| 韩传红,李杰飞,刘杰,魏西莲.化学通报,2015,78(11):1028-1032. |
| 1-丁基-3-甲基咪唑四氟硼酸盐/十二烷基苯磺酸钠/水形成双水相体系的热力学研究 |
| Thermodynamic Study of the Aqueous Two-Phase Systems of 1-Butyl-3-Methylimidazolium Tetrafluoroborate and Sodium Dodecylbenzenesulfonate |
| 投稿时间：2015-04-08 修订日期：2015-05-03 |
| DOI： |
| 中文关键词: 三元相图 双水相 十二烷基苯磺酸钠 等温滴定微量热 |
| 英文关键词:Ternary phase diagram, Aqueous two-phase system, SDBS, Isothermal Titration Microcalorimetry |
| 基金项目:国家自然科学基金(21473084,21073081)和山东省自然科学基金(ZR2012BQ013) |
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| 中文摘要: |
| 在298.15 K下使用目测法和浊度法绘制了1-丁基-3-甲基咪唑四氟硼酸盐([Bmim]BF4)＋十二烷基苯磺酸钠(SDBS)＋水体系的三元相图,得到了狭窄的靠近离子液体和水一侧的双水相(ATPS)区域。从三元相图的双水相区域周围选择不同组成的样品,用等温滴定微量热(ITC)测定了样品中逐滴加入三次水后体系热量的变化,发现随样品中水含量的增加,量热曲线会出现一个不太明显的吸热和放热过程,且与三元相图中双水相的形成和消失的位置完全吻合,这说明ITC对于双水相体系的热力学研究是一种可行且有效的方法。对本文体系双水相的研究结果表明,双水相的形成是吸热过程(ΔH > 0),而消失是放热过程(ΔH < 0),由于双水相的形成是等温等压下的热力学自发过程(ΔG < 0),因此可以判断该体系双水相的形成是一个熵驱动过程,而消失是一个熵焓共驱过程。 |
| 英文摘要: |
| We got a narrow aqueous two-phase system (ATPS) region near the side of water-ionic liquid by drawing the ternary phase diagram of the system of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4)＋sodium dodecylbenzenesulfonate (SDBS)＋water using ocular estimate and turbidity method at 298.15 K. A series of samples with different compositions around the ternary diagram were chosen. We studied the enthalpy change of these systems after injecting triply distilled water into samples using ITC. It is found that with the increase of water content, there is an obscure endothermic and exothermic process which matches perfectly with the location of the formation and disappearance of the aqueous two-phase in the ternary phase diagram. This shows that the ITC is a feasible and effective method for the thermodynamic study of aqueous two-phase systems. The result for this aqueous two-phase system indicates that the formation of the aqueous two-phase system is endothermic(ΔH > 0), but the process of disappearing is exothermic(ΔH < 0). Due to the aqueous two-phase formation is a thermodynamic spontaneous process under the isothermal constant pressure, we can judge that the formation of this aqueous two-phase system is a entropy driven course and that the vanish is a total driven process by entropy and enthalpy. |
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