Title:
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
Document Type and Number:
WIPO Patent Application WO2004007425
Kind Code:
A3
Abstract:
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.
Inventors:
JAEGER BERND (DE)
HAAS THOMAS (DE)
STOCHNIOL GUIDO (DE)
LETTMANN CHRISTIAN (DE)
HOFEN WILLI (DE)
STADTMUELLER KLAUS (DE)
LOTZ JOERG (DE)
HAAS THOMAS (DE)
STOCHNIOL GUIDO (DE)
LETTMANN CHRISTIAN (DE)
HOFEN WILLI (DE)
STADTMUELLER KLAUS (DE)
LOTZ JOERG (DE)
Application Number:
PCT/EP2003/006669
Publication Date:
March 04, 2004
Filing Date:
June 25, 2003
Export Citation:
Assignee:
DEGUSSA (DE)
JAEGER BERND (DE)
HAAS THOMAS (DE)
STOCHNIOL GUIDO (DE)
LETTMANN CHRISTIAN (DE)
HOFEN WILLI (DE)
STADTMUELLER KLAUS (DE)
LOTZ JOERG (DE)
JAEGER BERND (DE)
HAAS THOMAS (DE)
STOCHNIOL GUIDO (DE)
LETTMANN CHRISTIAN (DE)
HOFEN WILLI (DE)
STADTMUELLER KLAUS (DE)
LOTZ JOERG (DE)
International Classes:
C07B61/00; C07C209/72; C07C211/36; (IPC1-7): C07C209/72; C07C211/36
Foreign References:
| EP0392435A1 | 1990-10-17 | |||
| US5360934A | 1994-11-01 | |||
| EP0476359A1 | 1992-03-25 | |||
| EP0324190A2 | 1989-07-19 | |||
| EP0231788A1 | 1987-08-12 | |||
| EP0639403A2 | 1995-02-22 |
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