Abstract With the increasing research on the aqueous two-phase systems (ATPS), the ATPS containing ionic liquid (IL) and salt have been widely used in the extraction and purification process. In this work, the partitioning of 2-chlorophenol in novel ATPS composed of n-butylpyridinium trifluoromethanesulfonate and salts (ammonium sulfate, sodium dihydrogen phosphate) is evaluated. Firstly, the cloud point titration method was used to determine the binodal curves data experimentally at four temperatures and atmospheric pressure. And Merchuk equation was used to fit the binodal curves. Then, the gravimetric method was used to initially determine the tie-lines data and the concentration of all the ions in the top and bottom phases were determined by ion chromatography method to study the ion exchange in the ATPS. The reliability of tie-lines was evaluated by Othmer-Tobias and Bancroft equations. Finally, the influence of types of salts and temperature on the phase diagrams were studied carefully. Besides, in order to analyze the application of ATPS in the extraction, the partition coefficient of 2-chlorophenol was calculated at the same total composition while at different temperature. The ATPS formed by n-butylpyridinium trifluoromethanesulfonate, ammonium sulfate, and water at 298.15 K was found to have the maximum amount of partition coefficient and extraction efficiency.

中文翻译：

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温度对离子液体基水性两相体系相行为的影响及其对2-氯苯酚的萃取效率

摘要 随着对含水两相系统（ATPS）研究的不断深入，含有离子液体（IL）和盐的ATPS在萃取纯化过程中得到了广泛的应用。在这项工作中，评估了 2-氯苯酚在由三氟甲磺酸正丁基吡啶鎓和盐（硫酸铵、磷酸二氢钠）组成的新型 ATPS 中的分配。首先，采用浊点滴定法在四种温度和大气压下实验测定双峰曲线数据。并使用 Merchuk 方程来拟合双节点曲线。然后，使用重量法初步确定连接线数据，并通过离子色谱法确定顶部和底部相中所有离子的浓度，以研究 ATPS 中的离子交换。联络线的可靠性通过 Othmer-Tobias 和 Bancroft 方程进行评估。最后，仔细研究了盐类和温度对相图的影响。此外，为了分析ATPS在萃取中的应用，计算了2-氯苯酚在相同总组成下不同温度下的分配系数。发现由正丁基吡啶鎓三氟甲磺酸盐、硫酸铵和水在 298.15 K 形成的 ATPS 具有最大的分配系数和萃取效率。2-氯苯酚的分配系数是在相同的总组成和不同温度下计算的。发现由正丁基吡啶鎓三氟甲磺酸盐、硫酸铵和水在 298.15 K 形成的 ATPS 具有最大的分配系数和萃取效率。2-氯苯酚的分配系数是在相同的总组成和不同温度下计算的。发现由正丁基吡啶鎓三氟甲磺酸盐、硫酸铵和水在 298.15 K 形成的 ATPS 具有最大的分配系数和萃取效率。