期刊
JOURNAL OF CHEMICAL THERMODYNAMICS
卷 118, 期 -, 页码 263-273出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2017.12.007
关键词
Separation; Ionic liquids; COSMO-SAC model; Thioglycolic acid; Liquid-liquid equilibrium
资金
- National Scientific Research Fund of China [NSC 21306106]
To separate thioglycolic acid (TGA) from its aqueous solution by ionic liquids (ILs), sixty imidazolium-based ionic liquids (ILs) were screened by using the COSMO-SAC model based on the evaluation of the selectivity, capacity and performance index, which were derived from the activity coefficient at infinite dilution. Meanwhile, the effects of the different anions and the alkyl chain length of the cations for the separation of TGA were analysed by the sigma-profile for each component. Consequently, 1-octyl-3methyl-imidazolium trifluoromethanesulfonate ([OMIM]OTf), 1-octyl-3-methyl-imidazolium perchlorate ([OMIM]ClO4), 1-octyl-3-methyl-imidazolium hexafluorophosphate ([OMIM]PF6) and 1-octyl-3-methyl-imidazolium aluminum tetrachloride ([OMIM]AlCl4), were selected to extract TGA from it aqueous solution. The results revealed that the selected ILs can extract TGA effectively from its aqueous solution. The experimental liquid-liquid equilibrium (LLE) for the four ternary systems ([OMIM]OTf/[OMIM]ClO4/[OMIM]PF6/[OMIM]AlCl4 + TGA + water) were determined. The LLE data for the systems were correlated by the NRTL model, and the results showed that the NRTL model correlated the LLE data nicely for the systems. (C) 2017 Elsevier Ltd.
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