Method for preparing diamino-dicyclohexyl methane

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United States of America Patent

PATENT NO 9580380
APP PUB NO 20160068472A1
SERIAL NO

14761890

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Disclosed is a method for preparing diamino-dicyclohexyl methane (H12MDA) 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′-H12MDA. 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′-H12MDA having the trans-trans isomer content of 16˜24 wt % is produced, and the mixture of 2,4′-H12MDA and 4,4′-H12MDA is also produced, wherein the content of 2,4′-H12MDA in the mixture is 4˜15 wt %.

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Patent OwnerAddress
WANHUA CHEMICAL (NINGBO) CO LTD315812 WANHUA INDUSTRIAL PARK 39 HUANDAO NORTH ROAD DAXIE DEVELOPMENT ZONE NINGBO CITY ZHEJIANG PROVINCE NINGBO CITY ZHEJIANG PROVINCE 315812
WANHUA CHEMICAL GROUP CO LTD264006 NO 59 CHONGQING STREET YANTAI ECONOMIC AND TECHNOLOGICAL DEVELOPMENT ZONE SHANDONG PROVINCE YANTAI CITY SHANDONG PROVINCE 264006

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Hao Shandong, CN 1012 6150
Ding, Hao Shandong, CN 52 215
Gao, Shan Shandong, CN 179 875
Hua, Weiqi Shandong, CN 39 31
Jiang, Qingmei Shandong, CN 7 3
Li, Xin Shandong, CN 946 7137
Li, Yuan Shandong, CN 465 4935
Liu, Zhenguo Shandong, CN 19 163
Liu, Zhipeng Shandong, CN 40 162
Song, Jinhong Shandong, CN 5 4
Tang, Lei Shandong, CN 112 1046
Wang, Weijia Shandong, CN 23 1221
Zhang, Congying Shandong, CN 7 4

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