Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The performance of absorption-refrigeration cycle mainly depends on the thermodynamic properties of a working-fluid pair composed of a refrigerant and an absorbent. 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-tetrafluoropropene (R1234ze(E)) in 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]), 1-hexyl-3-methylimidazolium hexafluorophosphate ([Hmim][PF6]), and 1-methyl-3-octylimidazolium hexafluorophosphate ([Omim][PF6]) from 283.15 to 343.15 K. Solubilities rise with a decrease in temperature and an increase in pressure. Highest solubility is in [Omim][PF6], followed by [Hmim][PF6], and [Bmim][PF6]. The new data were correlated by the NRTL model and by the Krichevsky-Ilinskays equation; both provide good agreement with the experimental data. Estimates are given for mixing enthalpy, entropy and Gibbs energy of dissolution.