Vapor-liquid-solid phase transitions in aqueous sodium sulfate and sodium carbonate from heat capacity measurements near the first critical end point. 1. Sodium sulfate
Im. Abdulagatov et al., Vapor-liquid-solid phase transitions in aqueous sodium sulfate and sodium carbonate from heat capacity measurements near the first critical end point. 1. Sodium sulfate, J CHEM EN D, 45(6), 2000, pp. 1133-1138
Heat capacities at constant volume and composition are reported for aqueous
sodium sulfate for three compositions, 1 mass %, 5 mass %, and 10 mass %,
respectively, and along 19 isochores, from 250 kg .m(-3) to 1073 kg .m(-3)
in the temperature range from 350 K to 670 a. In the range from 630 K to 65
0 K, many of these isochores display two features in the heat capacity as a
function of the temperature: one peak or step when solid salt first precip
itates and, on further heating, a lambda -shaped peak when the vapor- or li
quid-phase disappears. In Part 2 of this paper, these features will be inte
rpreted.