苯与长链烯烃在磷铝系催化剂上的烷基化反应动力学研究

首次采用磷铝固体酸催化剂替代氢氟酸对苯与长链烯烃的烷基化反应过程进行了研究。反应过程在自制的固定床反应器中进行,且消除了内外扩散的影响。在反应温度533 K、压力4.8 MPa、空速1 h~(-1)和苯/烯摩尔比8:1的条件下测定了本征动力学数据,实际动力学方程计算线形回归约为r=kC_A,频率因子k_0=7.509×10~4,反应活化能△E=198.0 kJ/mol。依据L-H和R-E机理推导出的模型方程约为r=k'C_A,频率因子k'_0=9.268×10~4,活化能△E=191.5 kJ/mol。因此,可近似认为表面反应是反应的速率控制步骤。

Study on Alkylation Kinetics of Benzene with Long-chain Alkene on P-Al Solid Acid Catalyst

The alkylation of benzene with long - chain alkene was investigated using P - Al solid acid instead of HF acid as catalyst for the first time. The reaction carried out in a fixed - bed reactor under the conditions with internal and external diffusion resistance eliminated. The intrinsic kinetics data were obtained from experiment under the reaction conditions: temperature 533 K, pressure 4.8 MPa, space rate 1 h , and molar ratio of benzene/alkene 8 = 1. Practical kinetic model of thereaction, r = kCA, was found by computing the data. At the same time, theoretical model, r = k' CA, was derived from L - H and R - E theory. The two models showed that surface reaction was the reaction rate controlling step.