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Rigorous model for ion exchange equilibria of strong and weak electrolytes
Author(s) -
Jansen Marcel L.,
Straathof Adrie J. J.,
van der Wielen Luuk A. M.,
Luyben Karel Ch. A. M.,
van den Tweel Will J. J.
Publication year - 1996
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.690420712
Subject(s) - electrolyte , counterion , weak base , chemistry , strong electrolyte , activity coefficient , thermodynamics , ion , stoichiometry , ion exchange , base (topology) , inorganic chemistry , electrode , aqueous solution , organic chemistry , physics , mathematical analysis , mathematics
A thermodynamics‐based equilibrium model was developed to describe ion exchange equilibria of strong and weak electrolytes. It is applicable to binary and multicomponent systems, using selectivity coefficients for all ion pairs and distribution coefficients for all neutral species as parameters. The model was successfully tested for a strong‐base anion exchange resin with the strong electrolyte NaCl and the weak electrolytes acetic acid and N‐acetylmethionine in a wide concentration range. Compared to conventional models, this model is more advantageous because it takes into account the uptake of all species, counterions as well coions and neutral species, thus making it possible to calculate the intraparticle pH. Especially when weak electrolytes are involved and when electrolyte concentrations strongly exceed the resin capacity, it is superior to conventional ones, whereas for dilute systems it converges to the conventional stoichiometric displacement model.