Dibenzothiophene removal using organic peroxide coupling ionic liquid
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摘要: 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6h,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6h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。Abstract: 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 \[bmim\]BF4 or \[bmim\]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 6h without catalyst and ionic liquids. As the system contains tungstophosphoric acid, organic peroxide and \[bmim\]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 6h when the molar ratio of catalyst to DBT, the volume ratio of oxidant to DBT and the volume ratio of \[bmim\]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.
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Key words:
- ionic liquids /
- desulfurization /
- oxidation /
- DBT /
- organic peroxide /
- coupling
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