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针对Amberlyst-15树脂为催化剂的草酸二乙酯水解过程进行了研究,考察了催化剂用量、水酯比及温度对反应的影响。结果表明Amberlyst-15的加入能明显提高水解速率。草酸二乙酯水解反应为连串反应,草酸单乙酯为中间产物。基于树脂催化反应特点提出了包含离子交换树脂催化作用和水解产生的草酸的催化作用在内的动力学模型。通过实验数据的回归获得动力学参数,模型计算与实验数据的平均相对偏差<0.06,表明该模型适用于草酸二乙酯树脂催化水解动力学规律的描述。
The hydrolysis of diethyl oxalate catalyzed by Amberlyst-15 resin was investigated. The effects of catalyst amount, water-ester ratio and temperature on the reaction were investigated. The results show that the addition of Amberlyst-15 can significantly improve the hydrolysis rate. The hydrolysis of diethyl oxalate is a series of reactions with monoethyl oxalate as the intermediate. Based on the characteristics of the catalytic reaction of the resin, a kinetic model including the catalytic action of the ion exchange resin and the catalytic action of oxalic acid produced by the hydrolysis was proposed. The kinetic parameters were obtained by the regression of experimental data. The average relative deviation between model calculation and experimental data was less than 0.06, indicating that this model is suitable for the description of the kinetics of catalytic hydrolysis of diethyl oxalate resin.