HENRY LAW CONSTANTS AND DISTRIBUTION COEFFICIENTS OF SULFUR-HEXAFLUORIDE IN WATER FROM 25-DEGREES-C TO 230 DEGREES-C

The solubility of SF6 in water has been measured between 75 degrees C and 230 degrees C by direct sampling of SF6-saturated water contained in a stainless steel autoclave. The solubility (reported as a distribu tion coefficient) ranges from ln B = 13.93 at 75 degrees C to ln B = 8 .34 at 230 degrees C. The experimental data were combined with low-tem perature data from the literature to obtain an empirical equation for the Henry's law coefficient over the temperature interval 25 degrees C to 230 degrees C. At temperatures above about 210 degrees C an unexpe ctedly rapid decrease in SF6 gas partial pressure occurred, and above this temperature deviation from Henry's law also was observed.