In this paper, the water + 1-(2-hydroxyethyl)-3-methylimidazolium
chloride ([HOEtMIM]Cl) binary system was studied as a novel alternative
working pair of the absorption heat pump cycle. Thermodynamic properties
of the system including vapor pressure, density, and heat capacity
were measured in the mole fraction range from 0.0122 to 0.3071 of
[HOEtMIM]Cl. The vapor pressures of the binary system were determined
by the boiling-point method in the pressure from (2.82 to 102.29)
kPa and correlated by the nonrandom two-liquid (NRTL) model. The densities
and heat capacities were measured in the temperature range from (298.15
to 323.15) K and (298.15 to 358.15) K, respectively, and correlated
by the polynomial equations on temperature and concentration. The
average relative deviations (ARDs) between the experimental and the
calculated values of vapor pressure, density, and heat capacity are
1.42 %, 0.09 %, and 0.38 %, respectively.
Densities and viscosities of hybrid absorbents piperazine (PZ) (1) + 1-ethyl-3-methyl-imidazolium acetate ([Emim][Ac]) (2) + H 2 O (3) were respectively measured with different mass compositions (w 1 /w 2 /w 3 = 0.
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