反应精馏法催化合成邻苯二甲酸二异辛酯

Reactive Distillation Synthesis of Diisooctyl Phthalate Catalyzed by Sulfuric Acid

研究了反应精馏法催化合成邻苯二甲酸二异辛酯系列工艺条件,发现该方法有生产工艺简单,反应条件温和,反应时间短,产品中副产物少,转化率高,产品质量较好,且可以在反应的同时,对产物进行有效的分离等优点。最佳工艺条件;催化剂硫酸的用量占总投料量的3‰、釜温控制178℃、柱温控制1 63℃,m(苯酐):m(异辛醇)为1:2．7,回流比为1:1, 反应时间为1．5 h,反应床层高度为2．7 m时,邻苯二甲酸酐的转化率可达到99％。

Studied reactive distillation-synthesis of diisooctyl phthalate catalyzed by sulfuric acid, there are many advantages including simplicity in product treament, gentle reaction condition, little byproduct, short time of reaction, high translation. The product is of good quality; it can be separated from reaction product at the same time. The optimum reaction conditions are as follow： catalyst amount, reaction time, temperature, high of bed, mass ratio, circumfluence ratio are 3‰, 1.5 h, 178 ℃ （163 ℃）, 2.7 m, 1 ： 2.7, 1 ： 1. The conversion of phthalic anhydride in the synthesis of DIOP is up to 99%.