Sodium sulfate wastewater is a kind of coal tar processing effluent containing highly concentrated phenol. Owing to its high toxicity, phenol pose a serious threat to the natural environment and human health. In this paper, a novel ternary extractant, tributylphosphane (TBP)/diethyl carbonate (DEC)/cyclohexane, was utilized to extract phenol from the wastewater. The combination of 20% TBP, 20% DEC, and 60% cyclohexane yielded a high extraction efficiency of 99.79% under the suggested conditions (time of 6 min, organic–aqueous volume ratio of 1, pH of 5.05 and temperature of 298.15 K). Fourier-transform infrared spectroscopy analysis illustrates that the extraction of phenol was enabled by intermolecular hydrogen bonding with both TBP and DEC. The stripping of phenol from the phenol-loaded extractant was carried out using an alkali solution, realizing the recovery of phenol resource and the regeneration of extractant. The stripping efficiency reached 96.29% when using 1 mol/L NaOH solution under certain conditions (contact time of 4 min, aqueous–organic volume ratio of 1, and temperature of 313.15 K). Additionally, the pH response analysis shows that the stripping process could be divided into four stages and more than 8 min of contact time leaded to the hydrolysis of the DEC. The ultra-high phenol recovery, up to 99.78%, was achieved from the actual wastewater via a two-stage extraction and back-extraction.

硫酸钠废水是一种含高浓度苯酚的煤焦油加工废水。由于其高毒性，苯酚对自然环境和人类健康构成了严重威胁。本文采用新型三元萃取剂三丁基膦（TBP）/碳酸二乙酯（DEC）/环己烷从废水中提取苯酚。在建议的条件下（时间为6分钟，有机-水体积比为1，pH为5.05和温度为298.15 K），将20％TBP，20％DEC和60％环己烷组合使用可实现99.79％的高萃取效率。 。傅立叶变换红外光谱分析表明，通过与TBP和DEC的分子间氢键键合，可以提取苯酚。使用碱溶液从装有苯酚的萃取剂中汽提苯酚，实现了苯酚资源的回收和萃取剂的再生。在一定条件下（接触时间为4分钟，水-有机物的体积比为1，温度为313.15 K）使用1 mol / L NaOH溶液时，汽提效率达到96.29％。此外，pH响应分析表明，汽提过程可分为四个阶段，超过8分钟的接触时间会导致DEC水解。通过两步萃取和反萃取，从实际废水中获得了高达99.78％的超高酚回收率。pH响应分析表明，汽提过程可分为四个阶段，接触时间超过8分钟导致DEC水解。通过两步萃取和反萃取，从实际废水中获得了高达99.78％的超高酚回收率。pH响应分析表明，汽提过程可分为四个阶段，接触时间超过8分钟导致DEC水解。通过两步萃取和反萃取，从实际废水中获得了高达99.78％的超高酚回收率。