Process for the production of diaminodiphenylmethane and its higher homologues
US7238840B2 · kind B2 · utility
1Cited by
17References
4Claims
0Family size
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Key dates
| Filing date | Sep 21, 2004 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Feb 2, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J29/70
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Method of preparing diaminodiphenylmethane and higher homologues thereof from aniline and formaldehyde in the presence of heterogeneous solid acid catalysts selected from (a) delaminated zeolites and/or (b) metal silicate catalysts having an ordered mesoporous pore structure and/or (c) delaminated phyllosilicates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.