Process for producing oligocarbonates
    4.
    发明授权
    Process for producing oligocarbonates 有权
    生产寡聚碳酸酯的方法

    公开(公告)号:US06835797B2

    公开(公告)日:2004-12-28

    申请号:US10103921

    申请日:2002-03-22

    IPC分类号: C08G6400

    CPC分类号: C08G64/307

    摘要: A continuous process for producing oligocarbonate is disclosed. The process entails in sequence the steps of a) reacting a dihydroxyaryl compound with a diaryl carbonate in the presence of a catalyst to obtain a melt and avoiding removal of released monohydroxyaryl compound and b) withdrawing the monohydroxyaryl compound by flash evaporation and c) heating the melt obtained under vacuum in an evaporator equipped with sump receiver and d) repeating at least once steps b) and then c) each at gradually increased temperatures and lowered pressures.

    摘要翻译: 公开了连续生产低聚碳酸酯的方法。 该方法按照以下步骤进行:a)在催化剂存在下使二羟基芳基化合物与碳酸二芳基酯反应,得到熔体,避免去除脱离的单羟基芳基化合物,和b)通过闪蒸蒸发除去单羟基芳基化合物,和c)加热 在装有贮槽接收器的蒸发器中在真空下获得熔体,d)重复至少一次步骤b),然后c)逐渐升高温度和降低的压力。