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:
Feb. 19, 2008
Filed:
Jun. 27, 2003
Applicants:
Takeshi Nishimura, Himeji, JP;
Yukihiro Matsumoto, Kobe, JP;
Kenji Sanada, Himeji, JP;
Harunori Hirao, Himeji, JP;
Inventors:
Takeshi Nishimura, Himeji, JP;
Yukihiro Matsumoto, Kobe, JP;
Kenji Sanada, Himeji, JP;
Harunori Hirao, Himeji, JP;
Assignee:
Nippon Shokubai Co., Ltd., Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/16 (2006.01); C07C 51/42 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for the production of acrylic acid comprises (i) a step for introducing a polymerization inhibitor to a stage other than a stage for supplying a raw material and a stage for supplying a reflux of said distilling column or (ii) a step for supplying the acrylic acid recovered by thermally decomposing said oligomer to said stage for dehydration. Thus, the present invention enjoys effective utilization of acrylic acid and exalts the efficiency of production.