Method for recovering organic amine

摘要

Problem to be solved: to provide a method for efficiently recovering useful components such as organic amine compounds from liquid phase components after recovery of isocyanate.The following formula (I)From the liquid phase component which is produced in the manufacturing method of the compound (I) represented by N11 with 1 to 3 integersThe following formula (III)The method for recovering the compound (III) represented by N31 represents 1 to 3 integersStep (1): reaction of liquid phase components with active hydrogen containing compounds in a reactorStep (2): returning the condensate obtained by cooling the vapor phase components of the reactor into the reactorStep (3): discharging the vapor phase components not condensed in step (2) to the reactorAnd (4) as liquid phase components in the reactor.The step of discharging the reaction solution containing compound (III) outside the reactorIncludingThe active hydrogen containing compound isCombination of water and aromatic hydroxy compoundsOrIt is a combination of water and alcohol.No selection