Collect. Czech. Chem. Commun. 1980, 45, 1036-1046

An analytical equation derived from a perturbation theory to calculate Henry's constants for square well mixtures

M. I. Guerrero, L. Ponce and J. P. Monfort

Instituto Mexicano del Petróleo, Apartado Postal 14-805, México 14, D. F. Mexico


An analytic form for Henry's constant is derived and applied to several systems. The derivation is based on the use of Leonard-Henderson-Barker perturbation theory for a square well pair potential assuming the Ponce-Renon analytical solution of the square well fluid. Computed values of Henry's constants for CH4-Ar, CH4-N2, CH4-He, CH4-H2, C2H6-N2 and C2H6-CH4 mixtures are compared with experiment. The agreement is quite satisfactory, with mean relative deviations between 2.5 and 8 per cent. Heats of solutions are also computed and compared with experiment.