文献类型：期刊文献

英文题名：Efficient recovery of phenol from coal tar processing wastewater with tributylphosphane/diethyl carbonate/cyclohexane: Extraction cycle and mechanism study

作者：Yang, Xiaoyong[1];Wang, Bingjie[1];Luo, Huiqing[1];Yan, Shenglin[1];Dai, Jian[1];Bai, Zhishan[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai, Peoples R China

年份：2020

卷号：157

起止页码：104

外文期刊名：CHEMICAL ENGINEERING RESEARCH & DESIGN

收录：;EI(收录号：20201208321020);WOS:【SCI-EXPANDED(收录号:WOS:000528193200010)】；

基金：We acknowledge the support by the National Natural Science Foundation of China, China (51578239), the Joint Fundof the equipment pre Research Ministry of Education, China(6141A02033204) and the Scientific Research Projects of Shanghai, China (17DZ1202802).

语种：英文

外文关键词：Coal tar processing effluent; Phenol recovery; Ternary extractant; Extraction cycle; Mechanism analysis

摘要：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. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.