PROCESSES FOR PURIFYING DIARYL CARBONATES
    32.
    发明申请
    PROCESSES FOR PURIFYING DIARYL CARBONATES 有权
    纯化二氧化碳的方法

    公开(公告)号:US20090137832A1

    公开(公告)日:2009-05-28

    申请号:US12274776

    申请日:2008-11-20

    IPC分类号: C07C68/06

    摘要: Processes comprising: transesterifying a dialkyl carbonate and an aromatic hydroxyl compound in the presence of a transesterification catalyst to provide a diaryl carbonate product comprising the transesterification catalyst as an impurity; subjecting the diaryl carbonate product to distillation in a first distillation column having an upper part and a lower part, wherein the upper part comprises a rectifying section and the lower part comprises a stripping section; and withdrawing a first sidestream from the first distillation column, wherein the first sidestream comprises a purified diaryl carbonate.

    摘要翻译: 方法包括:在酯交换催化剂存在下酯交换碳酸二烷基酯和芳族羟基化合物,得到包含酯交换催化剂作为杂质的碳酸二芳酯产物; 在具有上部和下部的第一蒸馏塔中对碳酸二芳基酯进行蒸馏,其中上部包括精馏段,下部包含汽提段; 以及从所述第一蒸馏塔排出第一侧流,其中所述第一侧流包含纯化的碳酸二芳基酯。