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. 28, 2013
Filed:
May. 17, 2010
Stefan Wershofen, Mönchengladbach, DE;
Stephan Klein, Shanghai, CN;
Hongchao LI, Pudong, CN;
Xinkui Wang, Shanxi, CN;
Qifeng LI, Shanxi, CN;
Maoqing Kang, Shanxi, CN;
Stefan Wershofen, Mönchengladbach, DE;
Stephan Klein, Shanghai, CN;
Hongchao Li, Pudong, CN;
Xinkui Wang, Shanxi, CN;
Qifeng Li, Shanxi, CN;
Maoqing Kang, Shanxi, CN;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The present invention relates to a novel catalyst for producing N-substituted carbamates, the preparation of the catalyst and an improved method for producing N-substituted carbamates from these novel catalysts. The active component of the catalyst is a heteropoly acid and the catalyst support comprises a metal oxide or a metalloid oxide. The catalyst can be used to promote the reaction of carbamate and amine, thereby generating N-substituted carbamates with high yield. In the presence of the catalyst, the reaction conditions are relatively mild, the catalytic activity and selectivity of the reaction are high, and the reaction time is relatively short. Furthermore, the catalyst can be conveniently separated from the reaction system and recycled. therefore, the catalyst can be used to facilitate the further scale-up test and commercial application.