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Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids

The separation of benzene and cyclohexane is a challenging process in petrochemical industry due to their close boiling points. Solvent mixing is a useful technique to enhance the extraction performance of liquid–liquid extraction process. In this work, the performance of solvent mixtures involving...

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Main Authors:	Salleh, M. Zulhaziman M., Hadj-Kali, M.K., Wazeer, Irfan, Ali, Emad, Hashim, Mohd Ali
Format:	Article
Published:	Elsevier 2019
Subjects:	TP Chemical technology
Online Access:	http://eprints.um.edu.my/23551/ https://doi.org/10.1016/j.molliq.2019.04.095
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spelling	my.um.eprints.235512020-01-23T07:59:38Z http://eprints.um.edu.my/23551/ Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids Salleh, M. Zulhaziman M. Hadj-Kali, M.K. Wazeer, Irfan Ali, Emad Hashim, Mohd Ali TP Chemical technology The separation of benzene and cyclohexane is a challenging process in petrochemical industry due to their close boiling points. Solvent mixing is a useful technique to enhance the extraction performance of liquid–liquid extraction process. In this work, the performance of solvent mixtures involving two organic solvents (N,N-dimethylformamide and ethylene glycol) and four ionic liquids (ILs), namely, 1-ethyl-3-methylimidazolium thiocyanate (C2mimSCN), 1-ethyl-3-methylimidazolium dicyanamide (C2mimN(CN)2), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mimTf2N) and 1-ethyl-3-methylimidazolium acetate (C2mimAc) was investigated for the extractive separation of benzene and cyclohexane. The mixing ratios of the binary solvents were optimized using the ideal mixing calculation and validated experimentally through liquid–liquid extraction process. Six new quaternary liquid–liquid equilibria for the mixed solvents with benzene and cyclohexane were investigated at 25 °C and 1 atm, with feed concentrations of benzene ranging from 10 to 50 wt%. Ethylene glycol was discovered a good solvent pair with C2mimTf2N that could lead to potential cost savings. At the optimized mixing fraction, the {C2mimTf2N + C2mimSCN} mixture demonstrated the highest extraction performance, which was superior to that of sulfolane. Additionally, the {C2mimSCN + C2mimN(CN)2} and {C2mimN(CN)2 + C2mimAc} mixtures were found to increase the selectivity while maintaining the benzene distribution ratio in relation to sulfolane. The ILs were not present in the raffinate layer of any of the systems, indicating the reliable performance of the ILs in terms of avoiding solvent cross-contamination. This work demonstrated the use of binary solvent mixtures as a new efficient and versatile method to enhance extraction performance. © 2019 Elsevier B.V. Elsevier 2019 Article PeerReviewed Salleh, M. Zulhaziman M. and Hadj-Kali, M.K. and Wazeer, Irfan and Ali, Emad and Hashim, Mohd Ali (2019) Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids. Journal of Molecular Liquids, 285. pp. 716-726. ISSN 0167-7322 https://doi.org/10.1016/j.molliq.2019.04.095 doi:10.1016/j.molliq.2019.04.095
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	TP Chemical technology
spellingShingle	TP Chemical technology Salleh, M. Zulhaziman M. Hadj-Kali, M.K. Wazeer, Irfan Ali, Emad Hashim, Mohd Ali Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids
description	The separation of benzene and cyclohexane is a challenging process in petrochemical industry due to their close boiling points. Solvent mixing is a useful technique to enhance the extraction performance of liquid–liquid extraction process. In this work, the performance of solvent mixtures involving two organic solvents (N,N-dimethylformamide and ethylene glycol) and four ionic liquids (ILs), namely, 1-ethyl-3-methylimidazolium thiocyanate (C2mimSCN), 1-ethyl-3-methylimidazolium dicyanamide (C2mimN(CN)2), 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mimTf2N) and 1-ethyl-3-methylimidazolium acetate (C2mimAc) was investigated for the extractive separation of benzene and cyclohexane. The mixing ratios of the binary solvents were optimized using the ideal mixing calculation and validated experimentally through liquid–liquid extraction process. Six new quaternary liquid–liquid equilibria for the mixed solvents with benzene and cyclohexane were investigated at 25 °C and 1 atm, with feed concentrations of benzene ranging from 10 to 50 wt%. Ethylene glycol was discovered a good solvent pair with C2mimTf2N that could lead to potential cost savings. At the optimized mixing fraction, the {C2mimTf2N + C2mimSCN} mixture demonstrated the highest extraction performance, which was superior to that of sulfolane. Additionally, the {C2mimSCN + C2mimN(CN)2} and {C2mimN(CN)2 + C2mimAc} mixtures were found to increase the selectivity while maintaining the benzene distribution ratio in relation to sulfolane. The ILs were not present in the raffinate layer of any of the systems, indicating the reliable performance of the ILs in terms of avoiding solvent cross-contamination. This work demonstrated the use of binary solvent mixtures as a new efficient and versatile method to enhance extraction performance. © 2019 Elsevier B.V.
format	Article
author	Salleh, M. Zulhaziman M. Hadj-Kali, M.K. Wazeer, Irfan Ali, Emad Hashim, Mohd Ali
author_facet	Salleh, M. Zulhaziman M. Hadj-Kali, M.K. Wazeer, Irfan Ali, Emad Hashim, Mohd Ali
author_sort	Salleh, M. Zulhaziman M.
title	Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids
title_short	Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids
title_full	Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids
title_fullStr	Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids
title_full_unstemmed	Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids
title_sort	extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids
publisher	Elsevier
publishDate	2019
url	http://eprints.um.edu.my/23551/ https://doi.org/10.1016/j.molliq.2019.04.095
_version_	1657488226405842944
score	13.211869

Extractive separation of benzene and cyclohexane using binary mixtures of ionic liquids

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