The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2011
Filed:
Jun. 15, 2007
Applicants:
Daniel Amoros, Venissieux, FR;
Denis Rachez, St Genis Laval, FR;
Inventors:
Daniel Amoros, Venissieux, FR;
Denis Rachez, St Genis Laval, FR;
Assignee:
Rhodia Operations, Aubervilliers Cedex, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 209/48 (2006.01);
U.S. Cl.
CPC ...
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.