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. 27, 2007
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., Inc., Osaka, JP;
Abstract
A method for producing acrylic acid by using an acrylic acid-containing solution of high concentration without azeotropic distillation is provided. This method of producing acrylic acid comprises introducing an acrylic acid-containing gas obtained by catalytic gas phase oxidation reaction into an absorption column and supplying the acrylic acid-containing solution to crystallization step thereby separating the solution into acrylic acid and residual mother liquid, and distilling at least part of the residual mother liquid and circulating the distillate obtained by the distillation to the absorption column.