Experimental data on the physicochemical and thermodynamic properties of the aqueous lithium bromide modified by the addition of lithium salt

Abstract

Due to the good performance in absorption systems, lithium bromide plus water solution is the most widely used working pair. The disadvantages of this system, including, in particular, the tendency to crystallize, makes it necessary to search for new solutions. Properly choosing additives to conventional lithium bromide aqueous solution to improve the performance of the cycle is an important part of the lithium bromide absorption refrigeration studies, including ours. This paper is a continuation of our comprehensive research in this area. Mixtures consisting of lithium bromide + lithium acetate + water, and lithium bromide + lithium lactate + water, and lithium bromide + lithium trifluoroacetate + water are thought to be promising alternatives to the conventional system. In this research, the influence of three lithium salts on solubility are presented. Based on solubility measurement, two additives are selected and vapour pressure, and physicochemical properties for {lithium bromide + lithium acetate, or lithium lactate + water} systems is presented. Measurements of vapor pressure, dynamic viscosity, and the liquid density are carried out over a wide range of temperatures and compositions. Empirical equations are used to correlate dynamic viscosity, and density data. Based on the comparison between experimental results presented here and literature data for.a conventional binary system, the effect of the additive on physicochemical and thermodynamic properties is characterized and the possibility of the potential application of such new ternary systems in absorption refrigeration technology is determined.