发明名称 |
Equipment and method for producing polyhydroxycarboxylic acid |
摘要 |
<p>This invention provides an equipment and a method for producing polyhydroxycarboxylic acid whereby the yield of a starting material in the process can be improved. An equipment for producing polyhydroxycarboxylic acid, comprising a ring-opening polymerization apparatus, a liquid phase devolatilizing apparatus, and a drying apparatus, wherein: an indirect heat exchanger is connected to a vent gas discharge path of the liquid phase devolatilizing apparatus; the indirect heat exchanger captures a dispersed in-process substance containing hydroxycarboxylic acid cyclic dimers and transfers the substance to the ring-opening polymerization apparatus; a wet condenser and a hot well are connected to a vent gas discharge path of the indirect heat exchanger and that of the drying apparatus, respectively; the wet condenser captures a dispersed in-process substance containing the cyclic dimers with the use of a refrigerant containing hydroxycarboxylic acid corresponding to the cyclic dimers and transfers the substance to the hot well; the hot well causes hydrolysis of the cyclic dimers for generation of hydroxycarboxylic acid; the generated hydroxycarboxylic acid is mixed with a refrigerant and the mixture is circulated to the wet condenser; and hydroxycarboxylic acid is highly concentrated via circulation between the wet condenser and the hot well and then discharged, is provided.</p> |
申请公布号 |
EP2172506(A2) |
申请公布日期 |
2010.04.07 |
申请号 |
EP20090010669 |
申请日期 |
2009.08.19 |
申请人 |
HITACHI PLANT TECHNOLOGIES, LTD. |
发明人 |
KAMIKAWA, MASAYUKI;MATSUO, TOSHIAKI;OKAMOTO, NARUYASU;OKA, KENICHIRO;KONDO, TAKEYUKI |
分类号 |
C08G63/06;C08G63/08;C08G63/78 |
主分类号 |
C08G63/06 |
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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