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. 07, 2013
Filed:
Oct. 03, 2008
Applicants:
Maria Ignez Broglio, Sao Paulo, BR;
Daniel Amoros, Venissieux, FR;
Jean Vannier, Saint Bonnet de Mure, FR;
Dider Letourneur, Rixheim, FR;
Inventors:
Maria Ignez Broglio, Sao Paulo, BR;
Daniel Amoros, Venissieux, FR;
Jean Vannier, Saint Bonnet de Mure, FR;
Dider Letourneur, Rixheim, FR;
Assignee:
Rhodia Operations, Aubervilliers, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 209/84 (2006.01);
U.S. Cl.
CPC ...
Abstract
Impure hexamethylenediamines and more particularly those hexamethylenediamines containing contaminating amounts of tetrahydroazepine (THA), or more generally contaminating amounts of imines, are purified by distillation carried out with a short retention time of the impure hexamethylenediamine in the distillation column; the hexamethylenediamine obtained has a very low concentration of THA.