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研究了HZSM-12沸石上甲苯、丙烯反应的产物分布及其影响因素。实验结果表明,在反应体系中同时存在烷基化反应、异构化反应以及歧化、裂解等副反应。催化剂的结构、酸中心特性以及反应条件对产物组成的分布都有明显的影响。在实验条件下产物分布为:对异丙基甲苯29.8～34.3%,间异丙烯甲苯58.0～65.4%,邻异丙基甲苯4.3～7.7%。该组成接近于反应温度下的热力学平衡组成。HZSM-12的失活是由于在强B 酸中心上生成积炭母体,并逐渐长大堵塞孔道所致。
The product distribution of toluene and propylene on HZSM-12 zeolite and its influencing factors were studied. The experimental results show that alkylation reaction, isomerization reaction and side reaction such as disproportionation and pyrolysis exist simultaneously in the reaction system. The structure of the catalyst, the characteristics of the acid center and the reaction conditions have a significant effect on the distribution of the product composition. Under the experimental conditions, the product distribution is 29.8-34.3% of p-cymene, 58.0-65.4% of m-isopropene and 4.3-7.7% of o-isopropylbenzene. The composition is close to the thermodynamic equilibrium composition at the reaction temperature. Inactivation of HZSM-12 is due to the formation of coke precursors on the site of strong B acid sites and the gradual growth of plugged pores.