Preparation of primary diamines

Details Preparation of primary diamines Preparation of primary diamines

2011-05-10

2011-05-10

Davis, Brian J (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C564S491000, C564S498000

Reexamination Certificate

active

07939691

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.

REFERENCES:
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patent: 6139693 (2000-10-01), Bassler et al.
patent: 6887352 (2005-05-01), Ostermaier
patent: 2006/0058545 (2006-03-01), Ostermaier
patent: 2006/0058555 (2006-03-01), Ostermaier
patent: 731 819 (1955-06-01), None
International Search Report corresponding to PCT/FR 2007/000998 issued on Jan. 3, 2008.

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