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    • 2. 发明申请
    • PROCESS FOR PRODUCING POLYTRIMETHYLENE TEREPHTHALATE
    • 生产聚苯二甲酸三癸酯的方法
    • WO0208310A3
    • 2002-08-15
    • PCT/EP0108281
    • 2001-07-17
    • SHELL INT RESEARCH
    • KELSEY DONALD ROSSSCARDINO BETTY MARROU
    • C08G63/183C08G63/78C08G63/83C08G63/89
    • C08G63/83C08G63/183C08G63/78
    • A process for the polymerization of polytrimethylene terephthalate by esterification of terephthalic acid or dimethylterephthalate with 1,3-propane diol, precondensation of the esterification product to produce a precondensation product, and polycondensation of the precondensation product to produce polytrimethylene terephthalate and, as a byproduct, the cyclic dimer of terephthalic acid or dimethyl terephthalate and 1,3-propane diol, comprising: (a) recovering the cyclic dimer from the polymerization, (b) reacting from 0.5 to 25 percent by weight of the cyclic dimer in 1,3-propane diol in the presence of from 0.1 to 10 percent by weight of the cyclic dimer of a basic catalyst for five minutes to 24 hours at 50 to 210 ÙC, (c) optionally neutralizing the basic catalyst in the reaction product of (b), and (d) recycling the reaction product into the polymerization process.
    • 通过对苯二甲酸或对苯二甲酸二甲酯与1,3-丙二醇的酯化反应来聚合聚对苯二甲酸丙二醇酯的方法,酯化产物的预缩合以产生预缩合产物,以及预缩合产物的缩聚产生聚对苯二甲酸丙二醇酯,作为副产物, 对苯二甲酸或对苯二甲酸二甲酯的环状二聚体和1,3-丙二醇,包括:(a)从聚合中回收环状二聚体,(b)使0.5至25重量%的环状二聚体在1,3- 丙烷二醇在0.1至10重量%的碱性催化剂的环状二聚体的存在下在50至210℃下反应5分钟至24小时,(c)任选地中和(b)的反应产物中的碱性催化剂, 和(d)将反应产物再循环到聚合过程中。