发明授权
- 专利标题: Method for distilling (meth)acrylic acid and/or the ester thereof
- 专利标题(中): 蒸馏(甲基)丙烯酸和/或其酯的方法
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申请号: US10840252申请日: 2004-05-07
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公开(公告)号: US07319167B2公开(公告)日: 2008-01-15
- 发明人: Sei Nakahara , Kazuhiko Sakamoto , Yukihiro Matsumoto
- 申请人: Sei Nakahara , Kazuhiko Sakamoto , Yukihiro Matsumoto
- 申请人地址: JP Osaka
- 专利权人: Nippon Shokubai Co., Ltd.
- 当前专利权人: Nippon Shokubai Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Wenderoth, Lind & Ponack, L.L.P.
- 优先权: JP2003-131509 20030509
- 主分类号: C07C51/42
- IPC分类号: C07C51/42
摘要:
A method for distilling (meth)acrylic acid and/or the ester thereof by withdrawing vapor generated in a distillation column by distillation from the top of the column, condensing the vapor to give a condensate, and circulating part of the condensate as reflux liquid into the distillation column from the top thereof, comprising the step of adding a polymerization inhibitor to said condensate and said reflux liquid. This method enables maintaining the purity and quality of (meth)acrylic acid and/or the ester thereof at a certain level or higher, suppressing generation of polymers in the rectification column and suppressing polymerization of the condensate obtained by distillation in the incident facilities of the column such as condenser, condensate tank, and the like. In addition, the method enables reduction in the amount of polymerization inhibitor used while suppressing polymerization in the intermediate distillation columns (except the final rectification column).