Disclosed is a process for extending the useful life of a hydrogenation catalyst for making diamines in which 2-methylglutaronitrile and adiponitrile are charged separately to the catalyst in sequence with an intervening step of contacting the catalyst with hydrogen and ammonia at elevated temperature.
披露了一种延长制备二胺的氢化催化剂的有效寿命的过程,其中2-甲基
戊二腈和
己二腈分别按顺序充入催化剂,并在中间步骤中将催化剂与
氢气和
氨在高温下接触。