Phase diagram for the system KVO3 + NH4HCO3 + NH4VO3 + KHCO3 + H2O at 303 K |
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Authors: | Mieczys aw Trypu ,Urszula Kie kowska |
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Affiliation: | Faculty of Chemistry, Nicolaus Copernicus University, 7 Gagarin Street, 87-100 Toruń, Poland |
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Abstract: | Solubility data of the KVO3 + NH4HCO3 + NH4VO3 + KHCO3 + H2O system at 303 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. |
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Keywords: | Solubility Phase diagram KVO3 NH4HCO3 NH4VO3 KHCO3 H2O |
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