Distillation of rotary evaporator
Distillation is the thermodynamic process of separating a liquid by utilizing the properties of the substance, the relationship between pressure and boiling point, and then condensing.
The boiling point temperature decreases as the external air pressure decreases, which means that a lot of work can usually be carried out after decompression, so that the heating pot is kept at a stable temperature (such as: 60 ° C).Using a vacuum controller, the boiling point is set at a steam temperature of about 40 ° C and the condenser cooling water temperature should be below 20 ° C.
A chemical diaphragm pump with a vacuum controller can be used for vacuum control, and a vacuum buffered reflux bottle prevents residual solvent from flowing into the vacuum pump. Solvents can pollute the environment when using a jet pump to control vacuum.
Speed, temperature, evaporation bottle size, and system pressure all affect the rotary evaporator discharge.
The optimum steam volume for the condenser is 60%. This value corresponds to 2/3 of the cooling coil cooling capacity, and a larger amount of steam may cause uncooled solvent to overflow.
When other types of condensing tubes are used, such as dry ice or reinforced condensing tubes, and using a cannulated recovery fractionating condensing tube, the load bearing should be correspondingly reduced due to the increased weight of the glazing unit.Therefore, before the experiment, it should be tested whether the system can lift the distilled sample when the power is interrupted.