发明名称 |
Process for the multistage generation of vacuum for polyester production |
摘要 |
Process for multi-stage generation of a vacuum and condensation and recycling of the vapors of polycondensation in the production of polyester, where the last stage includes a liquid ring pump compressing to atmospheric pressure, a cooler and a degasifier tank. The process also includes at least two preceding stages each using a glycol vapor jet that is operated with superheated glycol vapor at a pressure in the range of 0.8 to 1.0 bar abs. and a downstream glycol spray condenser whose operating conditions are regulated to condense a maximum quantity of glycol and at the same time causing the low-boiling reaction by-products including water to remain in the gas phase.
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申请公布号 |
US5466776(A) |
申请公布日期 |
1995.11.14 |
申请号 |
US19950386113 |
申请日期 |
1995.02.09 |
申请人 |
ZIMMER AKTIENGESELLSCHAFT |
发明人 |
KRAUTSTRUNK, JUERGEN;MACKENSEN, KLAUS |
分类号 |
C08F2/00;C08G63/78;(IPC1-7):C08F2/00;C08G63/00;C08G85/00 |
主分类号 |
C08F2/00 |
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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