PROCESS FOR CONTINUOUSLY PREPARING DIALKYL CARBONATE
    7.
    发明申请
    PROCESS FOR CONTINUOUSLY PREPARING DIALKYL CARBONATE 审中-公开
    连续制备碳酸氢钾的方法

    公开(公告)号:US20120130110A1

    公开(公告)日:2012-05-24

    申请号:US13280423

    申请日:2011-10-25

    IPC分类号: C07C68/08

    CPC分类号: C07C68/08 C07C69/96

    摘要: The present invention relates to a process comprising purifying dialkyl carbonates of the formula (II) in one or more columns in the presence of an alkylene oxide of the formula (V) and of an alkyl alcohol of the formula (IV) wherein R1 and R2 represent, independently of one another, linear or branched, substituted or unsubstituted C1-C6-alkyl, R3 and R4 represent, independently of one another, hydrogen, substituted or unsubstituted C1-C4-alkyl, substituted or unsubstituted C2-C4-alkenyl or substituted or unsubstituted C6-C12-aryl, and R5 represents a straight-chain or branched C1-C4-alkyl; and wherein the mean residence time of the dialkyl carbonate in the column(s) is from 0.3 h to 3 h.

    摘要翻译: 本发明涉及一种方法,其包括在式(V)的烯化氧和式(IV)的烷基醇存在下,在一个或多个塔中纯化式(II)的碳酸二烷基酯,其中R 1和R 2 彼此独立地表示直链或支链的取代或未取代的C 1 -C 6烷基,R 3和R 4彼此独立地表示氢,取代或未取代的C 1 -C 4 - 烷基,取代或未取代的C 2 -C 4 - 烯基或 取代或未取代的C 6 -C 12 - 芳基,R 5表示直链或支链C 1 -C 4烷基; 并且其中所述柱中碳酸二烷基酯的平均停留时间为0.3h至3h。

    Processes for purifying diaryl carbonates
    10.
    发明授权
    Processes for purifying diaryl carbonates 有权
    净化碳酸二芳基酯的方法

    公开(公告)号:US08022240B2

    公开(公告)日:2011-09-20

    申请号:US12274776

    申请日:2008-11-20

    IPC分类号: C07C67/02

    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。