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Utilization of the post - filtration lye from the soda-chlorine-saltpetre method of soda production

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Drużyński S., Trypuć M., Kiełkowska U., Mazurek K.
Polish Journal of Chemical Technology
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2011
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vol. 13
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issue 4
53-56
EN
The optimal conditions were determined for the precipitation of ammonium metavanadate from the solutions of ammonium nitrate with the use of sodium metavanadate. The experiments were performed with the molar ratio of salts NH4NO3: NaVO3 1.5:1 at temperatures 293, 303, 313 and 323 K. Based on the obtained results, the optimal time of the process was determined as 5 h at 293-303K. Under these conditions, the achieved yield of the precipitation process was ~98.7%, while the contents of the vanadium salts in the post - filtration solution was ~0.02%.
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Plotting of the solubility isotherm for the NH4NO3+ NaVO3+ H2O system

88%
Trypuć M., Drużyński S., Mazurek K.
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EN
The equilibrium research was performed for the NH4NO3 + NaVO3 + NH4VO3 + NaNO3 + H2O system at 293 and 303 K. The location of the P1 and P2 triple points was determined on the equilibrium plots with the planar projection according to Jänecke method. The maximum yield of the conversion of ammonium nitrate(V) to ammonium vanadate(V) was calculated at P1 points. The results constitute the basis to design further equilibrium experiments aimed to precisely determine the lines separating the areas of the co-crystallization of salts in the investigated system on the equilibrium plots in the oblique projection on a plane according to Jänecke method.
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