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Vapor‐liquid equilibria in multicomponent aqueous solutions of volatile weak electrolytes
Author(s) -
Edwards T. J.,
Maurer Gerd,
Newman John,
Prausnitz J. M.
Publication year - 1978
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.690240605
Subject(s) - molality , chemistry , aqueous solution , ternary operation , electrolyte , hydrogen sulfide , inorganic chemistry , carbon dioxide , ionic liquid , thermodynamics , ammonia , activity coefficient , sulfur , organic chemistry , catalysis , physics , electrode , computer science , programming language
A molecular‐thermodynamic correlation is established for calculating vapor‐liquid equilibria in aqueous solutions containing one or more volatile electrolytes: ammonia, carbon dioxide, hydrogen sulfide, sulfur dioxide, and hydrogen cyanide. The correlation is similar to that presented in 1975, but the domain of application has been increased. The present correlation holds from about 0° to 170°C and for ionic strengths of about 6 molal; for the weak electrolytes considered here, this corresponds to total concentrations between 10 and 20 molal. To represent activities at these high concentrations, activity coefficients are expressed as a function of molality by Pitzer's equation. Required parameters are estimated from data reduction or from correlations. Special attention is given to the ternary systems ammonia‐carbon dioxide‐water and ammonia‐hydrogen sulfide‐water. Calculated equilibria are in satisfactory agreement with the severely limited experimental data now available.