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. 05, 2015
Filed:
Jul. 30, 2010
Erich J. Molitor, Midland, MI (US);
Daniel A. Hickman, Midland, MI (US);
Shawn D. Feist, Midland, MI (US);
David C. Molzahn, Midland, MI (US);
Stacie Santhany, Auburn, MI (US);
Abraham D. Schuitman, Midland, MI (US);
Erich J. Molitor, Midland, MI (US);
Daniel A. Hickman, Midland, MI (US);
Shawn D. Feist, Midland, MI (US);
David C. Molzahn, Midland, MI (US);
Stacie Santhany, Auburn, MI (US);
Abraham D. Schuitman, Midland, MI (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
A process for reductive amination of aliphatic cyanoaldehydes to aliphatic diamines comprising (1) providing a mixture of 1,3-cyanocyclohexane carboxaldehyde and/or 1,4-cyanocyclohexane carboxaldehyde; (2) contacting said mixture with a metal carbonate based solid bed or a weak base anion exchange resin bed at a temperature from 15 to 40 ° C. for a period of at least 1 minute; (3) thereby treating said mixture, wherein said treated mixture has a pH in the range of 6 to 9; (4) feeding said treated mixture, hydrogen, and ammonia into a continuous reductive amination reactor system; (6) contacting said treated mixture, hydrogen, and ammonia with each other in the presence of one or more heterogeneous metal based catalyst systems at a temperature from 80 ° C. to 160 ° C. and a pressure from 700 to 3500 psig; (7) thereby producing one or more cycloaliphatic diamines is provided.