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以餐饮废油和甲醇为原料,固体碱K2CO3/Al2O3为催化剂进行酯交换反应。考察了反应温度和反应时间对酯交换反应的影响。实验结果表明,酯交换反应速率随反应温度的升高而加快,最佳反应温度为65℃,反应时间为2 h,废油转化率最高可达95.7%。通过改变反应温度得到了酯交换反应动力学数据,即酯交换反应级数为1.94级,平均活化能为36.49 kJ/mol,指前因子为2.17×105 L/(mol·min),建立了酯交换反应动力学方程,并对动力学方程进行了验证。验证结果表明,废油转化率的计算值与实验值的相对误差均小于4%,说明所建立的反应速率方程在实验条件范围内能较好地描述该酯交换反应。该研究为固体碱催化餐饮废油与甲醇酯交换反应的动力学提供了理论基础。
Catering waste oil and methanol as raw materials, solid base K2CO3 / Al2O3 as a catalyst for transesterification. The effects of reaction temperature and reaction time on transesterification were investigated. The experimental results show that the transesterification rate increases with the increase of reaction temperature, the optimum reaction temperature is 65 ℃, the reaction time is 2 h and the conversion rate of waste oil is up to 95.7%. The kinetics of transesterification reaction was obtained by changing the reaction temperature, that is, the transesterification reaction order was 1.94, the average activation energy was 36.49 kJ / mol and the pre-exponential factor was 2.17 × 105 L / (mol · min) The reaction kinetic equation was exchanged, and the kinetic equation was verified. The verification results show that the relative errors between calculated and experimental values of the conversion of waste oil are less than 4%, indicating that the established reaction rate equation can better describe the transesterification reaction within the experimental conditions. This study provides a theoretical basis for the kinetics of solid base catalyzed transesterification of restaurant waste oil and methanol.