METHOD FOR DISTILLING AMMONIA

摘要

The invention concerns an improved method for distilling ammonia from a mixture, more particularly a mixture derived from the reaction between an aminonitrile and water (reaction also referred to as cyclizing hydrolysis). More precisely, the invention concerns a method for distilling ammonia contained in an aqueous caprolactam solution, characterised in that it consists in distilling by means of a column, having a base temperature not more than 160 DEG C and under absolute pressure not more than 5 bar, the distilled ammonia at the column top being compressed under pressure not less than 10 bar, then condensed at a temperature ranging from 25 DEG C to 60 DEG C.