Abstract
The principal aim of this work is to study azeotropy breaking in the refrigerant blends with ionic liquids (IL). The global phase diagram approach is applied to correlate azeotropic data for binary mixtures based only on critical properties and acentric factor of the individual components in mixtures. Analytical expressions to predict azeotropy phenomena in terms of critical parameters of pure components and binary interaction parameters are given. The eventual azeotropy appearance in the refrigerant - IL blends is discussed and conclusion about highly improbable azeotropic blend formation for these systems is given. Global phase behavior of ionic liquid - industrial refrigerant blends is analyzed and possible III, IV and/or V types according to the classification scheme of Scott and van Konynenburg [1] are established. The azeotropy breaking in binary refrigerant mixtures with ionic liquid adding is predicted.
Highlights
Ionic liquids (IL) are one of prospective new working media for different environmentally friendly technologies
There are many studies published by Aki et al [2], Ren et al [3], Shiflett and Yokozeki [4,5,6,7,8,9,10,11,12], Shiflett et al [13,14,15], Yokozeki and Shiflet [16], Raeissi et al [17] and others where phase equilibria measurements for refrigerants R23, R125, R41, R134a, R143a, R152a, R161, R744 R717 with different ionic liquids were carried out
We review the global phase behavior of binary mixtures and give an analytical expression for azeotropy selection criterion for the Soave – Redlich – Kwong (SRK) model [18], [19]
Summary
Ionic liquids (IL) are one of prospective new working media for different environmentally friendly technologies. The ILs detect a selective solubility for particular components in fluid mixtures and can serve as extraction media in separation of ozone depleting refrigerant blends. ILs are tunable working fluids as far as a variation of different «R – » groups and sufficient selection of cation/anion ratio allow to meet a desired trade off solution among density, viscosity, melting point, and other physicochemical properties. There are many studies published by Aki et al [2], Ren et al [3], Shiflett and Yokozeki [4,5,6,7,8,9,10,11,12], Shiflett et al [13,14,15], Yokozeki and Shiflet [16], Raeissi et al [17] and others where phase equilibria measurements for refrigerants R23, R125, R41, R134a, R143a, R152a, R161, R744 R717 with different ionic liquids were carried out
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