摘要
以离子液体[Emim]S(硫酸乙酯-1-甲基-3-乙基咪唑)和[Epy]S(硫酸乙酯-N -甲基吡啶)作为萃取剂,将噻吩溶于正庚烷构成FCC汽油模拟体系。分别考察了单级萃取中剂油比、温度、粘度对脱硫率和分配比的影响。在多次萃取中,当萃取剂(离子液体)用量不变时,将其分成几等份进行多次萃取和一次性萃取相比较,可以显著提高脱硫率。结果表明,离子液体[Emim]S的脱硫效果比[Epy]S好。离子液体[Emim]S对噻吩的萃取动力学方程为:r_(表观)=0.18C_A-60.4,半衰期为6.3min,表明离子液体[Emim]S对该模拟体系的萃取为表观1-1级可逆萃取过程。模拟体系萃取脱硫适宜的条件为剂油比1:3,萃取温度30℃～40℃。在该条件下,对FCC汽油进行萃取脱硫,离子液体[Emim]S和[Epy]S可以有效地脱除汽油中的含硫化合物,其中对噻吩的萃取能力最强。
The extraction desulfurization capability of model light oil(thiophene dissolved in n-heptane )by ionic liquids 1-ethyl-3-methylimidazolium ethyl sulfate([Emim]S)and N-ethylpyridium ethyl sulfate([Epy]S)was investigated.The influence of ILs/oil ratio,temperature and viscosity on desulfuriza- tion and the distribution ratio was investigated respec- tively.The results showed that under 1:3 of the ILs/oil volume ratio,the distribution ratio of ionic liquids [Emim]S and [Epy]S has the maximum and[Emim] S better than [Epy]S.At the same time,the effect of desulfurization of light oil by divided the capacity of ILs into several average shares,is more effectively than the effect of once desulfurization.Finally,the extraction desulfurization dynamics was studied in a model system for[Emim]S/oil extraction system and with the equa- tion r_(apparent)=0.18C_A-60.4,the half-time is 6.3 min.From the kinetics'study,it can be shown that the reaction is 1-lorder opposite extraction process.The suitable conditions of a model system are as follows: ILs / oil ratio 1:3,and extraction temperature 30℃40℃.Finally,the effect of desulfurization of FCC gas- oline is investigated by different ILs / oil ratio.The re- suits indicate that ionic liquids[Emim]S and[Epy]S were effective for the selective removal of sulfur-con- taining compounds from gasoline at room temperature.
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2007年第5期377-381,共5页
Chemical engineering of oil & gas
基金
国家自然科学基金(No.20576026)资助项目。
关键词
离子液体
萃取脱硫
分配比
动力学
ionic liquids
extraction desulfurization
thiophene
distribution ratio
kinetics
