三乙烯四胺对环己醇脱水生成环己烯的抑制作用

Inhibitory effect of triethylenetetramine on dehydration of cyclohexanol to cyclohexene

通过对添加三乙烯四胺(TETA)后的脱氢副产物组成进行研究,对环己烯、环己酮、苯、环己烷、轻组分、重组分与三乙烯四胺处理时间之间的关系进行分析。结果表明,三乙烯四胺处理时间达到40 h,加入量达到400 mL的情况下,环己烯的生成得到了有效的抑制,环己烯转化率从51. 5%降至1. 5%左右,环己酮的转化率则从49%提高到53%。环己烯在脱氢反应系统的歧化过程中对苯和环己烷存在一定的选择性,并且环己烯的含量对脱氢副产物中轻组分和重组分的含量均存在一定的影响。试验证明,TETA作为添加剂降低环己醇脱水反应,并且在工业上用于处理水合催化剂带入后系统的情况时是可行的。

This paper studies the relationship between the treatment time by triethylenetetramine（TETA） and the composition of dehydrogenation products including cyclohexene,cyclohexanone,benzene,cyclohexane,light and heavy components.It is found that the formation of cyclohexene is effectively inhibited,the conversion of cyclohexene drops from51. 53% to about 1. 5% and the conversion of cyclohexanone increases from 49% to 53%when the dehydration has been treated by 400 mL of TETA for 40 h. Cyclohexene has a certain selectivity for benzene and cyclohexane in the disproportionation process of the dehydrogenation reaction system,and cyclohexene content has a certain influence on the content of light and heavy components in the dehydrogenation by-products. Tests indicate that TETA as an additive can reduce the dehydration reaction of cyclohexanol,which is industrially feasible in dealing with situations where the hydration catalyst is carried into the dehydrogenation system.