Crystallization Temperature, Vapor Pressure, Density, Viscosity, Specific Heat Capacity, and Corrosivity of the LiNO3-DEG/H2O Ternary System

As a novel working pair to replace CaCl2/H2O and LiNO3/H2O for open absorption heat pumps, LiNO3-DEG/H2O with a mass ratio of 1:4 was further researched on the basis of the overall assessment of the vapor pressure and crystallization temperature. The crystallization temperature, vapor pressure, density, viscosity, and specific heat capacity of the working pair were measured with mass fractions from 0.70 to 0.90. The vapor pressure, density, viscosity, and specific heat capacity were measured from 293.15 to 373.15 K. Regression equations for the experimental values were obtained by a least-squares method. The results showed that the vapor pressures of LiNO3-DEG/H2O with a mass fraction of 0.80 were very close to that of LiNO3/H2O with a mass fraction of 0.50, and the vapor pressures of LiNO3-DEG/H2O with a mass fraction of 0.85 were also very close to that of CaCl2/H2O with a mass fraction of 0.45. Crystallization temperatures of LiNO3-DEG/H2O with a mass fraction from 0.70 to 0.90 were lower than 243 K. Corrosion weight loss values of carbon steel, stainless steel, and copper in an atmosphere of air for LiNO3-DEG/H2O were 1.17 × 10–4, 0.35 × 10–4, and 0.33 × 10–4 g/(cm–2·m–1), respectively, which were much smaller than those for LiNO3/H2O and CaCl2/H2O.