Use of water in aiding olefin/paraffin (liquid + liquid) extraction via complexation with a silver bis(trifluoromethylsulfonyl)imide salt |
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| Institution: | 1. The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen’s University, Stranmillis Road, Belfast, Northern Ireland BT9 5AG, UK;2. Department of Chemical Engineering, Qatar University, Doha, Qatar;3. Wilhelm-Ostwald Institute of Physical and Theoretical Chemistry, University of Leipzig, Linnestr. 2, D-04103 Leipzig, Germany;1. Department of Chemistry, Faculty of Sciences, University of Hormozgan, Bandar Abbas, 71961, Iran;2. Department of Chemistry, Shiraz University of Technology, Shiraz, 71555-313, Iran;3. Department of Chemistry, Shiraz University, Shiraz, 71454, Iran;1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China;2. National Paper Products Quality Supervision Inspection Center, Dongguan, China;1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;2. Dipartimento di Chimica, Università della Calabria, 87030 Arcavacata di Rende, Italy;1. Novel Drug Delivery Research Center, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Islamic Republic of Iran;2. Department of Medicinal Chemistry, Faculty of Pharmacy, Kermanshah University of Medical Sciences, Kermanshah, Islamic Republic of Iran |
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| Abstract: | This paper describes the extraction of C5–C8 linear α-olefins from olefin/paraffin mixtures of the same carbon number via a reversible complexation with a silver salt (silver bis(trifluoromethylsulfonyl)imide, AgTf2N]) to form room temperature ionic liquids Ag(olefin)x]Tf2N]. From the experimental (liquid + liquid) equilibrium data for the olefin/paraffin mixtures and AgTf2N], 1-pentene showed the best separation performance while C7 and C8 olefins could only be separated from the corresponding mixtures on addition of water which also improves the selectivity at lower carbon numbers like the C5 and C6, for example. Using infrared and Raman spectroscopy of the complex and AgTf2N] saturated by olefin, the mechanism of the extraction was found to be based on both chemical complexation and the physical solubility of the olefin in the ionic liquid (Ag(olefin)x]Tf2N]). These experiments further support the use of such extraction techniques for the separation of olefins from paraffins. |
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| Keywords: | Olefin/paraffin separation Ionic liquid Spectroscopy DFT and UNIQUAC calculations |
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