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:
Mar. 29, 2011
Filed:
Jun. 22, 2005
Applicant:
Kazuhiko Amakawa, Niigata, JP;
Inventor:
Kazuhiko Amakawa, Niigata, JP;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 209/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of producing xylylenediamine from xylene. In the method, xylene is converted into dicyanobenzene by ammoxidation. The produced dicyanobenzene is extracted into an organic solvent. The extract is then distilled to separate dicyanobenzene from the organic solvent. After added with a solvent, the separated dicyanobenzene is hydrogenated in a liquid phase. Finally, the hydrogenation product is purified by distillation to obtain a highly pure xylylenediamine. The method is conducted in a simple and low energy-consuming process.