Removal of trace olefins from aromatics by using ionic liquid
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摘要: 以室温离子液体为催化剂，对芳烃中的微量烯烃杂质进行深度脱除。考察了离子液体种类、用量、温度等不同因素对烯烃脱除效果的影响。结果表明，[bmim]Br-AlCl3离子液体显示了优良的催化性能，在离子液体的质量分数为5%、室温、反应10min下，溴指数从原料的773.5下降到10以下，芳烃中微量烯烃脱除率达到99%以上，离子液体可重复使用，并对反应机理进行了研究。Abstract: Room-temperature ionic liquids were used as catalysts for removal of trace olefins from the aromatics. The influences of various reaction parameters such as reaction time, dosage and type of catalyst were investigated. The experimental results demonstrated that the [bmim]Br-AlCl3 ionic liquid exhibited excellent activity under mild reaction conditions, with above 99% conversion of olefins and the bromine index of the aromatics varied from 773.5 to below 10. Furthermore, the ionic liquids could be reused easily. A possible reaction mechanism was proposed.
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Key words:
- ionic liquid /
- bromine index /
- olefins removal /
- aromatics
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