Binodal curves of the aqueous 1-butyl-3-methylimidazolium tetrafluoroborate([C4mim]BF4) + kosmotropic salt (Na3PO4,(NH4)3PO4) + water aqueous two-phase systems were determined experimentally at 288.15, 298.15, 308.15 and 318.15 K. Three empirical equations were used to correlate the binodal data. All three empirical equations reproduce the data with a high degree of precision. The effect of temperature on the binodal curves was studied. Corresponding to two different salts, the two-phase area decreases with increasing temperature. From the binodal model for these systems, the effective excluded volumes (EEV) were obtained. The binodal curves and EEV both indicate that the salting-out abilities are in the order: Na3PO4 > (NH4)3PO4. And, the reliability of the tie-line compositions was proved by the empirical correlation with the Othmer–Tobias and Bancroft equations. The results show that the salting-out strength is greater at lower temperatures. Additionally, a relatively simple two-parameter equation was used for the correlation of the tie-line data.

中文翻译：

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咪唑鎓离子液体+磷酸盐+水水两相体系的液-液平衡及相关性

在 288.15、298.15、308.15 和 318.15 K 处通过实验确定了水性 1-丁基-3-甲基咪唑鎓四氟硼酸盐 ([C4mim]BF4) + 亲液盐 (Na3PO4,(NH4)3PO4) + 水性两相系统的双节曲线三个经验方程用于关联双节点数据。所有三个经验方程都以高精度再现数据。研究了温度对双节点曲线的影响。对应于两种不同的盐，两相面积随温度升高而减小。从这些系统的双节点模型中，获得了有效排除体积 (EEV)。双节点曲线和 EEV 均表明盐析能力的顺序为：Na3PO4 > (NH4)3PO4。和，通过与 Othmer-Tobias 和 Bancroft 方程的经验相关性证明了联络线成分的可靠性。结果表明，盐析强度在较低温度下较大。此外，还使用了一个相对简单的双参数方程来计算联络线数据的相关性。