Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9626016 | Fluid Phase Equilibria | 2005 | 6 Pages |
Abstract
Solubility data of the KVO3Â +Â NH4HCO3Â +Â NH4VO3Â +Â KHCO3Â +Â H2O system at 303Â K were determined under varying pressure conditions. The results were used to construct a phase diagram in the oblique projection according to Jänecke's method. At constant p and T this diagram includes two invariant points, five double saturated liquid curves, and four crystallization fields corresponding to KVO3, NH4HCO3, NH4VO3, and KHCO3. It has been found that ammonium meta-vanadate is a sparingly soluble salt. NH4VO3 and KHCO3 compose the stable pair of salts, whereas KVO3 and NH4HCO3 form the unstable salt-pair. A thorough knowledge of the solubility phase diagram for this reciprocal quaternary salt system is the theoretical basis of the carbonation process of the potassium meta-vanadate saturated ammonia solution.
Keywords
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Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
MieczysÅaw TrypuÄ, Urszula KieÅkowska,