The density, dynamic viscosity, and heat capacity of ammonia + lithium nitrate and ammonia + lithium nitrate + water mixtures were measured between (293.15 and 353.15) K at 1.8 MPa, using a vibrating-tube densimeter, a piston-style viscosimeter, and a heat flux Calvet-type calorimeter, respectively. The measured data were correlated as a function of temperature and composition using simple polynomial equations. Kinematic viscosity data of binary and ternary mixtures were also determined.
The vapor pressure of ammonia + lithium nitrate + water and ammonia + lithium nitrate mixtures was measured by a static method from (293.15 to 353.15) K in ammonia mass fractions ranging from 0.2 to 0.6. The experimental vapor pressure data were correlated with the temperature and the liquid-phase composition using an analytical polynomial equation. The capability of the electrolyte nonrandom two liquid (E-NRTL) model to predict the vapor-liquid equilibrium (VLE) of the ternary mixture was evaluated by comparing predicted and experimental data of the ammonia + lithium nitrate + water solutions. The binary interaction parameters of ammonia + lithium nitrate needed for the prediction of ternary VLE were determined from binary experimental data.
Ammonia + water + sodium hydroxide and ammonia + water + potassium hydroxide mixtures were chosen as
potential candidates for absorption chillers driven by low-temperature heat sources. Heat capacity and density
were studied between (293.15 and 353.15) K at a constant pressure of 1.8 MPa for these solutions using a heat
flux Calvet-type calorimeter and a vibrating-tube densimeter, respectively. Measured data were well-correlated
with temperature and composition using simple polynomial equations. The relative deviations between the
experimental and calculated values in the density and heat capacity measurements were 0.20 % and 0.49 % for
NH3 + H2O + NaOH solutions and 0.10 % and 0.36 % for NH3 + H2O + KOH solutions, respectively. Also,
two density prediction methods were checked using the experimental data. Previously, it was necessary to measure
the density of ammonia and hydroxide aqueous solutions in similar conditions. The results showed that both
methods are suitable for predicting the density of these solutions.
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