苯与乙烯高空速烷基化反应工艺条件优化及原因探讨

Optimum and Discussion on the Reaction of Alkylation of Benzene with Ethylene under the Condition of High Space Velocity

关键词:  苯  乙烯  高空速  烷基化  β分子筛

Key words:  benzene,ethylene  space speed  alkylation  beta zeolite

摘要:

针对苯与乙烯烷基化反应中催化剂的处理量小的特点,通过实验研究确定了β分子筛催化剂在苯与乙烯烷基化反应中的高空速反应条件:即经过低空速反应一段时间再调为高空速条件下反应;并在此基础上对其原因进行了探讨,发现低空速反应一段时间后可以有效抑制催化剂孔道内的积炭速度和酸中心的钝化速度。

Abstract:

The experiments for the alkylation of benzene with ethylene was performed in lab in order to decide a proper reaction conditions,the results showed that the reaction is firstly operated at a low space velocity for some hours and then shift to high space velocity,the activity stability of the beta zeolite catalyst will be improved remarkably. The analysis of physical chemistry characterization showed that the velocity of the carbon deposit in the pore was restrained and the passivation of acid sites was slowed down when the beta zeolite catalyst is first exposed to the lower air speed for some time.