Phase equilibria for water-methanol mixtures in perfluorosulfonic-acid membranes
A new apparatus was constructed fro precise measurements of water-methanol uptake compositions in a membrane. Uptake concentrations of methanol and water in a Nafion 117 membrane were measured as a function of methanol mole fraction in a liquid-methanol-water mixture for the temperature range 298 to 333 K. Also, uptake concentrations of methanol and water were determined for a second-cycle uptake run. All methanol-water compositions were determined by gas chromatography. The results were quantitatively described by either one of two thermodynamically consistent equations derived from models for the Gibbs energy of the system
Geiger, A. B., Newman, J., & Prausnitz, J. M. (2001). Phase equilibria for water-methanol mixtures in perfluorosulfonic-acid membranes. AICHE Journal, 47(2), 445-452.