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    • 3. 发明授权
    • Method for purification of cyclic ester
    • 环酯的纯化方法
    • US08404868B2
    • 2013-03-26
    • US12449669
    • 2008-01-28
    • Kazuyuki YamaneTomohiro HoshiTomoyuki Ogawa
    • Kazuyuki YamaneTomohiro HoshiTomoyuki Ogawa
    • C07D321/00C07D319/00
    • C07D319/12
    • A method of purifying a cyclic ester, comprising: mixing a co-distillated liquid comprising a cyclic ester produced by heating depolymerization of a hydroxycarboxylic acid oligomer in the presence of a depolymerization solvent and the depolymerization solvent with an organic solvent for washing which is mutually soluble with the depolymerization solvent and has a lower boiling point than the cyclic ester; subjecting the resultant mixture liquid to liquid-liquid separation into an organic solvent phase containing the depolymerization solvent and a cyclic ester phase containing the organic solvent; and then evaporating the organic solvent from the cyclic ester phase containing the organic solvent to recover the cyclic ester containing a reduced amount of the depolymerization solvent. As a result, purified cyclic ester is recovered at high heat efficiency, purification efficiency and operation efficiency, from the co-distillate liquid containing the depolymerization solvent and the cyclic ester from the depolymerization system for thermal decomposition of the hydroxycarboxylic acid oligomer in the presence of the depolymerization solvent.
    • 一种环状酯的提纯方法,其特征在于,包括:在解聚溶剂和解聚溶剂的存在下,通过将羟基羧酸低聚物的解聚反应与溶解有机溶剂进行溶解而得到的包含环状酯的共蒸馏液, 具有解聚溶剂并且具有比环酯低的沸点; 将所得混合液进行液 - 液分离成含有解聚溶剂的有机溶剂相和含有有机溶剂的环状酯相; 然后从含有机溶剂的环状酯相中蒸发有机溶剂,回收含有减少量的解聚溶剂的环状酯。 结果,从含有解聚溶剂的共馏出液和来自用于羟基羧酸低聚物的热分解的解聚体系的环状酯在高热效率,净化效率和操作效率下,在存在 解聚溶剂。