Abstract
Solubility data of the KVO 3 + NH 4HCO 3 + NH 4VO 3 + KHCO 3 + H 2O 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 KVO 3, NH 4HCO 3, NH 4VO 3, and KHCO 3. It has been found that ammonium meta-vanadate is a sparingly soluble salt. NH 4VO 3 and KHCO 3 compose the stable pair of salts, whereas KVO 3 and NH 4HCO 3 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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