A lumped kinetic model has been developed for the methanol to olefins (MTO) reaction over phosphorus modified HZSM-5 catalyst. In consideration of mixed feed cracking, a higher reaction temperature than the conventional MTO reaction was chosen. The reaction temperature considered is in range of 500 to 680 °C. The experimental data for the kinetic model were obtained in an isothermal fixed bed reactor over a wide range of operating temperatures and space time of 0.160 to 0.801 g-cat·h/mole of methanol feed. A reaction mechanism comprising seven lumps was utilized to analyze the kinetic behavior of this catalyst. Based on the mathematical kinetic model for the fixed bed reactor, the kinetic parameters were determined by numerical optimization using a hybrid of genetic algorithm and active set gradient method. The developed kinetic model reasonably predicts the experimental data obtained for the reaction conditions considered. It has been found that increasing space time is favorable to light olefins yield, while a maximum water free basis olefin yield of about 82 weight % was obtained at a temperature of 630 °C for a space time of 0.801 g-cat·h/mole of methanol feed.

已经开发了一种集中动力学模型，用于在磷改性 HZSM-5 催化剂上的甲醇制烯烃 (MTO) 反应。考虑到混合原料裂解，选择了比常规 MTO 反应更高的反应温度。所考虑的反应温度在 500 至 680 °C 的范围内。动力学模型的实验数据是在等温固定床反应器中在 0.160 至 0.801 g-cat·h/mol 甲醇进料的宽操作温度和时空范围内获得的。利用包含七个团块的反应机理来分析该催化剂的动力学行为。基于固定床反应器的数学动力学模型，采用遗传算法和活性集梯度法的混合方法通过数值优化确定动力学参数。开发的动力学模型合理地预测了针对所考虑的反应条件获得的实验数据。已经发现，增加时空有利于轻质烯烃的产率，而在 630 °C 的温度和 0.801 g-cat·h/mol 的时空时间下获得的最大无水基础烯烃产率约为 82 重量％甲醇进料。