The ternary critical mixture of 1,4-dioxane (1) + water (2) + saturated KCl (3) has a lower critical point. The density rho and refractive index n of this system have been measured as function of temperature for nine critical mixtures along the coexistence curve below the temperature of phase-transition. The water mole fraction in free basis x2 in the mixtures extends from (0.550 to 0.880) and the molality m of KCl from 0.47 to 2.039 mol kg-1. With increase of temperature, water mole fraction and KCl molality, the obtained density decreased, while the refractive index decreases with increase in temperature, water mole fraction and molality of salt. Both represented anomalies near the critical temperature Tc. The molar fraction of critical mixture, increase less than 1 %, with temperature and decrease by 10 %, with water mass fraction and molality of salt. The critical density and the critical refractive index vary linearly with water mass fraction w2 with molality m of KCl as a third degree polynomial. The temperature of separation of phase Tt varies with critical composition in water and molality of KCl.
Compounds
#
Formula
Name
1
C4H8O2
1,4-dioxane
2
H2O
water
3
ClK
potassium chloride
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.