Osmotic coefficients of some aqueous sodium chloride solutions at high temperature

Abstract

The vapour pressure of 1 m sodium chloride solution has been remeasured, and 0.5 m sodium chloride has been measured relative to water to obtain osmotic coefficients ' p from 125 to 270°C. The data obtained have been fitted, in conjunction with those previously obtained, to an extended Debye-Hiickel equation. Activity coefficients, relative partial molal enthalpies and relative partial molal heat capacities have been calculated at 1, 2 and 3 m over the temperature range 60-270°C.

Vapor pressures and isopiestic molalities of concentrated CaCl2(aq), CaBr2(aq), and NaCl(aq) to T=523 K

“…The osmotic coefficients for NaCl obtained in this work from directly measured vapor pressures at T = (473.15, 498.15, and 523.15) K are compared with the literature data in figure 2. The only results available for direct comparison in the high molality region, m > 4.5 mol AE kg À1 , are those of Liu and Lindsay [46], at all three temperatures, and those and Mashovets et al [47] at T = (473.15 and 523.15) K. At lower molalities the results of Liu and Lindsay [48], Gardner et al [49,50], and Mashovets et al [47] are also plotted. The lines in figure 2 represent osmotic coefficient models developed by Silvester and Pitzer [51], Pitzer et al [40], and Archer [42], all based on PitzerÕs ion-interaction approach.…”

“…The accuracy of pressure measurement itself should not be affected by temperature, since our pressure gauges were kept at ambient temperature. Liu and Lindsay [46] used a precise differential method using bellows and linear [49,50]; n, Mashovets et al [47], only at T = (473.15 and 523.15) K. Equations: --, Archer [42]; -Á-, Pitzer et al [40]; -ÁÁ-, Silvester and Pitzer [51]. position transducers to measure the difference in vapor pressure between pure water and solution.…”

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

“…Moreover, the thermodynamic data are of interest to the oil industry for understanding the problem of Copper Metallic Seal secondary recovery in oil wells. Some work on the thermodynamic properties of electrolyte solutions at elevated temperatures has been reported in the last few years (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)22). In a previous paper (4) we reported the osmotic and activity coefficients of sodium sulphate from 50 to 150°C.…”

Physical properties of the coexisting phases and thermochemical properties of the H₂O component in boiling NaCl solutions

“…Smith (1939) _____________ 60 to 101 0.05 to 1.0 Smith and Hirtle (1939) ______ 61 to 105 1.5 to 4.0 Robinson and Stokes (1959) ____ 15 to 45 0.1 to 6.0 Gardner and others (1963) _____ 125 to 270 1.0 to 3.0 Lindsay and others (1968) _____ 125 to 300 0.1 to 1.0 Gardner (1969) ____________ 140 to 265 0.5 to 1.0 Liu and Lindsay (1971) ______ 75 to 300 3.7 to halite saturation Momicchioli and others (1970) The vapor pressure of the brine at Tx was then calculated from the vapor pressure of H20 liquid at the corresponding temperature To by using equation 6 (modified from Bain, 1964).…”