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1. 发明申请

WO2002094757A1 PRODUCTION, PURIFICATION AND POLYMERIZATION OF DICARBOXYLIC ACIDS 审中-公开
标题翻译：二羧酸的生产，纯化和聚合
公开(公告)号：WO2002094757A1
公开(公告)日：2002-11-28
申请号：PCT/US2002/013789
申请日：2002-05-01
申请人： EXXONMOBIL CHEMICAL PATENTS INC.
发明人： RAO, Krishna, K. , SELLEN, Russell, D. , FENG, Xiaobing , SPANSWICK, James , HUBER, William, F.
IPC分类号： C07C51/493
CPC分类号： C07C51/493 , C07C63/38
摘要： This invention provides a process for purifying the crude aromatic dicarboxylic acids produced by oxidation of dialkyl aromatic hydrocarbons and for using the purified acids in the preparation of polyethylene terephthalate, polyethylene naphthalate and other polyesters. The invention simplifies the manufacturing process by converting the crude aromatic acids into bis-glycol esters in an esterification reactor 4, from which the esterified partial oxidation impurities present in the oxidation product are removed by distillation in distillation tower 5. After removal of the volatile impurities, the dicarboxylic acid esters can separated by distillation in distillation tower 6 or by crystallization and converted to polyesters by polycondensation. The volatile impurities reoved as overhead from tower 5 can be recycled as stream 16 to the oxidation reactor where they act as oxidation promoters thereby optionally allowing for a bromine-free oxidation process for dialkyl aromatic hydrocarbons.
摘要翻译：本发明提供了一种净化由二烷基芳烃氧化产生的粗芳族二羧酸和在制备聚对苯二甲酸乙二醇酯，聚萘二甲酸乙二醇酯和其它聚酯中使用纯化酸的方法。本发明通过在酯化反应器4中将粗芳香酸转化为双 - 二醇酯来简化制造过程，通过在蒸馏塔5中蒸馏除去存在于氧化产物中的酯化部分氧化杂质。除去挥发性杂质，二羧酸酯可以通过在蒸馏塔6中蒸馏或通过结晶分离，并通过缩聚转化成聚酯。从塔架5回收的作为塔顶馏出物的挥发性杂质可以作为料流16再循环到氧化反应器中，其中它们用作氧化促进剂，从而任选地允许二烷基芳族烃的无溴氧化方法。

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