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本研究采用玻璃结构的磁驱动内循环无梯度反应器,考察了反应温度为340℃～420℃,苯/乙烯为5～1的分子比范围内,AF—5分子筛催化剂在乙烯对苯的气相烷基化反应中的结焦规律。在试验范围内,得到了结焦速率式,结焦量与反应时间,结焦量与催化剂活性的关联式。研究结果表明,结焦反应可用平行连串反应历程来表示:苯→乙苯→二乙苯焦母体焦测定了反应温度、反应时间、乙烯分压,空速和催化剂颗粒度等参数对结焦的影响。本研究还推测了 AF—5分子筛催化剂的失活机理;0t_b,单分子焦层的活性位覆盖和多分子焦层引起孔道狭窄的联合效应。
In this study, a glass-structured magnetically driven internal circulation gradientless reactor was used to investigate the effect of AF-5 molecular sieve catalyst in the gas phase of ethylene-benzene on the molar ratio of benzene to ethylene of 340 ℃ ~ 420 ℃. Coking law in alkylation reaction. In the experimental range, the correlation formula of coking rate, coking amount and reaction time, coking amount and catalyst activity were obtained. The results show that the coke reaction can be expressed in parallel series of reactions: benzene → ethylbenzene → diethylbenzene coke body coke determination of the reaction temperature, reaction time, ethylene partial pressure, space velocity and catalyst particle size and other parameters on coking impact . This study also speculated that the deactivation mechanism of AF-5 zeolite catalyst; 0 t_b, active site coverage of single molecular coke layer and multi-molecular coke layer The narrow joint effect of the tunnel.