发明名称 |
Production Method of N-Vinyl-2-Pyrrolidone |
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.
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申请公布号 |
US2009088579(A1) |
申请公布日期 |
2009.04.02 |
申请号 |
US20060918228 |
申请日期 |
2006.04.07 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
SUGIURA HIDETO;INAOKA TORU;NOZAKI SHIGEYUKI;OKA YOSHIHISA |
分类号 |
C07D207/267 |
主分类号 |
C07D207/267 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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