公开(公告)号：AT371638T

公开(公告)日：2007-09-15

申请号：AT03790870

申请日：2003-08-06

Applicant: BASF AG

Inventor： FUNKE FRANK ,  HILL THOMAS ,  VON WATZDORF JOBST ,  MATTMANN WOLFGANG ,  HARDER WOLFGANG ,  HENKES ERHARD ,  LITTMANN GERD ,  JULIUS MANFRED

IPC: C07C209/54 ,  C07C209/84 ,  C07B61/00 ,  C07C29/68 ,  C07C209/82 ,  C07C209/86 ,  C07C211/36

Abstract: Pure isophorone-diamine (IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 is obtained by (a) making crude IPDA with a CTR below 73/27, (b) purifying and separating into fractions with CTR of at least 73/27 (b1) and below 63/37 (b2), (c) isomerizing (b2) in presence of hydrogen, ammonia and catalyst to give IPDA with a CTR of 63/37-66/34 which is recycled to stage (a). A method (M1) for the production of substantially pure 3-aminomethyl-3,5,5-trimethyl cyclohexylamine (isophorone-diamine; IPDA) with a cis/trans isomer ratio (CTR) of at least 73/27 involves: (a) preparation of crude IPDA with a CTR of less than 73/27, (b) purification and separation to give fractions (b1) with a CTR of at least 73/27 and (b2) with a CTR of less than 63/27 and (c) isomerization of (b2) in presence of hydrogen, ammonia and a hydrogenation catalyst to give IPDA with a CTR of 63/37-66/34 which is then recycled to stage (a). An Independent claim is also included for a method (M2) for the production of IPDA with a CTR in the range 63/37 to 66/34 by reacting IPDA with any CTR value with hydrogen and ammonia in presence of a hydrogenation catalyst.