公开(公告)号：EP3000803A4

公开(公告)日：2016-12-28

申请号：EP13885426

申请日：2013-11-22

申请人： WANHUA CHEMICAL GROUP CO LTD ,  WANHUA CHEMICAL (NINGBO) CO LTD

发明人： LI XIN ,  CHEN HAO ,  ZHANG CONGYING ,  GAO SHAN ,  LIU ZHENGUO ,  WANG WEIJIA ,  TANG LEI ,  LIU ZHIPENG ,  LI YUAN ,  JIANG QINGMEI ,  SONG JINHONG ,  HUA WEIQI ,  DING HAO

IPC分类号： C07C209/72 ,  C07C211/36

CPC分类号： C07C209/72 ,  B01J23/96 ,  B01J38/08 ,  C07C2601/14 ,  Y02P20/584 ,  C07C211/36

摘要： Disclosed is a method for preparing diamino-dicyclohexyl methane (H 12 MDA) by hydrogenation of diamino-diphenyl methane (MDA). In the process, 4,4'-MDA used as the starting material is firstly hydrogenated to prepare 4,4'-H 12 MDA. When the activity of the catalyst is reduced, the feed is switched from 4,4'-MDA to the mixture of 2,4'-MDA and 4,4'-MDA, and then when the conversion is stabilized, the feed is switched to 4,4'-MDA again. The deactivated catalyst is activated on line by switching the feed to the mixture of 2,4'-MDA and 4,4'-MDA. 4,4'-H 12 MDA having the trans-trans isomer content of 16~24wt% is produced, and the mixture of 2,4'-H 12 MDA and 4,4'-H 12 MDA is also produced, wherein the content of 2,4'-H 12 MDA in the mixture is 4~15 wt%.