Vapour pressures of ammonia and carbon dioxide in equilibrium with aqueous solutions. Part VI

Badger, E. H. M.; Wilson, D Shafer

doi:10.1002/jctb.5000660305

Cited by 9 publications

References 1 publication

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Thermodynamics of aqueous solutions containing volatile weak electrolytes

1975

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A thermodynamic framework has been established to calculate equilibrium vapor‐liquid compositions for dilute aqueous solutions of one or more volatile weak electrolytes: ammonia, carbon dioxide, hydrogen sulfide, sulfur dioxide, and hydrogen cyanide, in the temperature range 0° to 100°C and for liquid‐phase concentrations from 10−4 to 1 or 2 molal. Binary electrolyte‐water parameters are obtained from reduction of experimental data for single‐solute solutions. Additional parameters required for multi‐solute systems are estimated from correlations. These parameters, coupled with chemical equilibria, are used to predict multicomponent vapor‐liquid equilibria. At a fixed temperature, either liquid‐phase or vapor‐phase compositions may be calculated if the composition of the other phase is known. Although the framework has no adjustable parameters for multisolute systems, predicted and observed equilibria are in good agreement for two ternary systems: ammonia‐hydrogen sulfide‐water and ammonia‐carbon dioxide‐water.

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Thermodynamics of aqueous solutions containing volatile weak electrolytes

1975

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Composition and vapour pressures of aqueous solutions of ammmonia, carbon dioxide and hydrogen sulphide

Krevelen¹,

Hoftijzer²,

Huntjens³

1949

Recl. Trav. Chim. Pays‐Bas

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Vapour pressures of aqueous solutions containing ammonia and carbon dioxide, ammonia and hydrogen sulphide or ammonia, carbon dioxide and hydrogen sulphide, have been determined at temperatures from 20‐60° C. Dissolved hydrogen sulphide is present almost completely in the form of ammonium hydrosulphide. Dissolved carbon dioxide is present in the form of carbonate, bicarbonate and carbamate of ammonium. The experimental vapour pressure data are interpreted from the viewpoint of the ionic equilibria in the solutions. The numerical values of the equilibrium constants have been derived. A method is described enabling one to calculate the vapour pressure for arbitrary compositions of the solutions. Diagrams are given for the vapour pressures of the two‐component system ammonia‐carbon dioxide, as a function of the total ammonia content and the ratio R (= total carbon dioxide/total ammonia). From these diagrams also the vapour pressures of the three‐component system ammonia‐carbon dioxide‐hydrogen sulphide can be derived approximatively.

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