醋酸甲酯水解的反应动力学

针对醋酸甲酯水解悬浮催化蒸馏工艺的要求,对杂多酸铵盐用作醋酸甲酯水解反应催化剂的反应动力学做了研究。研究表明，磷钨酸铵催化醋酸甲酯水解反应为二级可逆反应，采用拟均相模型回归了该水解反应的动力学方程，求得其活化能为E₊=52.02 kJ·mol^-1,E_-=44.7 kJ·mol^-1。使用磷钨酸铵在100 ℃下醋酸甲酯水解正反应速率常数k₊=12.84 L²·（mol·min·g）^-1，明显高于现有工业催化剂强酸性阳离子交换树脂在其最高使用温度下的速率常数值6.453 L²·（mol·min·g）^-1，有望开发成为悬浮催化蒸馏醋酸甲酯水解催化剂良好前景，为以后的工业试验提供了依据。

The kinetics for hydrolysis of methyl acetate over ammonium heteropoly acids

The kinetics for heterogeneous hydrolysis of methyl acetate over ammonium heteropoly acids was studied. The results showed that the methyl acetate hydrolysis reaction is a secondary reversible reaction. The complete kinetic equation is follows: －r=－dc_MeAc/dt=kc_MeAcc_{H2 O}－c_MeOHc_HAc/K where ]=exp(0.81461－873.6232/T);k=221.4exp(－6260/T). The activation energy E₊=52.02 kJ·mol^－1;E_-=44.7 kJ·mol-¹. The reaction rate constant k₊=12.84 L²·(mol·min·g)^－1，higher than that of resin catalyst ［6.453 L²·(mol·min·g)^－1］.The ammonium heteropoly acids is promising as a new catalyst for hydrolysis of methyl acetate in suspension catalytic distillation system,in stead of resin catalyst in fixed bed reactor.