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    • 4. 发明授权
    • Process for producing polycarbonate
    • 生产聚碳酸酯的方法
    • US06703473B2
    • 2004-03-09
    • US10038953
    • 2002-01-02
    • Uwe HucksKaspar HallenbergerSilke KratschmerMichael PreinSteffen Kühling
    • Uwe HucksKaspar HallenbergerSilke KratschmerMichael PreinSteffen Kühling
    • C08G6400
    • C08G64/406C08G64/307
    • An improvement to the melt transesterification reaction of diaryl carbonate with dihydroxy aryl compound is disclosed. The improvement entails the following steps (i) introducing the resulting vapor stream at the mid-height of a first distillation column, and (ii) separating the vapor stream into a top product containing high purity monohydroxy aryl compound and a first bottom product, and (iii) recycling the high purity monohydroxy aryl compound of (ii) to the reaction, and (iv) introducing the first bottom product at mid-height of a second distillation column, and (v) separating said first bottom product into high boiling bottom by-product and overhead remaining constituents, and (vi) introducing the overhead remaining constituents at mid-height of a third distillation column, and (vii) separating said overhead remaining constituents into overhead low-boiling fractions and bottom or product side stream that contains diaryl carbonate product, and (viii) recycling the diaryl carbonate product directly to the transesterification reaction.
    • 公开了碳酸二芳酯与二羟基芳基化合物的熔融酯交换反应的改进。 改进需要以下步骤:(i)将所得蒸汽流引入第一蒸馏塔的中间高度,和(ii)将蒸汽流分离成含有高纯度单羟基芳基化合物和第一底部产物的顶部产物,以及 (iii)将(ii)的高纯度单羟基芳基化合物再循环到反应中,和(iv)在第二蒸馏塔的中间部分引入第一底部产物,和(v)将所述第一底部产物分离成高沸点底部 副产物和塔顶残留组分,和(vi)在第三蒸馏塔的中间高度引入塔顶剩余成分,和(vii)将塔顶剩余组分分离成塔顶低沸点馏分和底部或产物侧流,其含有 碳酸二芳基酯产物,和(viii)将碳酸二芳基酯产物直接再循环到酯交换反应中。