Needle coke wastewater is rich in phenol and poses a great challenge to industrial implementation of phenol extraction because of the low extraction capacity of current industrial extractants. In this paper, the synergistic extraction of phenol from aqueous solution with a mixture of methyl isobutyl ketone (MIBK) and n-pentanol (n-PTL) was investigated. Liquid–liquid equilibrium data of the quaternary system (MIBK + n-PTL + phenol + water) was measured at 298.2 K and 101 kPa by varying the compositions of synergistic solvents. The results show that it performs the highest distribution coefficient, as the ratio of MIBK and n-PTL reaches 8:2 by the low mass fraction of phenol in the aqueous phase. The tie-line lengths are calculated to estimate the size of the immiscibility zone. The root-mean-square deviations (RMSDs) show that the regressed results are well consistent with the experimental data when correlating with nonrandom two-liquid (NRTL) and universal quasichemical (UNIQUAC) models, and the corresponding binary interaction parameters are obtained.

中文翻译：

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101 kPa和298.2 K时的季（甲基异丁酮+正戊醇+苯酚+水）系统的液-液相平衡和数据关联：协同溶剂与苯酚的共萃取

针状焦废水中富含苯酚，由于目前工业萃取剂的萃取能力低，对苯酚萃取的工业实施提出了巨大挑战。本文研究了甲基异丁基酮（MIBK）和正戊醇（n -PTL）混合物从水溶液中协同萃取苯酚的方法。通过改变协同溶剂的组成，在298.2 K和101 kPa下测量了四元体系（MIBK + n -PTL +苯酚+水）的液-液平衡数据。结果表明，随着MIBK与n的比值，它表现出最高的分配系数。-PTL由于水相中苯酚的质量分数低而达到8：2。计算联络线长度以估计不混溶区的大小。均方根偏差（RMSDs）表明，与非随机二液（NRTL）模型和通用拟化学（UNIQUAC）模型相关时，回归结果与实验数据吻合良好，并获得了相应的二元相互作用参数。