公开(公告)号：US5567842A

公开(公告)日：1996-10-22

申请号：US550400

申请日：1995-10-30

申请人： Yoshiaki Izumisawa ,  Tukasa Kawahara ,  Akihiko Toyosawa

发明人： Yoshiaki Izumisawa ,  Tukasa Kawahara ,  Akihiko Toyosawa

IPC分类号： C07C51/43

CPC分类号： C07C51/43

摘要： A process for producing terephthalic acid, which comprises dissolving crude terephthalic acid in an aqueous medium, contacting it with a platinum group metal catalyst for purification under a temperature condition of from 260.degree. to 320.degree. C., crystallizing terephthalic acid from the aqueous solution of terephthalic acid by cooling the aqueous solution stepwise in a plurality of crystallizers connected in series, in such a manner that in a first crystallization zone, the crystallization temperature is adjusted to a level within a range of from 240.degree. to 260.degree. C. and agitating is carried out by impeller with a power requirement of impeller within a range of from 0.4 to 10 kw/m.sup.3, and then, in a second crystallization zone, the crystallization temperature is adjusted to a level within a range of from 180.degree. to 230.degree. C., which is lower by from 20.degree. to 60.degree. C. than the crystallization temperature in the first crystallization zone, followed by solid-liquid separation, and drying the separated terephthalic acid crystals to obtain terephthalic acid particles wherein the proportion of particles having particle sizes exceeding 210 .mu.m is at most 10 wt %.

摘要翻译： 一种对苯二甲酸的制造方法，其包括将粗对苯二甲酸溶解在水性介质中，使其与铂族金属催化剂接触，在260〜320℃的温度条件下进行纯化，从对苯二甲酸的水溶液中 对苯二甲酸通过在多个连续串联的结晶器中逐步冷却水溶液，使得在第一结晶区中，将结晶温度调节至240-260℃的范围内并搅拌 由叶轮的功率要求在0.4〜10kw / m 3的范围内由叶轮进行，然后在第二结晶区中将结晶温度调节至180〜230℃的范围内 C.比第一结晶区的结晶温度低20〜60℃，然后进行固液分离，干燥t 将对苯二甲酸晶体分离，得到粒径超过210μm的粒子的比例为10重量％以下的对苯二甲酸粒子。