Solubility Equilibria of Sodium Sulfate at Temperatures of 150 to 350°. I. Effect of Sodium Hydroxide and Sodium Chloride¹

Thermodynamic representation of the NaCl+Na2SO4+H2O system with electrolyte NRTL model

“…5 along with the experimental data of Likke and Bromley [19]. The model results are satisfactory up to 473.15 K. [43] 273.15 1 (1) Andreeva [44] 298.15 1 (1) Papadimitriou and Koutsoukos [45] 291.15 1 (1) Schroeder et al [46] 413.15-623.15 23 (0) Wuite [47] 288.15-592.15 25 (17) Rumpf and Maurer [48] 312.88-393.18 0.0087-0.187 5 (0) DiPippo et al [49] 594. 15 Based on the calculated solubilities of the sodium chloride solids, the transition point between NaCl (s) and NaCl·2H 2 O (s) at 0.1 MPa is estimated to be 273.5 K, close to the 273.2 K value reported by Sawamura et al [20].…”

“…Titova and Kolmakova [43], Andreeva [44] and Papadimitriou and Koutsoukos [45] reported the solubility data of Na 2 SO 4 ·10H 2 O (s) . Schroeder et al [46] reported the solubility data of Na 2 SO 4(s) . Wuite [47] reported the solubility data for both Na 2 SO 4(s) and Na 2 SO 4 ·10H 2 O (s) .…”

Phase Equilibria in Binary and Ternary Hydrothermal Systems

“…In the following group of apparatus, so called 'hydrothermal bombs with sampler devices', some of the above-mentioned problems were solved by using a hermetic sampler, a component of the hydrothermal bomb that is placed in a hot part of the apparatus (Waldeck et al, 1932;Schroeder et al, 1935;Ravich and Borovaya, 1959;Ravich and Yastrebova, 1961;Bernshtain andMatsenok, 1961, 1965;Itkina, 1973;Ravich, 1974;Broadbent et al, 1977). The pressure drop takes place at the moment of opening the empty sampler after equilibration of the hydrothermal mixture.…”

“…The sampler channel is opened for a few minutes and the liquid phase, after fl owing through a dense fi lter, is injected into the empty sampler. Stainless steel mesh or frit (Schroeder et al, 1935;Stephan and Miller, 1962;Ulmer, 1971;Susarla et al, 1987), sintered Tefl on (Dickson et al, 1963), porous ceramics (Voigt et al, 1985) or a fi ne silver wire (Bernshtain andMatsenok, 1961, 1965;Itkina, 1973;Ravich, 1974;Valyashko, 1990) pressed into the sampler channel have all been used as fi ltering materials. Extension tubes (9) in Figure 1.4(a) are clamped to the sampler to allow sampling of solutions from a certain level of liquid, and are important for studying compositions of immiscible liquids.…”

Osmotic and activity coefficients of sodium sulphate in water from 150 to 250 °C

“…The temperature of the bath was measured by a platinum resistance thermometer. The saturation concentration values were taken from the literature (20).…”