离子液体水溶液中紫丁香醇溶解的微量热
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摘要
考察了298.15～313.15 K 1-丁基-3-甲基咪唑氯盐([C_4C_1im]Cl)水溶液中紫丁香醇溶解特性。温度升高,紫丁香醇溶解度增大;随着[C_4C_1im]Cl摩尔分数增大,紫丁香醇溶解度先增大而后减小,[C_4C_1im]Cl摩尔分数为0.134时溶解度最高(3.58 kg/kg,313.15 K)。利用等温微量热仪测量298.15 K [C_4C_1im]Cl水溶液中紫丁香醇溶解热,计算出标准溶解焓和转化焓。结果表明,随着[C_4C_1im]Cl摩尔分数增大,溶解焓减小,转化焓增大。溶解焓和转化焓在[C_4C_1im]Cl摩尔分数为0.134时存在明显转折点,此时溶解热动力学速率常数最大。
The solubility of syringol in 1-butyl-3-methylimidazolium chloride([C_4C_1im]Cl) aqueous solutions was investigated at 298.15-313.15 K. Solubility of syringol was enhanced with the increase of temperature. Solubility of syringol firstly increased and then decreased with the increase of the [C_4C_1im]Cl mole fraction, and the maximum solubility of 3.58 kg/kg was obtained at [C_4C_1im]Cl mole fraction of 0.134(313.15 K). The heat of dissolution for syringol was measured using an isothermal microcalorimeter at 298.15 K. The standard enthalpies of dissolution and the transfer from water to the mixed solvent were calculated. The enthalpies of dissolution decreased with the increase of [C_4C_1im]Cl mole fraction, while the enthalpies of transfer increased. A distinct break point of the enthalpies of dissolution and the transfer, and the maximum dissolution rate constant was observed at [C_4C_1im]Cl mole fraction of 0.134.
The solubility of syringol in 1-butyl-3-methylimidazolium chloride([C_4C_1im]Cl) aqueous solutions was investigated at 298.15-313.15 K. Solubility of syringol was enhanced with the increase of temperature. Solubility of syringol firstly increased and then decreased with the increase of the [C_4C_1im]Cl mole fraction, and the maximum solubility of 3.58 kg/kg was obtained at [C_4C_1im]Cl mole fraction of 0.134(313.15 K). The heat of dissolution for syringol was measured using an isothermal microcalorimeter at 298.15 K. The standard enthalpies of dissolution and the transfer from water to the mixed solvent were calculated. The enthalpies of dissolution decreased with the increase of [C_4C_1im]Cl mole fraction, while the enthalpies of transfer increased. A distinct break point of the enthalpies of dissolution and the transfer, and the maximum dissolution rate constant was observed at [C_4C_1im]Cl mole fraction of 0.134.
引文
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[5] FAN J,FAN Y C,PEI Y C,et al.Solvent extraction of selected endocrine-disrupting phenols using ionic liquids[J].Separation and Purification Technology,2008,61(3):324-331.
[6] HOU Y C,REN Y H,PENG W,et al.Separation of phenols from oil using imidazolium-based ionic liquids[J].Industrial Engineering Chemistry Research,2013,52(50):18071-18075.
[7] CLAUDIO A F M,NEVES M C,SHIMIZU K,et al.The magic of aqueous solutions of ionic liquids:ionic liquids as a powerful class of catanionic hydrotropes[J].Green Chemistry,2015,17(7):3948-3963.
[8] 王琳琳,魏立纲,王艳涛,等.离子液体-水体系下微波辅助脱木质素研究[J].大连工业大学学报,2015,34(6):441-444.
[9] 赵德阳,魏立纲,李坤兰,等.2,6-二甲氧基苯酚在1-丁基-3-甲基咪唑四氟硼酸盐水溶液中溶解行为的红外光谱分析[J].化工学报,2015,66(S1):54-59.
[10] 张晓红,许红岩,葛玲玲,等.表面活性离子液体溴化N-十二烷基异喹啉与非离子表面活性剂TritonX-100在水溶液中的混合胶束[J].物理化学学报,2016,32(1):356-364.
[11] 丁珊,魏立纲,王艳涛,等.有机溶质在双烷烃咪唑醋酸盐离子液体中无限稀释活度系数的测定[J].大连工业大学学报,2016,35(1):29-32.
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[13] WANG L Y,LI X C,ZHU L,et al.Experimental determination and correlation of the solubility of 4-hydroxy-2,5-dimethyl-3(2H)-furanone (DMHF) in binary (ethanol+water) solvent mixtures[J].Journal of Molecular Liquids,2015,208:211-218.
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[15] ZHANG L Q,XU Z,WANG Y,et al.Prediction of the solvation and structural properties of ionic liquids in water by two-dimensional correlation spectroscopy[J].Journal of Physical Chemistry B,2008,112(20):6411-6419.