Vacuum evaporation system is used for removing the solvent from the miscella from the oil extractor to obtain the crude extracted oil. The main equipment includes the first rising film evaporator, the second rising film evaporator, and disk stripping column.
Utilizing the difference of boiling point between the oil and solvent, the evaporator heats the miscella so that most of the solvent vaporizes and separates with the oil.
Then utilizing the difference of volatility between the oil and solvent, the stripping tower adopts steam distillation method to remove the residual solvent in the miscella.
After evaporation and steam stripping, crude extracted oil of low residual solvent content is obtained. The solvent vapor enters the condenser to be recycled to use. The solvent evaporation system adopts negative pressure evaporation technology, using the secondary steam from the desolventizer toaster as the heat source of the first evaporator and using the steam jet pump to vacuumize the system to make it works under negative pressure, having low evaporating temperature and good oil quality, saving steam and solvent consumption.