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:
Dec. 19, 2006
Filed:
Jun. 02, 2004
Kouji Ueno, Himeji, JP;
Harunori Hirao, Himeji, JP;
Naoki Serata, Himeji, JP;
Takeshi Yokogoshiya, Himeji, JP;
Kouji Ueno, Himeji, JP;
Harunori Hirao, Himeji, JP;
Naoki Serata, Himeji, JP;
Takeshi Yokogoshiya, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
A method for producing acrylic acid from an acrylic acid-containing solution of high concentration without performing azeotropic distillation is provided. This method of producing acrylic acid comprises steps of absorbing acrylic acid-containing gas, distilling the acrylic acid-containing solution without using an azeotropic solvent thereby obtaining crude acrylic acid as a column bottom stream and/or a column side stream, and supplying the crude acrylic acid to a crystallizing step and melt crystallizing the crude acrylic acid thereby obtaining purified acrylic acid.