An aqueous two-phase system (ATPS) containing an ionic liquid (1-(2-methoxyethyl)-3-methylimidazolium bromide) and three organic salts (K 3 C 6 H 5 O 7 , (NH 4 ) 3 C 6 H 5 O 7 , and K 2 C 4 H 4 O 6 ) at different temperatures was designed. Binodal data were correlated using two empirical equations, and tie-line data were fit with the utilization of Bancroft and Othmer-Tobias equations. In the systems investigated, three conclusions were drawn from the study of the phase-forming ability of salt through effective excluded volume, Gibbs free energy of ions, and the phase diagram. First, if the same cations of salt were present, the ability of salt to form phases increased with increasing valence of the anion. Second, the larger the effective excluded volume, the stronger the aforementioned ability of salt in forming phases. Third, salt had more ability to form phases if cations (or anions) contained in the salt possessed higher negative Gibbs free energy when the cation (anion) of the salt was the same. The effect of temperature on ATPSs was also investigated. It was found that it was easier to form ATPSs at lower temperature, and the tie-line slope showed growing absolute values as the temperature was decreased.

中文翻译：

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不同温度下含有离子液体（[EOMiM]Br）和柠檬酸钾/柠檬酸铵/酒石酸钾的水性两相体系中相平衡的测量和相关性

包含离子液体（1-（2-甲氧基乙基）-3-甲基咪唑溴化物）和三种有机盐（K 3 C 6 H 5 O 7 、(NH 4 ) 3 C 6 H 5 ）的水性两相系统 (ATPS) O 7 和 K 2 C 4 H 4 O 6 ) 在不同温度下进行了设计。双节点数据使用两个经验方程相关联，连接线数据使用 Bancroft 和 Othmer-Tobias 方程拟合。在所研究的系统中，通过有效排除体积、离子的吉布斯自由能和相图从研究盐的相形成能力中得出三个结论。首先，如果存在相同的盐阳离子，则盐形成相的能力随着阴离子化合价的增加而增加。其次，有效排除体积越大，上述盐形成相的能力越强。第三，当盐的阳离子（阴离子）相同时，如果盐中所含的阳离子（或阴离子）具有较高的负吉布斯自由能，则盐具有更大的成相能力。还研究了温度对ATPS的影响。发现在较低温度下更容易形成ATPS，并且连接线斜率显示出随着温度降低而增加的绝对值。