甲醇甲苯烷基化制对二甲苯工艺优化及模拟

Optimization and simulation for the process of toluene alkylation with methanol to produce para-xylene

采用华谊集团技术研究院研制的20~30目改性ZSM-5分子筛催化剂,考察了在甲苯甲醇摩尔比2,反应温度(480~560)℃,甲苯甲醇总质量空速(1~4)h^(-1)的条件下的反应规律。在排除内外扩散的条件下,采用固定床积分反应器开展了甲苯甲醇择型烷基化反应的动力学研究。选取幂函数形式建立动力学方程,采用非线性回归方法估测动力学模型参数。主反应对甲苯和甲醇的反应级数分别为2.5、2.5时模拟值与实验值吻合较好,得到甲苯甲醇烷基化的表观活化能为38.586 k J/mol。残差分析和统计检验表明所建动力学模型是适用的。

The reaction performance of toluene alkylafion with methanol on self-prepared zeolite catalyst with 20 to 30-mesh was studied at the temperature of （480-560）℃, WHSV of toluene and methanol of （1-4） h-1. In the condition of excluding external diffusion, kinetics study was carried on the fixed bed reactor. Kinetics of the power function model was used to estimate the kinetic model parameter with the nonlinear least squares method. The apparent activation energy for the alkylation of toluene with methanol was 38.586 kJ/mol, and the reaction orders for toluene and methanol reaction were 2.5 and 2.5. The residual analysis and statistical tests show that the proposed kinetic model is reliable and adequate.