THERMAL-ANALYSIS OF THE SYSTEM KCL-LICL BY DIFFERENTIAL SCANNING CALORIMETRY

Thermal analysis of the binary system KCl-LiCl in the composition rang e 0.368-0.812 mol fraction of LiCl was studied by differential scannin g calorimetry (DSC). On the basis of the DSC curves, the experimental data for the phase-diagram, the latent heat of fusion, and the average specific heat in the liquid and solid slates are presented as a funct ion of the composition of the mixture. The experimental results compar ed with literature data. The following empirical correlation between t he heat of fusion (Delta H) and of compositions of the mixture in mol fraction of LiCl (x) was obtained: Delta H = 26.95 - 50.20x + 43.06 x (2) with a minimum value of 11.8 kJ(g mol)(-1) at the eutectic point o f 0.587 mol fraction of LiCl at 354.4 degrees C. These results are req uired as basic data to develop thermal energy storage materials, based on the phase change of a molten mixture of KCl-LiCl.