Abstract The liquid–liquid equilibriums (LLE) in two ternary systems, {water + 2,3-butanediol + 2-methyl-1-pentanol} and {water + 2,3-butanediol + 3-methyl-1-butanol}, were studied at three temperatures, 298.2 K, 308.2 K, and 318.2 K. To complete the phase diagram, the LLE data and solubility data were obtained. To select a suitable solvent, distribution coefficient (D) and selectivity (S) were calculated. The values of D and S of 2-methyl-1-pentanol were (0.36–0.67) and (3.29–7.97) and those of 3-methyl-1-butanol were (0.44–0.95) and (2.29–5.80), respectively. Compared to the values of previously reported solvents, the values of D and S of 3-methyl-1-butanol were relatively higher. Nonrandom two liquids (NRTL) model was used to correlate the experimental data. All root mean square deviation (RMSD) values were 0.0166 in average, which indicates successful correlations between the experimental data and those obtained from the NRTL model.

中文翻译：

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三元体系{水+2,3-丁二醇+2-甲基-1-戊醇}和{水+2,3-丁二醇+3-甲基-1-丁醇}液-液平衡数据的测量与关联

摘要 {水 + 2,3-丁二醇 + 2-甲基-1-戊醇} 和 {水 + 2,3-丁二醇 + 3-甲基-1-丁醇} 两个三元系统中的液-液平衡 (LLE)，分别在 298.2 K、308.2 K 和 318.2 K 三个温度下进行了研究。为了完成相图，获得了 LLE 数据和溶解度数据。为了选择合适的溶剂，计算了分配系数（D）和选择性（S）。2-甲基-1-戊醇的D和S值分别为（0.36-0.67）和（3.29-7.97），3-甲基-1-丁醇的值分别为（0.44-0.95）和（2.29-5.80） . 与之前报道的溶剂值相比，3-甲基-1-丁醇的 D 和 S 值相对较高。非随机两种液体 (NRTL) 模型用于关联实验数据。所有均方根偏差 (RMSD) 值平均为 0.0166，