- The growth functionality of the vacuum evaporator is rather simple. The main classifications of the films include electron beam evaporation plating, electron evaporation plating, heating evaporation plating and high frequency induction heating political plating.
The film of the vacuum evaporator is known for its simple growth mechanism, high purity, elementary structure and higher film productiveness.
Applications of rotovap
A rotovap or rotary evaporator is mostly used for the process of crystallization, evaporation, concentration, solvent recovery, drying and separation. It is also used for the uninterrupted distillation of large amounts of eruptive solvents under reduced pressure. With so many useful applications, undoubtedly, the rotary evaporators are extremely functional in the chemical and pharmaceutical industries. In fact, rotary evaporators are largely used in the biological, pharmaceutical, chemical fields and even in the food and beverage industries.