非均相催化水合法合成乙二醇反应动力学研究

Study of Kinetics of Heterogeneous Catalytic Hydration to Ethylene Glycol

在等温积分反应器中,温度70-90℃,压力1.5-1.8 MPa,水比4-6,空速0.5-4 h-1的实验条件下,以自制的HCO3-1型阴离子树脂NS-1为催化剂,对环氧乙烷(EO)非均相催化水合法合成乙二醇(EG)的反应进行了研究。根据实验数据拟合出了反应动力学方程,与利用Langmuir吸附理论建立的反应动力学方程进行了比较。研究结果表明:在树脂催化剂NS-1作用下,反应速率对EO的浓度具有1.5级反应特征,其表观活化能为23.8 kJ/mol,指前因子为2.4×104mol-0.5.L1.5.(g.h)-1。与非催化水合反应相比较,NS-1树脂催化剂的使用大大降低了反应活化能,提高了反应速率。

The kinetics of heterogeneous catalytic hydration to ethylene glycol on anion--exchange resin catalyst NS-1 in the HCO3^- form, was studied in an isothermal integral reactor under the reaction conditions of 70--90 ℃, the pressure of 1.5--1.8 MPa, the initial mass ratio of water and EO 4--6, the space velocity of 0.5--4 h^-1. According to the experimental findings the kinetic model was fitted and was compared with the kinetic model proposed by the Langmuir. The results showed that the reaction rate to con- centration of EO had the 1.5 order reaction, which the activation energy was 23.8 kJ/mol and the pre--exponential constant was 2.4×10^4 mol^-0.5.L1.5·（g·h）^-1. Compared with the non--catalytic hydration, the anion exchange resin NS--1 could sharply decrease the activity energy and heighten the reaction rate.