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:
Sep. 25, 2012
Filed:
Dec. 30, 2010
Applicants:
Hsi-yen Hsu, Taipei, TW;
Yu-shan Chao, HsinChu, TW;
Inventors:
Hsi-Yen Hsu, Taipei, TW;
Yu-Shan Chao, HsinChu, TW;
Assignee:
Industrial Technology Research Institute, Hsinchu County, TW;
Primary Examiner:
Int. Cl.
CPC ...
C07D 307/60 (2006.01);
U.S. Cl.
CPC ...
Abstract
The disclosure provides a method for preparing the citraconic anhydride and a method for isomerizing/dehydrating itaconic acid. The method for preparing the citraconic anhydride includes the following steps: providing itaconic acid as a starting material; and subjecting the itaconic acid to an isomerization/dehydration reaction in the presence of a catalyst to obtain the citraconic anhydride, wherein the catalyst includes a heteropolyacid or heteropolyacid salt.