Process for the preparation of polycarbonate
    13.
    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。

    PROCESS FOR THE PRODUCTION OF DIARYL CARBONATES AND TREATMENT OF ALKALICHLORIDE SOLUTIONS RESULTING THEREFROM
    17.
    发明申请
    PROCESS FOR THE PRODUCTION OF DIARYL CARBONATES AND TREATMENT OF ALKALICHLORIDE SOLUTIONS RESULTING THEREFROM 审中-公开
    生产二氧化碳的方法和治疗其结果的碱性溶液

    公开(公告)号:US20080053836A1

    公开(公告)日:2008-03-06

    申请号:US11849542

    申请日:2007-09-04

    IPC分类号: C25B3/02

    摘要: Processes comprising: (a) reacting phosgene and a monohydroxyl aryl compound in the presence of a suitable catalyst to form a diaryl carbonate and a solution comprising an alkali chloride; (b) separating the diaryl carbonate from the solution; (c) adjusting the pH of the solution to a value of less than or equal to 8 to form a pH-adjusted solution; (d) treating the pH-adjusted solution with an adsorbent to form a treated solution; (e) subjecting at least a portion of the treated solution to electrochemical oxidation to form chlorine and an alkali hydroxide solution; and (f) recycling at least a portion of one or both of the chlorine and the alkali hydroxide solution.

    摘要翻译: 方法包括:(a)在合适的催化剂存在下使光气和单羟基芳基化合物反应,形成碳酸二芳酯和包含碱金属氯化物的溶液; (b)从溶液中分离碳酸二芳酯; (c)将溶液的pH调节至小于或等于8的值以形成pH调节的溶液; (d)用吸附剂处理pH调节的溶液以形成处理溶液; (e)使经处理的溶液的至少一部分进行电化学氧化以形成氯和碱金属氢氧化物溶液; 和(f)回收氯和氢氧化碱溶液中的一种或两种的至少一部分。