Preparation of both hexamethylene diamine and aminocapronitrile

Details Preparation of both hexamethylene diamine and aminocapronitrile Preparation of both hexamethylene diamine and aminocapronitrile

2011-07-05

2011-07-05

Shiao, Rei-tsang (Department: 1628)

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

Organic compounds

Nitriles

C564S463000, C564S511000

Reexamination Certificate

active

07973192

ABSTRACT:
Hexamethylenediamine and aminocapronitrile are simultaneoussly produced by hemihydrogenation of adiponitrile, which includes a stage of separation of the hexamethylenediamine from the hydrogenate by distillation of the hexamethylenediamine, the distillation of the hexamethylenediamine being carried out from the hydrogenate containing a free acid and/or an alkali metal or ammonium acid salt, whereby a top fraction A recovered at the column top of the stage of distillation of the hexamethylenediamine is essentially crude hexamethylenediamine and a small amount of THA; the amount of THA (tetrahydroazepine) present in the crude hexamethylenediamine constitutes a small proportion of the THA present in the hydrogenate.

REFERENCES:
patent: 5717090 (1998-02-01), Bassler et al.
patent: 6384283 (2002-05-01), Leconte
patent: 2007/0118001 (2007-05-01), Bocquenet et al.
patent: 1077932 (2001-02-01), None
patent: WO 03/062188 (2003-07-01), None

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