Patent ID: 7900473

Claim:
A method for adiabatic cooling type crystallization of organic compound comprising: carrying out adiabatic cooling, as for crystallization operation of target organic compound and evaporation operation of a coolant which is directly introduced in crystallizer for a mixture solution of a target organic compound containing the coolant; taking out crystal slurry produced by the operation from the crystallizer; pressurizing evaporated vapor to a pressure higher than the operation pressure in the crystallizer by a compressor, introducing the pressurized coolant vapor to an absorption condenser, removing the heat of absorption and condensation, cooling the mixture solution of organic compound and the evaporated coolant vapor that has been pressurized, while allowing them to contact each other in the absorption condenser; introducing this absorption condensate to the crystallizer; subjecting the crystal slurry taken out from the crystallizer to solid-liquid separation; and sending the separated mother liquid back to the absorption condenser.