发明名称 |
METHOD AND APPARATUS FOR PRODUCING AROMATIC POLYCARBONATE |
摘要 |
There is provided a technique for producing an aromatic polycarbonate which undergoes no deterioration in quality in a gear pump, has excellent hue and contains a small amount of foreign materials even when a production plant is scaled up. <??>In producing the aromatic polycarbonate by melt-polycondensation, a molten polycondensate is fed continuously into a shaft seal portion of a self-lubricating gear pump disposed for transporting the polycondensate from a polycondensation vessel such that the following expressions: <DF>Q/S >/= 0.1 (cm/sec) </DF> wherein Q is a flow rate (cm<3>/sec) of the polycondensate, and S is a cross sectional area (cm<2>) of a passage provided for feeding the polycondensate to the shaft seal portion, and <DF>D </= 2.9W<1/3> </DF> wherein D is an internal diameter (cm) of a pipe, and W is a flow rate, are satisfied, thereby operating the gear pump. A polycondensation vessel therefor is also disclosed.
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申请公布号 |
EP1361242(A1) |
申请公布日期 |
2003.11.12 |
申请号 |
EP20010999595 |
申请日期 |
2001.12.05 |
申请人 |
TEIJIN LIMITED |
发明人 |
MATSUMOTO, KYOSUKE;SIMONARU, MASASI;SAWAKI, TORU;SASAKI, KATSUSHI;KANEKO, KEIICHI |
分类号 |
C08G64/20;C08G64/30;(IPC1-7):C08G64/30 |
主分类号 |
C08G64/20 |
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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