发明名称 |
Method for refining (meth)acrylic acid |
摘要 |
This invention relates to a method for preventing (meth)acrylic acid from polymerizing during the course of distillation. The method provides for refining (meth)acrylic acid by a procedure including the steps of feeding a mixed gas obtained by catalytic gas phase oxidation of propylene and/or acrolein with a molecular oxygen-containing gas or a mixed gas obtained by catalytic gas phase oxidation of at least one compound of isobutylene, t-butyl alcohol, or methacrolein with a molecular oxygen-containing gas, to a (meth)acrylic acid collection column, collecting a (meth)acrylic acid-containing solution from the mixed gas, and feeding the (meth)acrylic acid-containing solution to a distillation column while maintaining the total concentration of aldehydes of 2-4 carbon atoms and acetone in the solution at a level of not more than 2000 ppm based on the amount of (meth)acrylic acid.
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申请公布号 |
US6540881(B1) |
申请公布日期 |
2003.04.01 |
申请号 |
US20000532225 |
申请日期 |
2000.03.22 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
SAKAMOTO KAZUHIKO;UENO KOUJI;NAKAHARA SEI;UEOKA MASATOSHI |
分类号 |
C07C51/235;C07C51/23;C07C51/25;C07C51/44;C07C51/50;C07C57/07;(IPC1-7):B01D3/42;C07C51/21 |
主分类号 |
C07C51/235 |
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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