发明名称 |
Process for increasing the selectivity of the hydrogenation of 4,4'-diaminodiphenylmethane to 4,4'-diaminodicyclohexylmethane in the presence of an n-alkyl-4,4'-diaminodiphenylmethane |
摘要 |
The invention relates to a process for increasing the selectivity of the hydrogenation of 4,4'-diaminodiphenylmethane (4,4'-MDA) to diaminodicyclohexylmethane (4,4'-HMDA) by catalytic hydrogenation of a mixture containing 4,4'-MDA as the main component and its mono-N-methyl derivative as a secondary component. According to the invention, the hydrogenation is terminated before a conversion of 4,4'-MDA to 4,4'-HMDA of 99% is achieved. Under these conditions, a substantially smaller proportion of the N-methyl-4,4'-MDA is hydrogenated to N-methyl-4,4-HMDA.
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申请公布号 |
US2005148797(A1) |
申请公布日期 |
2005.07.07 |
申请号 |
US20040516319 |
申请日期 |
2004.12.13 |
申请人 |
JAEGER BERND;HAAS THOMAS;STOCHNIOL GUIDO;LETTMANN CHRISTIAN;HOFEN WILLI;STADTMULLER KLAUS;LOTZ JORG |
发明人 |
JAEGER BERND;HAAS THOMAS;STOCHNIOL GUIDO;LETTMANN CHRISTIAN;HOFEN WILLI;STADTMULLER KLAUS;LOTZ JORG |
分类号 |
C07B61/00;C07C209/72;C07C211/36;(IPC1-7):C07C29/72 |
主分类号 |
C07B61/00 |
代理机构 |
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地址 |
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