Vapor-liquid equilibria and volumetric properties for new working fluid ([C6H11N2][HSO4] + LiBr + H2O) and corresponding binary systems at different temperatures and ambient pressure

Abstract Vapor-liquid equilibrium of aqueous [C 6 H 11 N 2 ][HSO 4 ] and LiBr systems and the ternary ([C 6 H 11 N 2 ][HSO 4 ] + LiBr + H 2 O) system are studied at T  = 298.15 K. Isopiestic method applied to obtain the water activity, osmotic coefficient, activity coefficient and vapor pressure. For binary mixtures, the different models such as Pitzer, Pitzer – Archer and Modified- Pitzer models are fitted to the osmotic coefficients data, and for the studied ternary system, we used the Scatchard's natural electrolyte model to correlate the osmotic coefficients values at T  = 298.15 K. The effect of [C 6 H 11 N 2 ][HSO 4 ] on volumetric properties of aqueous LiBr solutions is considered. Limiting apparent molar expansibilities are obtained and McMillan-Meyer parameters are evaluated.

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