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:
Dec. 11, 2012
Filed:
Oct. 02, 2008
Didier Letourneur, Rixheim, FR;
Philippe Leconte, Ribeauvillé, FR;
Jean-francis Spindler, Ternay, FR;
Patrick Lermusiaux, Lyons, FR;
Vincent Boschat, Cusset, FR;
Didier Letourneur, Rixheim, FR;
Philippe Leconte, Ribeauvillé, FR;
Jean-Francis Spindler, Ternay, FR;
Patrick Lermusiaux, Lyons, FR;
Vincent Boschat, Cusset, FR;
Rhodia Operations, Aubervilliers, FR;
Abstract
Amino compounds are continuously prepared by hydrogenation of nitrile compounds in the presence of a catalyst, and more particularly diamines are prepared by the continuous hydrogenation of dinitrile compounds in the presence of a Raney metal catalyst and in the absence of an alcoholic solvent; the subject process includes extracting a portion of the catalyst present in the reaction medium, the extracted portion of the catalyst is submitted to a regeneration for providing a catalyst having a catalytic activity lower than that of a fresh catalyst but still high and the regenerated catalyst is recycled to the reaction medium together with fresh catalyst according to a predetermined ratio, whereby the consumption of catalyst is reduced per ton of amines produced.