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:
Nov. 04, 2003
Filed:
Jan. 30, 2001
Applicant:
Inventors:
Tetsuji Mitsumoto, Himeji, JP;
Yukihiro Matsumoto, Kobe, JP;
Sei Nakahara, Himeji, JP;
Tatsuaki Yoshimura, Ibo-gun, JP;
Assignee:
Nippon Shokubai Co., Ltd., , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 5/142 ; C07C 5/702 ;
U.S. Cl.
CPC ...
C07C 5/142 ; C07C 5/702 ;
Abstract
A method for producing (meth)acrylic acid of high purity by repressing formation of a polymer possibly generated during the course of production is disclosed. The production is accomplished by returning the waste liquid generated at the step of the addition of aldehyde treating agents (d) to the step of the absorption (b) and/or the step of separation (c).