【摘要】 以具有Brφnsted酸性的吡咯烷酮离子液体N-甲基-2-吡咯烷酮氟硼酸盐([Hnmp]BF4)为萃取剂和催化剂,含30%质量分数H2O2的双氧水为氧化剂,二苯并噻吩(DBT)的正辛烷溶液作为模型油,同时进行萃取脱硫和氧化脱硫,考察了n(H2O2)/n(S)、DBT初始浓度和反应温度对脱硫率的影响。结果表明,[Hnmp]BF4-H2O2体系产生的羟基自由基能将DBT氧化成相应的砜而进入离子液体相,从而脱除了模型油中的S;当n(H2O2)/n(S)=3、反应温度为60℃、模型油与离子液体等体积时,在60min内可以将油相中S质量浓度为1550μg/ml的DBT完全氧化脱除;DBT初始浓度越高,S的完全脱除就越困难。离子液体重复再生使用7次后,脱硫率明显降低。更多还原

【Abstract】 The solution of dibenzothiophene(DBT)dissolved in n-octane was used as the model of diesel fuels containing organosulfur compounds,and the 30%(mass fraction)aqueous solution of H2O2 was used as oxidant.DBT was removed from the model oil by a combination of both chemical oxidation and solvent extraction with the Brφnsted acidic ionic liquid(IL)of N-methyl-pyrrolidonium tetraflouoroborate([Hnmp]BF4)as extracting agent and catalyst.The effects of molar ratio of H2O2 to S(n(H2O2)/n(S)),initial concentration of DBT and reaction temperature on the rate of sulfur removal were investigated.The experimental results showed that the hydroxyl free radicals produced in [Hnmp]BF4-H2O2 system could oxidize DBT to form corresponding sulfone entering IL phase,then S was removed from model oil.In the operation,under the conditions of n(H2O2)/n(S)=3,reaction temperature 60℃,reaction time 1 h and V(Model oil)/V(IL)=1,1550 μg/ml of S in model oil was removed completely.The more the initial concentration of DBT,the more difficult the complete removal of S was.The ionic liquid [Hnmp]BF4 could be recycled 7 times without a significant decrease in the rate of sulfur removal.更多还原