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. 25, 2014
Filed:
Jan. 29, 2010
Kazuhiko Sakamoto, Himeji, JP;
Koji Ueno, Himeji, JP;
Yoshitake Ishii, Himeji, JP;
Takashi Sugimoto, Himeji, JP;
Masatsugu Kitaura, Himeji, JP;
Satoshi Nakagawa, Himeji, JP;
Kunihiko Suzuki, Himeji, JP;
Kazuhiko Sakamoto, Himeji, JP;
Koji Ueno, Himeji, JP;
Yoshitake Ishii, Himeji, JP;
Takashi Sugimoto, Himeji, JP;
Masatsugu Kitaura, Himeji, JP;
Satoshi Nakagawa, Himeji, JP;
Kunihiko Suzuki, Himeji, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
A process for producing (meth)acrylic acid of the present invention comprises the steps in the following order: a crystallization step of supplying a cooling medium cooled by a heat source device to a crystallizer to obtain a (meth)acrylic acid crystal from a crude (meth)acrylic acid solution; an adjustment step of returning the cooling medium discharged from the crystallizer to the crystallizer without cooling; a sweating step of supplying a heating medium to the crystallizer to partially melt the (meth)acrylic acid crystal, thereby obtaining a melted liquid, and discharging the melted liquid from the crystallizer; and a melting step of supplying the heating medium to the crystallizer to melt the (meth)acrylic acid crystal, thereby obtaining purified (meth)acrylic acid. According to the present invention, purified (meth)acrylic acid with high purity can be obtained.