Manufacture of hexamethylene diamine (US Patent 3972938)

Patent number: 3972938 Granted: 1976-08-03 Filed: 1974-03-11 Inventors: Dieter Voges (Mannheim, DE); Leopold Hupfer (Friedelsheim, DE); Siegfried Winderl (Heidelberg-Wieblingen, DE); Karl Wilhelm Leonhard (Bobenheim-Roxheim, DE); Herwig Hoffmann (Frankenthal, DE) Assignees: BASF Aktiengesellschaft (Ludwigshafen (Rhine), DE)

Abstract

A process for the catalytic hydrogenation of adiponitrile in the presence of ammonia, in which a portion of the reaction mixture is recycled and specific molar ratios of adiponitrile and ammonia are