甲缩醛与三聚甲醛合成聚甲氧基二甲醚反应速率研究

摘要

In order to explore the effect of reaction conditions to the synthesis of polyoxymethylene dimethyl ethers (PODE) from methylal and trioxymethylene, the reaction performance and rate were investigated in a stainless steel tube fixed-bed reactor, using the strong acid cation exchange resin modified by p-toluenesulfonic acid as the catalyst. The results indicated that the conversion of trioxymethylene was over 90%with this composite catalyst. The reaction kinetics of power function type was established according to the mechanism of consecutive reactions and the kinetic parameters were estimated by Particle Swarm Optimization. The model results calculated with four orders Runge Kutta method can describe well the reaction conversion and the product distribution obtained experimentally, which shows that the kinetic model is feasible. This work can provide the fundamental data for the reactor simulation and scale-up.%为了探究反应条件对聚甲氧基二甲醚合成的影响，采用对甲基苯磺酸改性的强酸性阳离子交换树脂为催化剂，在固定床反应器中考察了甲缩醛和三聚甲醛合成聚甲氧基二甲醚的催化活性并研究了反应速率方程。结果表明，该催化剂具有较好的催化活性，三聚甲醛的转化率达到95%以上。根据连串反应机理，建立了幂函数反应速率方程，采用四阶龙格库塔方法对反应速率方程进行计算，使用粒子群算法（Particle Swarm Optimization）对反应速率方程参数进行了拟合回归。结果表明，该反应速率方程能较好地反映甲缩醛和三聚甲醛的转化率以及产物分布，为反应器模拟以及放大生产提供了基础数据。