Method and apparatus for producing polyhydroxy carboxylic acid
    5.
    发明授权
    Method and apparatus for producing polyhydroxy carboxylic acid 有权
    多羟基羧酸的制备方法和装置

    公开(公告)号:US07723540B2

    公开(公告)日:2010-05-25

    申请号:US11770165

    申请日:2007-06-28

    IPC分类号: C07C59/08 C07C59/10

    摘要: The object is to provide a method and apparatus for producing a polyhydroxy carboxylic acid according to which an annular dimer can be efficiently obtained in the production of polyhydroxy carboxylic acid which is small in distribution breadth of molecular weight in depolymerization and opening ring polymerization steps. There are provided a depolymerization device 11 which depolymerizes hydroxy carboxylic acid or a polycondensate thereof into an annular dimer, a upper distillation column 13 which condenses the annular dimer vaporized in the depolymerization device 11, and lower distillation column 12 which refluxes the annular dimer and is provided between the depolymerization device 11 and the upper distillation column 13, said depolymerization device 11 having a polycondensate feed opening 54 and an annular dimer discharge opening 55 which are provided at a casing 50, a liquid film being formed inside the casing 50 and heated by a heating part.

    摘要翻译: 本发明的目的是提供一种制备多羟基羧酸的方法和装置,根据该方法和装置,在解聚和开环聚合步骤中分子量分布宽度小的多羟基羧酸的生产中可以有效地获得环状二聚体。 提供了将羟基羧酸或其缩聚物解聚成环状二聚体的解聚装置11,使在解聚装置11中蒸发的环状二聚体冷凝的上部蒸馏塔13和回流该环状二聚体的下馏分12, 在解聚装置11和上部蒸馏塔13之间,所述解聚装置11具有设置在壳体50处的缩聚物供给口54和环状二聚体排出口55,液体膜形成在壳体50的内部并被加热 加热部件。