引发剂对离子液体催化正己烷异构化反应的影响

Influence of initiators on isomerization of normal hexane catalyzed by ionic liquids

由无水三氯化铝与盐酸三乙胺按照摩尔比2∶1合成了离子液体2AlCl3/Et3NHCl,并考察了其催化正己烷异构化的反应性能。发现离子液体2AlCl3/Et3NHCl可用于催化正己烷的异构化反应,但所需的反应时间较长。考察了引发剂正丁醇、异丁烯、异丁烷和异戊烷对离子液体催化正己烷异构化反应的影响。发现异戊烷作为引发剂时,正己烷的转化率为84.54%,液体收率为80.08%,异构烷烃的选择性为94.74%,达到了较好的反应效果。引发剂异戊烷的用量对异构化反应有着较大的影响,较优的引发剂用量为30%。添加异戊烷引发剂能明显提高离子液体催化正己烷异构化的反应速度,达到相似反应程度的反应时间可由6 h缩短为45 min。

An ionic liquid was synthesized with anhydrous aluminum chloride and amine hydrochloride with the mole ratio of 2： 1. The isomerization of n-hexane catalyzed by the ionic liquid was investigated. The results indicate that the ionic liquid can catalyze the isomerization of n-hexane, but it requires long reaction time. The influence of initiators including n-butanol, i-butene,i-butane and i-pentane on the isomerization of n-hexane was investigated. The conversion of n-hexane, the yield of liquid components and the selectivity of isoparaffins are 84.54%, 80.08% and 94.74%, respectively, when i-pentane is used as the initiator. This shows that i-pentane is a good initiator for the isomerization of n-hexane. The dosage of i-pentane shows great influence on the isomerization of n-hexane, and the suitable dosage is 30%. The initiator i-pentane can greatly accelerate the rate of the isomerization.of n-hexane. The reaction time can be shortened from 6 h to 45 min to achieve the similar reaction extent.