Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 40, Issue 8, Pages 1282-1289Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2008.03.011
Keywords
(Liquid plus liquid) equilibrium; Physical properties; Azeotropes; HMIM PF6; OMIM PF6
Categories
Funding
- Ministerio de Educacion y Ciencia (Spain) [CTQ 2004-00454]
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Experimental densities, speeds of sound, and refractive indices of the binary mixtures of 2-butanone with cyclohexane and OMIM PF6 (1-methyl-3-octylimidazolium hexafluorophosphate) were determined from T = (293.15 to 303.15) K, since they are necessary to determine the (liquid + liquid) equilibrium. Excess molar volumes, changes of refractive index on mixing, and deviations in isentropic compressibility for the above systems were calculated. Experimental (liquid + liquid) equilibrium of the ternary mixtures (cyclohexane + 2-butanone + 1-hexyl-3-methylimidazolium hexafluorophosphate (HMIM PF6)) and (cyclohexane + 2-butanone + OMIM PF6) were carried out to assess the suitability of HMIM PF6 and OMIM PF6 as azeotrope breaker of the mixture cyclohexane and 2-butanone. Selectivity and distribution ratio derived from the tie lines data, were presented in order to analyze the best separation solvent values, in a liquid extraction process. Experimental (liquid + liquid) equilibrium data were compared with the correlated values obtained by means of the NRTL and UNIQUAC models. (C) 2008 Elsevier Ltd. All rights reserved.
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