Preparation of primary diamines
US7939691B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Jun 15, 2007 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Jun 15, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C209/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Primary diamines are prepared by hydrogenation of a dinitrile compound in the presence of a catalyst, in particular hexamethylenediamine is prepared by hydrogenation of adiponitrile; the product diamines are recovered by distillation in several distillation columns mounted in series and the heavy impurities are separated from the second distillation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.