苯选择加氢制环己烯工艺条件的优化  

Optimization of the process conditions for selective hydrogenation of benzene to cyclohexene

作　　者：张乃文 Zhang Naiwen(Tangshan Zhonghao Chemical Corporation Ltd.,Tangshan 063611,China)

机构地区：[1]唐山中浩化工有限公司,河北唐山063611

出　　处：《煤炭与化工》2020年第11期121-123,126,共4页Coal and Chemical Industry

摘　　要：针对在串联双釜连续加氢反应器中进行的苯选择加氢制环己烯反应实际生产中苯的转化率和环己烯的选择性的数值低于设计值的情况,考察了母液中Zn^2+浓度、催化剂中Zn^2+浓度和搅拌器转速对Ru-Zn催化剂苯加氢制环己烯性能的影响。结果表明,增加母液中Zn^2+的浓度,能在一定程度上提高环己烯的选择性;增加催化剂中Zn^2+的浓度,能提高环己烯的选择性,但苯的转化率随之下降。当搅拌器转速在120 r/min时,环己烯收率达到最大。通过对比负载型Ru-Zn催化剂和非负载型Ru-Zn催化剂性能,非负载型Ru-Zn催化剂具有更高的环己烯收率。苯选择加氢制环己烯的最佳条件为母液中Zn^2+浓度为5%,催化剂中Zn^2+浓度为2.0%,搅拌器转速为120 r/min。In view of the selective hydrogenation of benzene to cyclohexene in a series two-tank continuous hydrogenation reactor,the conversion rate of benzene and the selectivity values of cyclohexene in actual production are lower than the design value,the effects of Zn^2+concentration in mother liquor,Zn^2+concentration in catalyst and stirrer speed on the performance of Ru-Zn catalyst for benzene hydrogenation to cyclohexene were investigated.The results show that the selectivity of cyclohexene can be improved by increasing the concentration of Zn^2+in mother liquor to a certain extent;the selectivity of cyclohexene can be improved by increasing the concentration of Zn^2+in the catalyst,but the conversion rate of benzene decreased accordingly,and the yield of cyclohexene reaches the maximum when the speed of the stirrer is 120 r/min.By comparing the performances of the supported Ru-Zn catalyst and the unsupported Ru-Zn catalyst,the unsupported Ru-Zn catalyst has a higher yield of cyclohexene.The optimal conditions for selective hydrogenation of benzene to cyclohexene are the concentration of Zn^2+in mother liquor is 5%,the concentration of Zn^2+in catalyst is 2.0%,and the stirrer speed is 120 r/min.

关 键 词：苯 加氢 钌 锌 催化剂 

分 类 号：TQ231.14[化学工程—有机化工]