Excess enthalpies and cross-term second virial coefficients for mixtures containing water vapour

Measurements of the (p, ρ,T) properties and virial coefficients of pure water, methane,n-hexane,n-octane, benzene, and of their aqueous mixtures in the supercritical region

“…Richards et al (14) used excess enthalpy measurements of (water + nitrogen) vapour to derive cross-term second virial coefficients over the temperature range from 373.15 K to 423.15 K. In 1984, Rettich et al (15) measured the solubility of nitrogen in water at pressures from 45 kPa to 115 kPa. These results are used to obtain cross-term second virial coefficients at ten temperatures between 278 K and 323 K. Wormald and Lancaster, (16) using excess enthalpy measurements for (water + n-alkane), derived B 12 values at temperatures between 373.2 K and 423.2 K. Japas and Franck (17) measured the molar volumes of (water + nitrogen) in the supercritical homogeneous region at T = 673 K. From these values, the cross-term second virial coefficients B 12 for (water + nitrogen) at T = 673 K was determined using the extrapolation technique V E m (p 4 0). Second virial coefficient measurements for the pure components have been reviewed.…”

Benzene–polar fluid association. An analysis of measurements of the vapour phase excess molar enthalpy of mixtures of (cyclohexane, or benzene + polar and non-polar fluids)

“…(48) It was of interest to know if the chloromethane-benzene interaction energy was the same as that for water-benzene. If these energies were found to be close, it might be concluded that the dipole-induced dipole effect was largely responsible for the specific interaction between benzene and water or chloromethane.…”

“…Pair potential parameters for water appropriate to a water-nonpolar fluid interaction were obtained from an analysis of H E m measurements on 11 steam mixtures. (48) This was done in a manner similar to the method described above for obtaining second virial coefficients from mixing experiments with nitrogen. Pair potential parameters for each of the 11 fluids mixed with steam were known, a combining rule {equation (17)} was chosen, and an analysis of each of the 11 sets of H E m measurements yielded Stockmayer potential parameters for water.…”

Second virial cross coefficients for (ammonia + water) derived from gas phase excess enthalpy measurements

“…Chloromethane, which has a dipole moment of 6.237 · 10 −30 C · m, is such a molecule, and H E m measurements on (chloromethane + water)(g) and (chloroethane + water)(g) have been reported. (31) Analysis of these and other H E m measurements of mixtures containing water (31) vapour yielded the parameters ε/k = 233 K, σ = 0.312 nm, and t * = 1.238 for B ns 22 for water. These parameters, together with values of ξ calculated from equation (14), make possible the calculation of the second virial cross coefficient for water and any polar or non polar molecule with which no hydrogen bond is formed.…”

“…12 for an interaction of a water molecule with another molecule, polar or non-polar, with which no hydrogen bond is formed. (31) Equations (11) and (14) Cross terms B 12 and φ 12 can be calculated with the usual combining rules:…”