发明名称 |
PURIFICATION OF RECYCLED 1,3-PROPANEDIOL DURING POLYESTER PREPARATION |
摘要 |
A process for preparing a 1,3-propanediol-based polyester in which a carbonyl-containing 1,3-propanediol stream is purified for reuse of the 1,3-propanediol. The process involves reacting, under condensation polymerization conditions, terephthalic acid and a molar excess of 1,3-propanediol, with distillation and condensation of a major portion of the unreacted 1,3-propanediol. To this condensed stream is added a sufficient amount of base to raise the pH to a value greater than 7, and from this base-containing condensate the 1,3-propanediol is distilled and recycled to the polymerization reaction.
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申请公布号 |
WO0044809(A1) |
申请公布日期 |
2000.08.03 |
申请号 |
WO2000EP00735 |
申请日期 |
2000.01.28 |
申请人 |
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. |
发明人 |
KELSEY, DONALD, ROSS;SCARDINO, BETTY, MARROU;ZRONEK, STEVEN, CHARLES |
分类号 |
C07C29/88;C08G63/183;C08G63/78;C08G63/84;(IPC1-7):C08G63/78 |
主分类号 |
C07C29/88 |
代理机构 |
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代理人 |
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地址 |
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