杂多酸催化合成邻苯二甲酸二正辛酯的研究

Study on catalytic synthesis of di-n-octyl phthalate by heteropolyacid as a catalyst

研究了以邻苯二甲酸酐和正辛醇为原料,用自制的杂多酸为催化剂合成性能优良的增塑剂邻苯二甲酸二正辛酯.经探索性试验和正交试验确定了合成邻苯二甲酸二正辛酯的较佳工艺条件:酐醇摩尔比为1.0:2.3,其中磷钨杂多酸催化剂用量为1.5 g,邻苯甲酸酐1 mol;带水剂(甲苯)用量为120 mL,邻苯甲酸酐1 mol;回流反应1.5 h.在此所选择的工艺条件下,邻苯二甲酸二正辛酯的合成收率达98.02%～98.80%(以邻苯二甲酸酐投料计).

Di-n-octyl phthalate, a good plasticizer, has been synthesized by using n-octanol and phthalic anhydride as starting materials in the presence of heteropolyacid （HPA） catalyst. The optimizing test of the operation conditions was also established. The optimum reaction conditions, under which the yield of di-n-octyl phthalate is about 98.02-98.80%, are as follows , molar ratio ： phthalic anhydride ; alcohol= 1.0 ： 2. 3, weight of phospho-tungtic acid catalyst （HPW）, 1.5 g/l tool phthalic anhydride, reaction time. 1.5 h, toluene as water-taken agent.