离子液体耦合有机过氧化物脱除二苯并噻吩的研究

Dibenzothiophene removal using organic peroxide coupling ionic liquid

以12-磷钨酸为催化剂,研究了离子液体耦合有机过氧化物脱除二苯并噻吩（DBT）。研究结果表明,单独使用离子[bmim]BF4、[bmim]PF6液体为萃取剂,脱硫率为27.78%~38.76%。以由等体积的H2O2与甲酸制成有机过氧化物为氧化剂,不使用催化剂和离子液体,温度70℃,反应时间6 h,DBT氧化为二苯并噻吩砜的比例为76.6%。在催化剂作用下,将离子液体与氧化剂耦合使用时,脱硫率明显提高。当催化剂与DBT的摩尔比为0.20∶1,氧化剂与DBT的体积比为10∶1,[bmim]PF6离子液体与DBT的体积比为1∶1,在70℃反应6 h后,脱硫率可达98.60%。耦合体系重复使用五次后,氧化脱硫活性没有明显降低。

Taking tungstophosphoric acid as the catalyst,the removal of dibenzothiophene（DBT） remained in n-heptane using organic peroxide coupling ionic liquid was studied.The results indicate that the removal of sulfur is only about 27.78%~38.76% by using BF4 or PF6 ionic liquid（IL） as an extractant alone for the DBT-containing model oil.While 76.6% of DBT can be oxidized to dibenzothiophene sulfone by using the organic peroxide made from organic formic acid and H2O2 in equal volume as oxidants at 70 ℃ and the reaction time of 6 h without catalyst and ionic liquids.As the system contains tungstophosphoric acid,organic peroxide and PF6 ionic liquid,the catalytic oxidation and sulfur removal are improved apparently.The DBT removal reaches 98.60% at 70 ℃ and the reaction time of 6 h when the molar ratio of catalyst to DBT,the volume ratio of oxidant to DBT and the volume ratio of PF6 ionic liquid to DBT are 0.20∶1,10∶1,1∶1,respectively.The coupling system could be recycled five times without significant decrease in activity.