REMOVAL OF LOW BOILERS AND REDUCTION OF AMMONIA CONTENT IN ISOPHORONEDIAMINE BY PARTIAL CONDENSATION

摘要

PROBLEM TO BE SOLVED: To provide a simple process for fine purification of isophoronediamine with a reduced ammonia content in pure isophoronediamine.SOLUTION: An additional partial condenser is used at the top of a second column of a two-column system for fine distillation of crude IPDA, so as to recycle a substream into a first column, thereby making it possible to reduce the ammonia content in pure IPDA.SELECTED DRAWING: None