Liquid–liquid phase equilibrium of (piperidinium-based ionic liquid + an alcohol) binary systems and modelling with NRHB and PCP-SAFT

Kamil Paduszyński , Jim Chiyen , Deresh Ramjugernath , Trevor M. Letcher , Urszula Domańska-Żelazna

Abstract

The phase diagrams for binary systems of \1-propyl-1-methylpiperidinium bis\(trifluoromethyl)sulfonyl\imide [PMPIP][NTf2] + an alcohol (butan-1-ol, pentan-1-ol hexan-1-ol, heptan-1-ol, octan-1-ol, decan-1-ol and undecan-1-ol\ have been determined at atmospheric pressure using a dynamic method. The influence of an alcohol chain length is discussed for this ionic liquid (IL). A systematic decrease in the solubility is observed with an increase of the alkyl chain length of an alcohol. Liquid + liquid phase equilibrium (LLE) with an upper critical solution temperature was observed. The phase diagrams reported are compared to systems published earlier with the 1-alkyl-1-methylpiperidinium-based ionic liquid. The basic thermal properties of the pure IL, i.e. melting temperature and the enthalpy of fusion, the glass transition temperature and heat capacity at melting temperature have been measured using a differential scanning microcalorimetry technique. The density of [PMPIP][NTf2] as a function of temperature was measured. The results of the LLE correlation with two models viz. the lattice theory based on non-random hydrogen bonding (NRHB) and the Perturbed-Chain Polar Statistical Associating Fluid Theory (PCP-SAFT) are presented. Both models are capable of describing pure fluid properties of IL (densities and solubility parameters) by using one set of parameters and the LLE in binary systems. This is to our knowledge the first paper presenting the SAFT modelling of binary LLE in ionic liquid systems.
Author Kamil Paduszyński (FC / DPC)
Kamil Paduszyński,,
- Department Of Physical Chemistry
, Jim Chiyen - [University of KwaZulu-Natal School of Chemical Engineering]
Jim Chiyen,,
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, Deresh Ramjugernath - [University of KwaZulu-Natal School of Chemical Engineering]
Deresh Ramjugernath,,
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, Trevor M. Letcher - [University of KwaZulu-Natal School of Chemical Engineering]
Trevor M. Letcher,,
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, Urszula Domańska-Żelazna (FC / DPC)
Urszula Domańska-Żelazna,,
- Department Of Physical Chemistry
Journal seriesFluid Phase Equilibria, ISSN 0378-3812, (A 35 pkt)
Issue year2011
Vol305
No1
Pages43-52
Keywords in English1-Propyl-1-methylpiperidinium bis\(trifluoromethyl)sulfonyl\imide, Alcohols, Experimental liquid + liquid phase equilibria, Non-random hydrogen bonding theory, Perturbed-Chain Polar Statistical Associating Fluid Theory
ASJC Classification1606 Physical and Theoretical Chemistry; 3100 General Physics and Astronomy; 1500 General Chemical Engineering
DOIDOI:10.1016/j.fluid.2011.03.005
URL http://www.sciencedirect.com/science/article/pii/S0378381211001282
Languageen angielski
File
1-s2.0-S0378381211001282-main.pdf 623.1 KB
Score (nominal)35
Publication indicators Scopus Citations = 55; WoS Citations = 54; Scopus SNIP (Source Normalised Impact per Paper): 2011 = 1.235; WoS Impact Factor: 2011 = 2.139 (2) - 2011=2.225 (5)
Citation count*33 (2015-02-26)
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