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:
Mar. 04, 2014
Filed:
Jun. 24, 2010
Satoshi Nakagawa, Himeji, JP;
Satoshi Nakagawa, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
A process for producing (meth)acrylic acid, comprising the step of repeating a crystallization operation 'n' times (providing 'n' is an integer 2 or more) to produce purified (meth)acrylic acid from crude (meth)acrylic acid, wherein a (meth)acrylic acid solution is crystallized and the crystallized (meth)acrylic acid is melted to obtain a (meth)acrylic acid melt in the crystallization operation; wherein a constant amount Aof the (meth)acrylic acid solution is subjected to the kcrystallization operation (providing “k” is an integer 1 to n−1), and the (meth)acrylic acid melt obtained by the kcrystallization operation is utilized as the (meth)acrylic acid solution for the k+1crystallization operation without being discharged from a crystallizer or is transferred from the crystallizer to a k+1storage tank for storing the (meth)acrylic acid solution to be used in the k+1crystallization operation depending on the stored amount of the k+1storage tank.