反气相色谱法表征离子液体1-乙基-3-甲基咪唑六氟磷酸盐的溶解度参数（英文）

Determination of the solubility parameter of ionic liquid 1-ethyl-3-methylimidazolium hexafluorophosphate by inverse gas chromatography

采用反气相色谱法(IGC)表征了离子液体1-乙基-3-甲基咪唑六氟磷酸盐([EMIM]PF_6)在343.15-373.15 K温度范围内的溶解度参数。各温度下溶解度参数分别为20.76(J/cm^3)^(0.5)(343.15 K),20.21(J/cm^3)^(0.5)(353.15 K),19.73(J/cm^3)^(0.5)(363.15 K),19.24(J/cm^3)^(0.5)(373.15 K)。然后,通过外推法得到[EMIM]PF_6在室温(298.15 K)时的溶解度参数为23.01(J/cm^3)^(0.5)。同时,测定了探针溶剂与[EMIM]PF_6之间的质量分数活度系数、无限稀释活度系数和Flory-Huggins相互作用参数等热力学参数。结果表明,n-C_6,n-C_7,n-C_8,n-C_9和四氢呋喃为[EMIM]PF_6的不良溶剂;而苯、甲苯、乙醇、甲醇、二氯甲烷、丙酮、乙酸乙酯、氯仿、乙醚、四氯化碳、乙酸甲酯和环己烷为[EMIM]PF_6的良溶剂。

The solubility parameters of the ionic liquid（ IL） 1-ethyl-3-methylimidazolium hexafluorophosphate,[EMIM]PF_6,were determined by inverse gas chromatography（ IGC） at temperatures from 343. 15 to 373. 15 K. The solubility parameters of[EMIM]PF_6were calculated to be 20. 76（ J/cm^3）^0.5（ 343. 15 K）,20. 21（ J/cm^3）^0.5（ 353. 15 K）,19. 73（ J/cm^3）^0.5（ 363. 15 K） and 19. 24（ J/cm^3）^0.5（ 373. 15 K）,then the solubility parameter at room temperature（ 298. 15 K） was obtained to be 23. 01（ J/cm^3）^0.5by linear extrapolation method.The thermodynamic parameters including weight fraction activity coefficient,activity coefficients at infinite dilution and Flory-Huggins interaction parameters between[EMIM]PF_6and the solvents were also determined. The results showed that the solvents including n-C_6,n-C_7,n-C_8,n-C_9,and tetrahydrofuran were the poor solvents for[EMIM]PF_6,while benzene,toluene,ethanol,carbinol,dichloromethane,acetone,ethyl acetate,chloroform,ether,tetrachloromethane,methyl acetate and cyclohexane were the favorite ones.