Abstract The efficient extraction of acetic acid from dilute aqueous solution is of both research and industrial value. In order to search for acetic acid extractants, the liquid-liquid equilibrium of the ternary system (water + acetic acid + 2-heptanol) was studied at temperatures ranging from 303.2 K to 323.2 K. According to experimental results, 2-heptanol showed high extraction capability and low water miscibility. It is also observed that the distribution coefficient and the separation factor are insensitive to temperature, which facilitates the practical operation. The authenticity of phase equilibrium data was validated by Othmer-Tobias equation and Hand equation. Experimental data were also correlated with NRTL and UNIQUAC models, and binary interaction parameters of ternary system were obtained. Both NRTL model and UNIQUAC model showed high agreement with the experimental data, with NRTL model more accurate than UNIQUAC model.

中文翻译：

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(水+醋酸+2-庚醇)三元体系的液-液平衡研究

摘要 从稀水溶液中高效提取乙酸具有研究和工业价值。为了寻找醋​​酸萃取剂，研究了三元体系（水+醋酸+2-庚醇）在303.2K~323.2K温度范围内的液-液平衡。根据实验结果，2-庚醇表现出高萃取能力和低水混溶性。还观察到分配系数和分离因子对温度不敏感，这有利于实际操作。Othmer-Tobias方程和Hand方程验证了相平衡数据的真实性。实验数据还与NRTL和UNIQUAC模型相关联，得到了三元系统的二元相互作用参数。