己二酸二甲酯合成反应动力学研究

Kinetics of synthesis of dimethyl adipate

以对甲苯磺酸为催化剂催化合成己二酸二甲酯，研究了其反应规律.通过对不同实验条件下的多组实验数据进行动力学处理，建立了反应体系不分水条件下的酯化反应动力学模型.计算结果表明，在55-65℃条件下合成己二酸二甲酯的正、逆反应均服从二级动力学模型，正、逆反应的表观活化能和指前因子分别为6.2×10^4J·mol^-1、4.44×10^4J·mol^-1、1.382×10^8、1.003×10^5.催化剂的用量对正、逆反应的速率常数均有影响，呈线性关系.

Dimethyl adipate was synthesized using toluene-p-sulfonic acid as catalyst. The reaction mechanism was studied. The experimental data was analyzed on the basis of a dynamic method, and the kinetics model was established for the reaction system without water diversion. The calculating results show that for synthesis of dimethyl adipate at 55- 65 ℃, both positive and reverse reactions follow the second order of dynamic model, the apparent activation energy d positive and reverse reactions is 6.2 ×10^4J·mol^-1 and 4.44 ×10^4J·mol^-1, and the corresponding pre-exponential factor is 1.382 ×10^8 and 1.003×10^5. The rate constant of positive and reverse reactions waries with the content of catalyst, which exhibits a linear relationship.