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Continuous process for preparing diaryl esters of carbonic acid 1997/29
Continuous process for preparing diaryl esters of carbonic acid 1997/29
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机译:连续制备碳酸二芳基酯的方法[1997/29]
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摘要
A two stage interfacial polycondensation process for the production of carbonic acid diaryl ester is disclosed. The invention concerns an improvement to the process that entails forming in a first stage a reaction mixture that contains an inert solvent, at least one monophenol, phosgene, and aqueous alkali hydroxide solution, passing said reaction mixture to a second stage through at least one constriction at a velocity of 3 to 15 m/s under conditions designed to expose the mixture to a pressure drop of 0.1 to 2.5 bar, and in said second stage passing said mixture through at least one dispersing element at a velocity of 2 to 10 m/s under conditions designed to expose the mixture to a pressure drop of 0.1 to 0.5 bar. The resulting product is characterized by its purity and suitability for the manufacture of polycarbonates in the melt transesterification process.
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机译:公开了用于生产碳酸二芳基酯的两阶段界面缩聚方法。本发明涉及对方法的改进,该方法包括在第一阶段中形成包含惰性溶剂,至少一种单酚,光气和碱金属氢氧化物水溶液的反应混合物,使该反应混合物通过至少一个缩颈进入第二阶段。在设计为使混合物暴露于0.1至2.5 bar的压降的条件下,以3至15 m / s的速度,并且在所述第二阶段中,使混合物以2至10 m / s的速度通过至少一个分散元件s在旨在使混合物承受0.1至0.5 bar压降的条件下进行。所得产物的特征在于其纯度和适用于在熔融酯交换过程中制造聚碳酸酯的特性。
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