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    • 23. 发明申请
    • PROCESSES FOR PREPARING DIARYL AND/OR ALKYLARYL CARBONATES FROM DIALKYL CARBONATES
    • 从碳酸二甲酯制备二元和/或烷基碳酸的方法
    • US20090076293A1
    • 2009-03-19
    • US12210279
    • 2008-09-15
    • Andre DuxPieter OomsJohann RechnerMatthias BohmKaspar HallenbergerGeorg RongeJohan Vanden Eynde
    • Andre DuxPieter OomsJohann RechnerMatthias BohmKaspar HallenbergerGeorg RongeJohan Vanden Eynde
    • C07C68/06
    • C07C68/06C07C69/96
    • Processes comprising: reacting a dialkyl carbonate and an aromatic hydroxy compound in the presence of a transesterification catalyst in a first reaction column, the first reaction column comprising a top section, a bottom section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; feeding a bottom product from the first reaction column to a further reaction column; the bottom product comprising a diaryl carbonate, an alkylaryl carbonate, or both, and residual unreacted dialkyl carbonate and aromatic hydroxy compound; the further reaction column comprising a top section, a rectifying section in an upper portion of the column and a reaction zone below the rectifying section; and reacting the residual reacted dialkyl carbonate and aromatic hydroxy compound in the further reaction column; feeding a process stream to a distillation column, the process stream comprising a mixture of unreacted dialkyl carbonate and one or more reaction-product alcohols drawn from the first reaction column, the further reaction column, or both, such that the unreacted dialkyl carbonate is separated from the one or more reaction-product alcohols; and recycling the separated, unreacted dialkyl carbonate to the first reaction column; wherein the further reaction column comprises one or more condensers, and heat of condensation from the one or more condensers is fed back into the process.
    • 方法包括:在第一反应塔中的酯交换催化剂存在下使碳酸二烷基酯和芳族羟基化合物反应,所述第一反应塔包括塔的上部的顶部,底部,精馏段和 整流段下方的反应区; 将底部产物从第一反应塔进料至另一反应塔; 底部产物包含碳酸二芳基酯,碳酸二烷基酯或二者,和残留的未反应的碳酸二烷基酯和芳族羟基化合物; 所述另外的反应塔包括顶部,所述塔的上部的精馏部和所述精馏部下方的反应区; 并使残留的反应后的碳酸二烷基酯和芳香族羟基化合物反应进一步反应塔中; 将工艺流输送到蒸馏塔,所述工艺流包含未反应的碳酸二烷基酯和从第一反应塔,进一步的反应塔或两者中抽出的一种或多种反应产物醇的混合物,使得未反应的碳酸二烷基酯被分离 由一种或多种反应产物醇; 并将分离的未反应的碳酸二烷基酯再循环到第一反应塔中; 其中所述另外的反应塔包括一个或多个冷凝器,并且将来自所述一个或多个冷凝器的冷凝热反馈到所述方法中。
    • 27. 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。