Effect of mono-, di- and tri-ethanolammonium tetrafluoroborate protonic ionic liquids on vapour liquid equilibria of ethanol aqueous solution

Vapour pressures were measured using a quasi-static ebulliometer for the binary mixture of (water + ethanol) containing one of three protonic ionic liquids (PIL), namely, mono-, di- or tri-ethanolammonium tetrafluoroborate, over the temperature range of (318.24 to 356.58) K at fixed PIL content of 0...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 2011-03, Vol.43 (3), p.452-457
Main Authors: Shen, Chong, Ma, Xiao-yan, Lu, Ying-zhou, Li, Chun-xi
Format: Article
Language:English
Subjects:
Chemistry
Ethanol
Ethyl alcohol
Exact sciences and technology
General and physical chemistry
Ionic liquids
Isobaric vapour liquid equilibria
Liquid-vapor equilibria
Liquids
Mathematical analysis
NRTL equation
Phase equilibria
Protonic ionic liquid
Vapor pressure
Vapour
Vapour pressure
Volatility
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Summary:Vapour pressures were measured using a quasi-static ebulliometer for the binary mixture of (water + ethanol) containing one of three protonic ionic liquids (PIL), namely, mono-, di- or tri-ethanolammonium tetrafluoroborate, over the temperature range of (318.24 to 356.58) K at fixed PIL content of 0.30 in mass fraction. The vapour pressure data of the PIL-containing ternary systems were correlated using the NRTL equation with an overall root mean square deviation (RMSD) of 0.0092. The regressed NRTL parameters were used to predict the isobaric vapour liquid equilibria (VLE) for ternary systems (water + ethanol + PIL) at varying mass fraction of PIL and atmospheric pressure (101.3 kPa). It is shown that the effect of PILs on the VLE of the (water + ethanol) mixture follows the order: [HTEA][BF 4] > [HDEA][BF 4] > [HMEA][BF 4]. In addition, the relative volatilities of ethanol to water for pseudo-binary systems (water + ethanol + PIL) were calculated. The results indicate that the PILs studied can enhance the relative volatility of ethanol to water and even break the azeotropic behaviour of ethanol aqueous solution when PIL content is increased to a specified content.
ISSN:0021-9614
1096-3626
DOI:10.1016/j.jct.2010.10.019