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。
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 H2 O2 was used as oxidant. DBT was removed from the model oil by a combination of both chemical oxidation and solvent extraction with the Bronsted 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-H202 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, 1550μg/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.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2008年第2期227-231,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(20576026)资助
关键词
离子液体(IL)
过氧化氢
萃取
二苯并噻吩
氧化脱硫
ionic liquid （IL）
hydrogen peroxide
extraction
dibenzothiophene
oxidativedesulfurization
