发明名称 |
Acetic anhydride, method of purifying crude acetic anhydride, and method of producing polyoxytetramethylene glycol using acetic anhydride |
摘要 |
The present invention provides acetic anhydride, a method of purifying crude acetic anhydride, and a method of producing polyoxytetramethylene glycol using acetic anhydride. A method of producing polyoxytetramethylene glycol by ring-opening-polymerizing tetrahydrofuran in the presence of acetic anhydride and an acid catalyst, wherein said ring-opening polymerization is conducted using acetic anhydride having a diketene concentration of 10 ppm or less to produce polyoxytetramethylene glycol.
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申请公布号 |
US6987201(B2) |
申请公布日期 |
2006.01.17 |
申请号 |
US20010788047 |
申请日期 |
2001.02.16 |
申请人 |
DAICEL CHEMICAL INDUSTRIES, LTD. |
发明人 |
NISHIOKA SEIJI;MAEDA RYOSUKE;FUKUI TOSHIFUMI;YAMASHITA MITSURU |
分类号 |
C07C51/573;C07C41/01;C07C41/34;C07C41/42;C07C43/04;C08G65/20 |
主分类号 |
C07C51/573 |
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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