A rotary evaporator (rotovap or rotatvap) is an essential equipment for the processes of evaporation, concentration, crystallization, drying, separation, and solvent recovery in pharmaceutical, chemical and bio-pharmaceutical fields and other sectors. It’s usually used to remove solvents from a mixture of compounds. Besides, rotary evaporators can be even used in people’s daily life, such as in the kitchen. In the following, let’s go through how a rotary evaporator can be used in the kitchen.
How can a Rotary Evaporator be Used in the Kitchen?
Firstly, a rotary evaporator can be used to concentrate all kinds of juice through removing water. With a rotary evaporator, people can do it easily at home, and the juice concentrated can possess a much better taste.
Secondly, several kinds of food can be extracted by a rotary evaporator as well. For example, the desired flavors can be extracted from a blend of alcohol, herbs and fruit.
Thirdly, extracting brandy and syrup from wine is another using way.
Fourthly, because the complex composition of food samples, proteins, fats, and sugars often cause interference in analysis and detection. Therefore, rotary evaporator is often used for treatment in advance.
Last but not least, a rotary evaporator also plays an important role in the process of making coffee. As is known to all, coffee is a kind of food material that is ubiquitous in the market. It uses coffee beans and/or coffee products (ground coffee powder, coffee extract or its concentrate) as raw materials. It can add food additives without adding other food raw materials. It is a solid beverage that has been processed. In the process of making coffee, a rotary evaporator can be used to concentrate coffee by removing water from it.
What is the Principle of a Rotary Evaporator?
The principle of a rotary evaporator is that the boiling points of solvents will reduce when the pressure decreases. Speaking specifically, the boiling point will decrease with reducing pressure, and increase with increasing pressure. As a result, the solvents are capable of being vaporized at much lower temperature than their boiling points at the normal pressure.
What are Purposes of a Rotary Evaporator?
As a common and essential equipment used in laboratories and industries, a rotary evaporator has a great number of purposes. It is mainly used for the process of evaporation, concentration, crystallization, drying, separation, and solvent recovery, and especially used for the continuous distillation of large amounts of volatile solvents under reduced pressure. With so many application purposes, there is no doubt that a rotary evaporator can be applied in many areas. For example, it can be used in the small and pilot experiments and production in the biological, pharmaceutical, chemical fields and even food-making industries.
Why do we Use a Rotary Evaporator for Evaporation?
1. Higher evaporation efficiency.
There are several factors contributing to higher evaporation efficiency. Firstly, the rotating flask can rotate at a constant speed, and materials can form a widespread film on the inner surface of the flask, which improves the evaporation efficiency greatly. Secondly, the high-efficiency glass condenser can improve the evaporation efficiency as well. Last but not least, continuous feeding and high vacuum degree are another factors.
2. Better security.
The stainless steel and aluminum alloy are widely used in the mechanical structure, and all glass parts are made of heat-resistant high borosilicate glass, which ensure a better security. Besides, the water/oil bath can be equipped with transparent covers to prevent splashing, and anti-explosion frequency changer and dynamo are available as well. All of these designs contribute to better security.
3. More convenient operation.
It’s much more convenient to use a rotary evaporator, because of the electrodeless speed regulation, digital display K Type Sensor and intelligent temperature control and other designs adopted by it.