高校化学工程学报Issue(6)：1297-1305,9.DOI:10.3969/j.issn.1003-9015.2015.06.003
毛细管气相色谱法测定[bmmim][NTf2]中的无限稀释活度系数
Measurements of Infinite Dilution Activity Coefficients of Ionic Liquid [bmmim][NTf2] Using Gas Chromatography with Static-Wall-Coated Open-Tubular Columns
摘要
Abstract
This paper was mainly to investigate the distribution behaviors of 60 organic compounds in 1-butyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide, [bmmim][NTf2] at the temperature of 313.15, 323.15 and 333.15 K. The static-wall-coated open-tubular (WCOT) columns with three different wall thicknesses were used to measure the retention time by gas chromatograph and the data of infinite dilution activity coefficients (γ∞) were calculated by the revised equation. In addition, selectivity coefficients and capacity factors were calculated from the determinedγ∞ values. The linear solvation energy relationship (LSER) model regression constants of [bmmim][NTf2] were obtained by linear fitting. The results show that the dominant interactions are hydrogen-bond asicity and dipolarity/polarizability,and the hydrogen-bond basicity of [NTf2]- is weaker than [dca]-and similar to [PF6]-. Meanwhile, hydrogen-bond acidity would decrease whena-H of imidazolyl is substituted by methyl. At last, the feasibility of [bmmim][NTf2] used as extractants for mixtures which are hard to separate such as acetonitrile-ethanol, acetone-cyclohexane, benzene-cyclohexane and toluene-methyl cyclohexane mixtures was investigated.关键词
无限稀释活度系数/离子液体/毛细管柱/线性溶剂化能模型/气相色谱法Key words
infinite dilution activity coefficients/ionic liquid/static-wall-coated open-tubular columns/linear solvation energy relationship model/gas chromatography分类
化学化工引用本文复制引用
相晓晴,苏宝根,钱思恒,徐倩倩,鲍宗必,邢华斌,杨启炜,任其龙..毛细管气相色谱法测定[bmmim][NTf2]中的无限稀释活度系数[J].高校化学工程学报,2015,(6):1297-1305,9.基金项目
国家自然科学基金(21436010，21222601，91434115)；浙江省自然科学基金(LR13B060001)；教育部新世纪优秀人才支持计划(NCET-13-0524)资助。 （21436010，21222601，91434115）
