CORRELATION OF AQUEOUS HENRYS CONSTANTS FROM O-DEGREES-C TO THE CRITICAL-POINT

Recent theoretical results (Japas and Levelt Sengers, 1989) for the temperature dependence of Henry's constant near the solvent's critical point are used to obtain a linear expression which, for aqueous solutions of nonpolar gases, fits experimental Henry's constant data at temperatures from water's critical point down to roughly the normal boiling point. A small correction with only one additional adjustable parameter extends the correlation to 0°C. The final result is a three‐parameter correlation, covering the entire range of temperatures, which fits the available data as well as or better than existing four‐parameter empirical expressions and better than a recently proposed three‐parameter expression. Since the correct near‐critical behavior is built in, the new correlation should be especially useful for estimating Henry's constants in systems where little or no data exist at high temperatures. Fitted parameters are given for ten nonpolar gases in H2O and six nonpolar gases in D2O. Copyright © 1990 American Institute of Chemical Engineers