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

ABSTRACT

1-ethyl-3-methylimidazolium chlorine ([Emim]Cl) and 1-ethyl-3- methylimidazolium bromide ([Emim]Br) as additive to working fluid (lithium bromide aqueous solution (H2O-LiBr) and lithium chloride aqueous solution (H2O-LiCl)) of absorption cycles were proposed. The vapor pressure of H2O + LiCl + [Emim]Cl (mass ratio LiCl/[Emim]Cl =2) in the temperature from 314.79 K to 435.48 K, H2O + LiCl + [Emim]Br (mass ratio LiCl/[Emim]Br =2) in the temperature from 317.62 K and 431.27 K, and H2O + LiBr + [Emim]Cl (mass ratio LiBr/[Emim]Cl =2) in the temperature from 303.10 K to 409.91 K, were measured by boiling point method. The mass fractions of the absorbent were from 0.30 to 0.60. The experimental data were regressed using the Antoine-type equation and the average absolute relative deviation (AARD%) between the experimental data and calculated values of three systems were 0.44%, 0.51% and 0.54%, respectively. Compared with previous reported ILs ([Emim]Ac) as absorbent for LiBr + H2O, vapor pressure of these four systems follows the order LiCl + [Emim]Cl + H2O less than LiCl + [Emim]Br + H2O less than LiBr + [Emim]Cl + H2O less than LiBr + [Emim]Ac +H2O. The proposed ternary systems have better water affinity, and can be promising alternative working fluids in absorption cooling system.