Use of water in aiding olefin/paraffin (liquid + liquid) extraction via complexation with a silver bis(trifluoromethylsulfonyl)imide salt

Yu Wang, Jillian Thompson, Jingjing Zhou, Peter Goodrich, Mert Atilhan, Alfonso S. Pensado, Barbara Kirchner, David Rooney*, Johan Jacquemin, Majeda Khraisheh

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Citations (Scopus)

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, Ag[Tf2N]) to form room temperature ionic liquids [Ag(olefin)x][Tf2N]. From the experimental (liquid + liquid) equilibrium data for the olefin/paraffin mixtures and Ag[Tf2N], 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 Ag[Tf2N] 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.

Original languageEnglish
Pages (from-to)230-240
Number of pages11
JournalThe Journal of Chemical Thermodynamics
Volume77
Early online date15 Feb 2014
DOIs
Publication statusPublished - Oct 2014
Event5th Congress on Ionic Liquids (COIL) - Vilamoura, Portugal
Duration: 21 Apr 201325 Apr 2013

Keywords

  • Olefin/paraffin separation
  • Ionic liquid
  • (Liquid plus liquid) extraction
  • Spectroscopy
  • DFT and UNIQUAC calculations
  • IONIC LIQUIDS
  • N-HEXANE
  • ACETYLENE COMPLEXES
  • TRANSITION-METALS
  • ORGANIC-COMPOUNDS
  • PHASE-EQUILIBRIA
  • TERNARY-SYSTEMS
  • SEPARATION
  • OLEFIN
  • DENSITY

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