Vapor–Liquid Equilibria for R1234ze(E) and Three Imidazolium-Based Ionic Liquids as Working Pairs in Absorption–Refrigeration Cycle

Abstract

The thermodynamic properties of a working-fluid pair, composed of a refrigerant and an absorbent, greatly influence the performance of an absorption−refrigeration cycle. Particularly important is the solubility of the vaporized refrigerant in the absorbent. Using an isochoric saturation method, solubilities were measured for trans-1,3,3,3-tetrafluoropropeneand 1-methyl-3-octylimidazolium hexafluorophosphate ([Omim][PF 6 ]) from 283.15 to 343.15 K. Solubilities rise with a decrease in temperature and an increase in pressure. The highest solubility is in [Omim][PF 6 ], followed by [Hmim][PF 6 ], and [Bmim][PF 6 ]. The new data were correlated by the nonrandom two-liquid model and by the Krichevsky−Ilinskays equation; both provide good agreement with the experimental data. Estimates were given for total enthalpy, entropy, and Gibbs energy of dissolution.

Vapor–Liquid Equilibria and Diffusion Coefficients of Difluoromethane, 1,1,1,2-Tetrafluoroethane, and 2,3,3,3-Tetrafluoropropene in Low-Viscosity Ionic Liquids

“…Although can be treated as an adjustable parameter, for the case of hydrocarbons and fluorocarbons is usually assumed constant and equal to 0.2, a convention that we followed for consistency with previous works. 10,49,54 Thus, only the temperature-dependent binary interaction parameters and were optimized in this work. Out of them, and Nevertheless, in the present work, the equilibria of most of the systems were accurately described using two adjustable parameters, and only the absorption of R1234yf in [C 2 mim][OTf] required all four parameters due to its very low solubility.…”

Solubility for Propane and Isobutane in [P66614]Cl from 278.15 to 348.15 K

“…Figure shows the self-built solubility apparatus based on the isochoric saturated principle. The experimental system has been described in our previous papers. , Here, we only give the main characteristics. The experimental system primarily consists of the equilibrium cell, vapor cell, vacuum equipment and data acquisition.…”

“…Small equipment volume is needed using R32/[hmim]­[Tf 2 N] and R152a/[hmim]­[Tf 2 N] pairs owing to the evaporation pressure, particularly the pressure for R32/[hmim]­[Tf 2 N] is about 2 orders of magnitude higher than that in H 2 O/LiBr systems. Our research group − has also carried out a series of experiments on refrigerant/IL working pairs.…”

Comparison of CP-PC-SAFT and SAFT-VR-Mie in Predicting Phase Equilibria of Binary Systems Comprising Gases and 1-Alkyl-3-methylimidazolium Ionic Liquids

“…R134a ]. Points-experimental data [11,12,15,16,74,[78][79][80]. Solid linespredictions of CP-PC-SAFT, dashed lines-predictions of SAFT-VR-Mie.…”

“…Phase equilibria in the systems of R134a and R1234ze(E) dissolved in [C 2 mim][NTf 2 ], [C 6 mim][NTf 2 ], [C 8 mim][NTf 2 ], [C 8 mim][BF 4 ], and [C 4 mim][PF 6 ]. Points-experimental data[11,12,15,16,74,[78][79][80]. Solid linespredictions of CP-PC-SAFT, dashed lines-predictions of SAFT-VR-Mie.…”