The rotary evaporator can rotate to form a thin film, evaporate it effectively and then cool and recycle solvents when it is heated at a constant temperature under reduced pressure. It is especially suitable for the crystallization, separation, solvent recovery and other operations of heat sensitive materials. Some models can be applicable for the back-flow extraction.
A rotary evaporator usually consists of several parts, including a motor unit, a vacuum system, a water or oil bath, a rotating flask, a receiving flask, condenser pipes and other components. A motor unit can keep the rotating flask or the evaporation flask rotate at a constant speed. A vacuum system can create a reduced pressure environment within the evaporator system. As well, it makes the pressure in the vacuum environment different from that in the atmosphere so that the continuous feeding is available. A water or oil bath are used to heat the sample. A rotating flask is heated thermostatically and can rotate at a constant speed. Then the material forms a large area of thin film on the inner surface of the flask. It has a higher evaporation efficiency. A receiving flask can collect the distilling solvent after it recondenses.
Working Principle of a Rotary Evaporator
A rotavap evaporates solvents from samples by utilizing the principle that the solvent will have a lower boiling point at a reduced pressure. Specifically speaking, the stepless speed regulation is adopted to make the evaporation flask rotate at a constant speed. By the rotation, materials can form a large area of uniform thin film on the inner wall of the flask. The evaporation flask is heated evenly by a water or oil bath, and materials, with a lower boiling point, is evaporated rapidly under the vacuum condition. The solvent steam is recycled in the receiving flask after being cooled by the high efficiency glass condenser.
Purposes of a Rotary Evaporator
A rotary evaporator is an essential separation equipment, which can remove a valtile solvent from a liquid mixture through evaporation and condensation. It is mainly used for concentration, crystallization, drying, separation and solvent recovery in pharmaceutical,chemical and bio-pharmaceutical fields and other fields. For example, a rotary evaporator can be used to remove ethanol from the mixture of ethanol and cbd oil in order to improve the purity of cbd oil. Also, it can be used to remove water within fruit juice, in order to make the fruit juice have a higher concentration. It can be seen that a rotary evaporator has a great number of purposes.
In recent years, the application of rotary evaporator has been extended to the cooking industry.Molecular cooking is a science that applies the principles of chemistry and physics to cooking.To some extent, molecular cooking has been promoted to be a proper term for describing innovative cooking styles. It is synonymous with cutting-edge technology and even psychology. The use of a rotary evaporator to non-heat evaporate liquid, thus retaining volatile aromatics that are easily lost by heating, is a perfect combination of modern culinary and experimental instruments.
How does a rotary evaporator remove solvent?
The basic working principle of a rotary evaporator removing solvent is that the sample materials are evaporated through the evaporation flask’s continuous rotation. There are several necessary components involved in the process of removing solvent, including a evaporation flask, a water/oil bath, a vacuum pump, a condenser and a receiving flask. Specifically speaking, the stepless speed regulation is adopted to make the evaporation flask rotate at a constant speed. By the rotation, materials can form a large area of uniform thin film on the inner wall of the flask. The evaporation flask is heated evenly by a water or oil bath, and materials, with a lower boiling point, is evaporated rapidly under the vacuum condition. The solvent steam is recycled in the receiving flask after being cooled by the high efficiency glass condenser. The process of removing solvent is completed.