离子液体中杂多酸季铵盐催化氧化汽油脱硫研究  

Oxidative desulfurization of gasoline catalyzed by heteropolyacid quaternary ammonium salt in the ionic liquid

作　　者：蔡庄红[1] 赵扬[1] 柴凤兰[1] 

机构地区：[1]河南化工职业学院,郑州450042

出　　处：《化工新型材料》2015年第2期151-153,共3页New Chemical Materials

基　　金：河南省高等院校自然科学研究计划项目(2011A150009)

摘　　要：将二苯并噻吩(DBT)溶于正辛烷配制成模拟汽油(硫含量500μg/g),以磷钼钒杂多酸季铵盐[(CH3)4N]4PMo11VO40为催化剂,离子液体[BMIM]PF6为萃取剂,H2O2为氧化剂,考察了催化剂用量、双氧水用量、反应温度、反应时间和硫化物种类对模拟汽油脱硫率的影响,并探讨了催化氧化脱硫机理。结果表明:当催化剂用量为0.02g/mL油、双氧水用量n(H2O2)/n(S)=4、反应温度60℃、反应时间60min和离子液体[BMIM]PF6体积为1mL时,催化氧化脱硫体系[(CH3)4N]4PMo11VO40/[BMIM]PF6/H2O2对含DBT的模拟汽油的脱硫率可达97.8%,该体系对不同硫化物脱硫率大小顺序为DBT>4,6-DMDBT>BT。在最佳工艺条件下,考察了该体系对FCC汽油的脱硫效果,脱硫后FCC汽油的硫含量为8.6μg/g,符合国Ⅴ汽油标准。该体系可循环使用,循环使用6次后,脱硫率没有明显降低。The model gasoline（S content 500ppm）was formulated into by the dibenzothiophene（DBT）dissolved in n-octane.The effects of catalyst dosage,oxidant dosage,reaction temperature,reaction time and sulfur species on the sulfur removal of model gasoline were studied.Under the catalyst of[（CH3）4N]4PMo11VO40,extraction solvent of[BMIM]PF6and oxidant of H2O2,the reaction mechanism of oxidation desulfurization was investigated.The results showed that when catalyst dosage 0.02g/mL gasoline,oxidant dosage n（H2O2）/n（S）=4,reaction temperature 60℃,reaction time 60 min and[BMIM]PF61mL,the sulfur removal of model gasoline could be 97.8%.The order of sulfur removal of different sulfur species was DBT〉4,6-DMDBT〉BT.Under the optimum conditions,the sulfur content of FCC gasoline could be decrease to 8.6μg/g after desulfurization,met the national standards of gasolineⅤ.The system could be recycled six times without obviously decrease in activity.

关 键 词：杂多酸季铵盐 离子液体 催化氧化脱硫 FCC汽油 

分 类 号：TE626.21[石油与天然气工程—油气加工工程]