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以酸性离子液体和Na2WO4.2H2O组成的体系为催化剂,过氧化氢为氧化剂,将催化柴油中的噻吩硫氧化为砜类物质,并通过NMP将其萃取出来,同时考察了反应温度、反应时间和催化剂用量等因素对氧化脱硫反应的影响,得出最佳反应条件为:3 mL油样(含硫200μg.g-1),1 g离子液体,0.021 g钨酸钠(Na2WO4.2H2O),0.7 mL过氧化氢,反应温度323 K,反应时间3 h,萃取剂与柴油体积比为1∶1,此时样品中的硫可降低到23μg.g-1。反应结束后,可以通过简单的倾倒将油样和催化剂分离,催化剂重复使用5次,催化活性基本不变。
The system composed of acidic ionic liquid and Na2WO4.2H2O was used as catalyst and hydrogen peroxide was used as oxidant to oxidize the thiophene sulfur in catalytic diesel to sulfone and extract it by NMP. The effects of reaction temperature, reaction time and The optimum reaction conditions were as follows: 3 mL oil sample (200μg.g-1 sulfur), 1g ionic liquid, 0.021g sodium tungstate (Na2WO4.2H2O), 0.7 mL hydrogen peroxide, the reaction temperature was 323 K, the reaction time was 3 h, the volume ratio of extractant to diesel was 1: 1, and the sulfur in the sample could be reduced to 23μg.g-1. After the reaction is completed, the oil sample and the catalyst can be separated by simple pouring, and the catalyst is reused for 5 times without any change in catalytic activity.