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. 02, 2004
Harunori Hirao, Himeji, JP;
Kouji Ueno, Himeji, JP;
Naoki Serata, Himeji, JP;
Takeshi Yokogoshiya, Himeji, JP;
Harunori Hirao, Himeji, JP;
Kouji Ueno, Himeji, JP;
Naoki Serata, Himeji, JP;
Takeshi Yokogoshiya, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
A method for producing acrylic acid by absorbing acrylic acid at a high ratio and obtaining an acrylic acid-containing solution of high concentration is provided. This method comprises a step of circulating part of a discharged gas from an absorption step of acrylic acid to the reactor and discarding the remainder to the out side of system while the gas is cooled before circulation to the reactor. By the method, the acrylic acid-containing solution of high concentration is obtained due to decrease of an acrylic acid loss.