No abstract

LBL-22265The

A static experimental apparatus has been used to measure vapor-liquid equilibria for aqueous systems containing ammonia and carbon dioxide. Both phases were sampled and analyzed using gas-liquid chromatography. For aqueous mixtures of ammonia-potassium nitrate and ammonia-potassium sulfate, measurements were made at 100 and 150 °C to examine the effects of salts at elevated temperatures. Some data are also given for the NH3/C02/H20 system at 100 and 150 °C. These and other recent experimental data were used to update the computerized molecular-thermodynamic correlation of Edwards et al. for sour-water phase equilibria, as required for water-pollution abatement.

Ind. Eng. Chem. Fundam. 1983, 22, 86-90 fZi = molar enthalpy of a pure component i Hi = partial molar enthalpy of component i l i , = latent heat of pure component i at temperature Ti L = azeotropic (integral) latent heat of vaporization, or integral latent heat of vaporization of a non-azeotropic mixture in eq 19 and 22 P = total pressure P, = reduced pressure defined by PIPc P, = critical pressure of the mixture R = universal gas constant T = absolute temperature Ti = boiling temperature of a pure component T, = reduced temperature defined by T f T, T,, Tci, Tcp = true critical temperature of a mixture; critical temperature of component i; pseudocritical temperature given by eq 16 y, = dew point or bubble point of a mixture, respectively V, = partial volume of component i Vci = critical volume of component i Xi = mole fraction of component i in the liquid AHi = partial heat of mixing of component i AH = heat of mixing Greek Letters a, p, y, 6 = adjustable parameters w, wi = acentric factor of the mixture defined by eq 11; acentric Superscripts 1 = of the liquid factor of component i v = of the vapor * = of an azeotropic mixture Subscripts i = of pure component i iTi = of component i at a temperature Ti obsd = observed P, T = at a constant pressure or temperature, respectively P, T1 = at temperature F or T', respectively Literature Cited Gmehling, J.; Onken, V.; A&, W. "Vapor-Liquid Equilibrium Data Collection",A simple technique is suggested for estimating salting-out constants for nonpolar gases in aqueous salt solutions in the range 0 to 60 O C . As suggested by the perturbation theory of Tiepel and Gubbins (1973), the salting-out constant is given by a linear function of the Lennardlones energy parameter of the gas. Data for nine nonpolar gases were examined. Correlation parameters are given for nine nonpolar gases and fifteen salts at 25 O C . Correlation parameters are also reported for individual ions. For a few salts, correlation parameters are given as a function of temperature.A technique for the prediction of the thermal conductivity of nonpolar pure fluids and mixtures over the entire range of PVT states is presented. The model is analogous to the extended corresponding states viscosity model reported previously by Ely and Hanley in 1981. Calculations for the thermal conductivity require only critical constants, molecular weight, Pitzer's acentric factor, and the ideal gas heat capacity as a function of temperature for each mixture component as input. Extensive comparisons with experimental data for pure fluids and nonpolar binary fluid mixtures including paraffins, alkenes, aromatics, and naphthenes with molecular weights to that of C24 are presented. The average absolute deviation between experiment and prediction is less than 7 % for both pure species and mixtures.