甲苯液相氧化动力学研究

Kinetics of liquid-phase oxidation of toluene

建立了一套甲苯液相空气氧化的连续反应装置,在工业条件下进行了动力学实验研究。在排除氧气、催化剂质量分数等影响因素下,建立了反应动力学模型,并回归得到模型参数。用该模型计算得到的甲苯转化率和实验结果对比,最大误差4.72%,平均误差2.36%。研究结果表明,甲苯转化率受温度和停留时间的影响较大,尤以温度影响更为明显;主产物选择性受温度和停留时间的影响较小,但停留时间延长,会加剧苯甲醛向苯甲酸转化。

A continuous experiment apparatus was set up for kinetic research ol liquid-phase oxidation of toluene Dy air under industrial condition. By eliminating the effects such as oxygen and catalyst mass fraction, a kinetic model was developed, and the parameters were estimated. Based on the equation, the maximum and mean deviations of conversion between the experimental data and calculated values were 4.72% and 2.36% , respectively. The results show that the conversion of toluene is effected by the temperature and residence time, especially by the former. The selectivity of main products is less influenced by the temperature and residence time, but when the time is prolonged, it will aggressively increase the conversion of benzyldehyde to benzoic acid.