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发明公开
CN1583819A 一种在超临界CO2流体中合成聚乳酸的方法 失效 - 权利终止

一种在超临界CO2流体中合成聚乳酸的方法
摘要：
本发明提供一种在超临界CO2流体中合成聚乳酸的方法。该方法通过调节反应釜中的单体丙交酯浓度、催化剂和共溶剂及其浓度、反应温度、CO2压力、反应时间、CO2的纯度等条件，能得到不同分子量及分布的聚乳酸。反应后还可利用超临界CO2萃取去除未反应完单体、催化剂和共溶剂等低分子物质。利用本发明合成的聚乳酸不需要再进行任何后处理，就可直接用来后加工。这种反应过程既不会对产物及环境带来污染，又省去了一系列后处理工序，只需通过减压操作，就可以实现产物与CO2溶剂的分离。充分适应了当今世界绿色环保、节省资源的要求。
摘要（英）：

A synthesis of polylactic acid in super-critical CO2 fluids iscarried out by: adjusting mono-lactide' concentration in a reaction kettle, catalyst and cosolving reagent and its concentration, adjusting reaction temperature, CO2 pressure, reaction time, CO2 purity etc. conditions, to obtain polylactic acid with different molecular weights, and extracting and removing the non-reacted monomers, catalysts and cosolving reagents etc. low molecular weight substances with super-critical CO2 after reaction. The polylactic acid is obtained without post treatment and direct post processing. This invention has advantages of without pollution for products and environment, saving post treatment works, only through depressing operation to realize separating for products and CO2 solvent. It meets demands of current green world environmental protection and saves resources.

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