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Received May 15, 2016
Accepted November 10, 2016
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Optimal separation of phenol from model oils by forming deep eutectic solvents with quaternary ammonium salts
Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China 1Department of Chemistry and Chemical Engineering, Inha University, Incheon 402751, Korea
zhutao@tjut.edu.cn
Korean Journal of Chemical Engineering, March 2017, 34(3), 814-821(8), 10.1007/s11814-016-0316-y
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Abstract
Various quaternary ammonium salts are used to separate phenol from model oil by forming deep eutectic solvents (DESs). The results indicate that the types of quaternary ammonium salt ions and the molecular symmetry of quaternary ammonium have obvious influence on recovery for phenol. Tetraethylammonium chloride (TEAC), which contains suitable ions and symmetry reveals highest phenol recovery in the model oil. The separation mechanism is discussed and the structures of DESs (TEAC/Phenol) are proved on Fourier transform infrared transform (FTIR). To recycle TEAC, diethyl ether is used as anti-solvent to precipitate TEAC from TEAC/Phenol system. The structure of regeneration TEAC is proved on FTIR and 1H NMR. The recovery for phenol is decreased from 97.45% to 14.30% with the increase of regeneration times. The optimal separation condition was obtained by response surface methodology at 30 °C (separation temperature) for 40 min (separation time) with 3.75 g TEAC (mass of TEAC) in 10 mL model oil (phenol recovery: 99.3%). In contrast to the traditional methods to separate phenol, this proposed method avoids the use of alkalis and acid, and with less effluent.
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References
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