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1. 发明授权

US5175355A Improved process for recovery of purified terephthalic acid 失效
标题翻译：改进纯化对苯二甲酸的回收方法
公开(公告)号：US5175355A
公开(公告)日：1992-12-29
申请号：US810725
申请日：1991-12-18
申请人： Debra J. Streich , Diane J. Graziano , Sandra K. Schiller , Roger J. Grimm
发明人： Debra J. Streich , Diane J. Graziano , Sandra K. Schiller , Roger J. Grimm
IPC分类号： C07C63/26 , C07C51/42 , C07C51/43 , C07C51/47 , C07F9/46
CPC分类号： C07F9/46 , C07C51/43
摘要： A process is disclosed for preparation of purified terephthalic acid containing 200 ppmw or less of p-toluic acid. A filter cake of purified terephthalic acid is prepared by filtering, under a differential pressure of about or greater than 0.5 psi over the system pressure and a temperature within the range of from about 100.degree. C. to about 205.degree. C., an aqueous slurry of purified terephthalic acid containing a solution of p-toluic acid. The aqueous solution of p-toluic acid remaining in the filter cake of purified terephthalic acid is displaced from the filter cake by water under a pressure gradient over the system pressure at a temperature within the range of from about 100.degree. C. to about 205.degree. C. Pressure flash evaporation of water remaining in the filter cake occurs upon release of the system pressure to lower pressure with consequent lower temperature. The crystalline terephthalic acid product containing 200 ppmw or less p-toluic acid can be dried under atmospheric pressure. Purified terephthalic acid is useful for the manufacture of polyesters from which clothing and related goods are made.
摘要翻译：公开了一种制备含有200ppmw或更少的对甲苯甲酸的纯对苯二甲酸的方法。纯化的对苯二甲酸的滤饼通过在系统压力和约100℃至约205℃范围内的温度下在约或大于0.5psi的压差下过滤来制备，水性浆料的含对苯甲酸溶液的纯对苯二甲酸。保留在纯化对苯二甲酸的滤饼中的对甲苯甲酸的水溶液在压力梯度下在压力梯度下在约100℃至约205℃的温度范围内从水中从滤饼中移出。 C.将系统压力释放到较低压力并随之降低温度时，会发生残留在滤饼中的水的压力闪蒸。含有200ppmw以下的对甲苯甲酸的结晶对苯二甲酸产物可以在大气压下干燥。纯化的对苯二甲酸可用于制造服装和相关商品的聚酯。

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