发明申请
- 专利标题： Production Method of N-Vinyl-2-Pyrrolidone
- 专利标题（中）： N-乙烯基-2-吡咯烷酮的制备方法
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申请号： US11918228申请日： 2006-04-07
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公开(公告)号： US20090088579A1公开(公告)日： 2009-04-02
- 发明人: Hideto Sugiura , Toru Inaoka , Shigeyuki Nozaki , Yoshihisa Oka
- 申请人： Hideto Sugiura , Toru Inaoka , Shigeyuki Nozaki , Yoshihisa Oka
- 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
- 优先权： JP2005-113523 20050411; JP2005-218778 20050728
- 国际申请： PCT/JP2006/307892 WO 20060407
- 主分类号： C07D207/267
- IPC分类号： C07D207/267
摘要：
High-purity NVP can be produced by comprising at least two crystallization processes and supplying the mother liquor from the first crystallization process to the second crystallization process.Further, high-purity NVP can be obtained continuously and stably without plugging caused by depositing of crystals on the heat transfer surface of a crystallizer by controlling the water content in a feed NVP solution at the inlet of the crystallizer so as to be not lower than 0.7% by weight and not higher than 10% by weight.