PROCESS FOR CONTINUOUSLY PREPARING DIALKYL CARBONATE
    17.
    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。

    Process for the preparation of polycarbonate
    18.
    发明授权
    Process for the preparation of polycarbonate 失效
    制备聚碳酸酯的方法

    公开(公告)号:US08173762B2

    公开(公告)日:2012-05-08

    申请号:US12829845

    申请日:2010-07-02

    IPC分类号: C08G64/00 C08G63/02

    CPC分类号: C08G64/307

    摘要: A combined process for the preparation of polycarbonate from bisphenols and diaryl carbonates, the monophenol liberated being reacted again for the preparation of the diaryl carbonate and the alkali metal halide forming in the preparation of the diaryl carbonate being converted by electrochemical oxidation, optionally over a gas diffusion electrode, into chlorine and alkali hydroxide solution, the chlorine being recycled into the preparation of the phosgene and the alkali hydroxide solution being recycled into the preparation of the diaryl carbonate.

    摘要翻译: 用于从双酚和碳酸二芳基酯制备聚碳酸酯的组合方法中,释放的单酚再次反应,用于制备碳酸二芳基酯和在制备碳酸二芳基酯时通过电化学氧化转化而形成的碱金属卤化物,任选地在气体 扩散电极,进入氯和碱性氢氧化物溶液中,氯被循环到光气的制备中,碱性氢氧化物溶液被循环到碳酸二芳基酯的制备中。