Invention Grant
- Patent Title: Process for production of (meth) acrylic acid
- Patent Title (中): (甲基)丙烯酸生产方法
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Application No.: US13266672Application Date: 2010-05-07
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Publication No.: US08530699B2Publication Date: 2013-09-10
- Inventor: Yoshitake Ishii , Koji Ueno
- Applicant: Yoshitake Ishii , Koji Ueno
- Applicant Address: JP Osaka
- Assignee: Nippon Shokubai Co., Ltd.
- Current Assignee: Nippon Shokubai Co., Ltd.
- Current Assignee Address: JP Osaka
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- Priority: JP2009-120623 20090519
- International Application: PCT/JP2010/057815 WO 20100507
- International Announcement: WO2010/134434 WO 20101125
- Main IPC: C07C51/42
- IPC: C07C51/42

Abstract:
The objective of the present invention is to provide a process for producing highly pure (meth) acrylic acid stably and efficiently with crystallization. The process for production of (meth)acrylic acid according to the present invention is characterized in comprising the steps of cooling a crude (meth)acrylic acid solution in a crystallization apparatus until the temperature of a cooling medium discharged from the crystallization apparatus is stabilized in the range of higher than the solidification point of the crude (meth)acrylic acid solution in the crystallization apparatus and not more than the solidification point plus 5° C.; then bringing the crude (meth)acrylic acid solution in the crystallization apparatus to a supercooled condition by setting the temperature of a cooling medium supplied to the crystallization apparatus at the temperature of not more than the solidification point of the crude (meth)acrylic acid solution minus 1° C.; and crystallizing (meth)acrylic acid from the crude (meth)acrylic acid solution.
Public/Granted literature
- US20120046495A1 PROCESS FOR PRODUCTION OF (METH) ACRYLIC ACID Public/Granted day:2012-02-23
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