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:
Oct. 10, 2006
Filed:
Jun. 30, 2003
Applicants:
Kazuhiko Amakawa, Niigata, JP;
Takuji Shitara, Niigata, JP;
Inventors:
Kazuhiko Amakawa, Niigata, JP;
Takuji Shitara, Niigata, JP;
Assignee:
Mitsubishi Gas Chemical Co., Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 209/48 (2006.01);
U.S. Cl.
CPC ...
Abstract
In the process of the present invention, xylylenediamine and/or cyanobenzylamine is produced by a catalytic liquid-phase hydrogenation of a phthalonitrile compound. The liquid-phase hydrogenation is performed by controlling the concentration of a benzamide compound to a specific level or lower. In a preferred embodiment, the concentration of a benzoic acid compound is further controlled to a specific level or lower. By the process, xylylenediamine and/or cyanobenzylamine is produced at high yields and the catalyst life is prolonged.