发明名称 |
Process for the preparation of aliphatic oligocarbonate diols from dimethyl carbonate and aliphatic diols |
摘要 |
The present invention relates to a process for the preparation of aliphatic oligocarbonate diols by a) transesterifying dimethyl carbonate with aliphatic diols in the presence of soluble transesterification catalysts in a gas-liquid countercurrent apparatus to form oligocarbonates until the degree of conversion of the initial dimethyl carbonate is more than 80% and b) removing methanol and traces of dimethyl carbonate in an apparatus which generates gas bubbles in the oligocarbonates until the degree of capping of the terminal OH groups with methoxycarbonyl groups is less than 5%.
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申请公布号 |
US6156919(A) |
申请公布日期 |
2000.12.05 |
申请号 |
US19990461832 |
申请日期 |
1999.12.15 |
申请人 |
BAYER AKTIENGESELLSCHAFT |
发明人 |
LANGER, REINHARD;BUYSCH, HANS-JOSEF;HOVESTADT, WIELAND;MELCHIORS, MARTIN |
分类号 |
B01J31/02;C07B61/00;C07C68/06;C07C68/08;C07C69/96;C08G64/30;(IPC1-7):C07C68/06 |
主分类号 |
B01J31/02 |
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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