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Phase equilibria for water–methanol mixtures in perfluorosulfonic‐acid membranes
Author(s) -
Geiger Arne B.,
Newman John,
Prausnitz John M.
Publication year - 2001
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690470221
Subject(s) - methanol , mole fraction , chemistry , gibbs free energy , membrane , phase (matter) , nafion , chromatography , analytical chemistry (journal) , fraction (chemistry) , thermodynamics , organic chemistry , biochemistry , physics , electrode , electrochemistry
Abstract A new apparatus was constructed for precise measurements of water–methanol up‐take 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.

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