摘要
以不同的IL(ionicliquid)/油质量比,采用[BMIM][Cu2Cl3]([BMIM]=1butyl3methylimidazolium)对模型汽油和商品汽油进行单步和多步萃取脱硫实验;并合成几种具有不同阴离子和阳离子结构的离子液体,评价和比较了离子液体对商品汽油的萃取脱硫性能的影响。实验结果表明,具有较好的水稳定性和常温流动性的[BMIM][Cu2Cl3]离子液体硫容较高,在IL/油质量比为1∶3时,经多步萃取后,油品中的硫质量分数降至20×10-6～30×10-6,累计脱硫率超过95%。汽油中其他组分对脱硫效果影响很小。[BMIM][Cu2Cl3]与汽油形成稳定的两相系统,分离方便。离子液体脱硫能力可以通过四氯化碳反萃取完全恢复。
A moisture stable ionic liquid that contains Cu（ Ⅰ ） was used as solvent for desulfurization from gasoline in this paper. CuCl was mixed with 1-butyl-3-methylimidazolium （BMIM） chloride according to the molar ratio of 2：1 to synthesize [ BMIM] [ Cu2Cl3 ] ionic liquid. [ BMIM] [ Zn2Cl5 ] and [ Et3NH] [ Cu2Cl3 ] （Et = ethyl） were prepared in the same process. Model oil （dissolving thiophene in the mixture of heptane and toluene）and commercial gasoline were treated by [ BMIM] [ Cu2Cl3 ] at room temperature. It is found that [ BMIM][ Cu2Cl3 ] could remarkably remove sulfur from oil. After six-stage extraction, the S content in the model oil reduces from 650 × 10^-6 to 20 × 10^-6 when the mass ratio of IL/oil is 1 ： 3. The single stage desulfurization decreases from 37% to 23% with the IL/oil ratio decrease from 1：2 to 1：5. It is also shown that the desulfurization ability of [ BMIM] [ Cu2Cl3 ] from real gasoline is similar to that from model oil. Other components in gasoline have little influence on the desulfurization ability of [ BMIM] [ Cu2Cl3 ]. [ BMIM] [ Cu2Cl3 ] can be easily separated because of the biphasic systems of IL/oil formation. The polymerization products of olefin in gasoline are not detected in desulfurization. Desulfurization abilities of [ BMIM] [ Zn2Cl5 ] or [ Et3NH] [ Cu2Cl3 ] are lower than that of [ BMIM] [Cu2Cl3]. Carbon tetrachloride and toluene were used to regenerate the ionic liquid prepared. The regeneration was conducted at mass ratio IL/solvent of 1 ： 3 and temperature of 75℃ with stirring for 30 min. The regeneration results indicate that the sulfur removal capacity of IL is recovered completely by carbon tetrachloride treatment, but toluene shows poor ability to regenerate [ BMIM] [ Cu2Cl3 ]. CC14 might be easily seperated from the high boiling point thiophene derivatives absorbed by evaporation or rectification .
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2005年第4期431-434,共4页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(20490209)
教育部新世纪优秀人才支持计划~~
关键词
离子液体
脱硫
汽油
萃取
ionic liquids
desulfurization
gasoline
extraction
作者简介
张傑（1978-），男，天津人，博士研究生，化学工程与技术专业。E-mail：zhangjiea@eyou．com
黄崇品，Tel：010-64412054，E-mail：huangep@mail．buit．edu．cn
