The rotary evaporator drives the flask to rotate and heat through the motor, so that the solution in the flask is heated, diffused and evaporated. What if the evaporation efficiency is low?
1. Check whether the seals of all parts of the equipment are damaged, resulting in low vacuum. A good vacuum can effectively suppress the boiling of aqueous solution and improve the efficiency of evaporation and condensation.
2. Some alcohol can be added to the solution to extract the water from the solution, which can effectively improve the efficiency. Toluene can also be added to form azeotrope, and then the water can be removed by rotating evaporator.
3. Reduce the temperature of cooling water in the condensation system to below 0 ℃. It is recommended to use recirculating chiller, which has large refrigerating capacity and fast refrigerating speed.
4. Reduce the amount of solution evaporated each time, which can be carried out several times, which can significantly improve the efficiency.
