Vapor-liquid equilibria for single weak electrolyte aqueous solutions in dilute regions

Abstract

Vapor-liquid equilibria (VLE) for single electrolyte systems NH3-H20, HC00H-H20, CH3C00H-H20 and C2H5C00H-H20 were measured at 101.3 kPa in dilute electrolyte regions. The experimental data were compared with the results calculated by the Wilson equation or the Margules equation which were extended to the whole concentration range of weak electrolyte, and good agreement was found for the present systems. Further, the effect of pH on VLE was measured for NH3-H20 and CH3C00H-H20 systems at 101.3 kPa and the pH effect was predicted by using the Wilson equation mentioned above. Agreement between calculated and experimental results was very good. © 1985, The Society of Chemical Engineers, Japan. All rights reserved.