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1
Content available Vanadium pentoxide application for the synthesis of NaVO3 in the presence of oxygen
Białowicz K., Trypuć M., Mazurek K., Kiełkowska U.
Polish Journal of Chemical Technology
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2008
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Vol. 10, nr 4
4-6
EN
Investigation was carried out on the optimal conditions of the synthesis of NaVO3 and Cl2 from NaCl and V2O5 in the presence of the atmospheric oxygen. The influence of the excess of NaCl relative to V2O5 was investigated. Also the effect of the quartz sand introduced into the reaction mixture on the yield of the NaVO3 synthesis was determined. The obtained product of synthesis was isolated from the post-reaction mixture.
2
Content available Utilization of the post-filtration lye from the SCS method of soda production
Trypuć M., Drużyński S., Kiełkowska U., Mazurek K.
Polish Journal of Chemical Technology
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2007
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Vol. 9, nr 4
59-62
EN
The mutual solubility of salts in the NaVO3-NaNO3-H2O system was investigated at 293 - 323 K temperature range by the method of isothermal saturation of solutions. A fragment of the solubility polytherm for that system was plotted, based on the obtained data. The investigated system is a part of the quaternary NH4NO3-NaVO3-NH4VO3-NaNO3 system, and it is necessary for plotting the solubility isotherm as a planar projection according to Janecke, since it defines one edge of its square. Knowledge of the isotherm for that quaternary system is necessary to determine the optimal utilization conditions for the post-filtration lye, formed during the soda production from NaNO3 by the Solvay method, using NaVO3.
3
Content available remote Minimizing the losses of toxic vanadium compounds in the vanadium method by urea application
Trypuć M., Mazurek K., Białowicz K., Kiełkowska U.
Polish Journal of Chemical Technology
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2004
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Vol. 6, nr 2
56-58
EN
The solubility in the systems: NaVO3 + CO(NH2)2 + H2O and KVO3 + CO(NH2)2 + H2O at the temperature 293 K and 313 K was measured employing the isothermal solution method. These results are used to plot part of the polythermal solubility surface for the investigated systems. Compound formation did not occur. The results will be helpful in making conclusions concerning the use of urea to minimize the losses of toxic vanadium compounds.
4
Content available remote Solubility investigations in the NaVO3 + NH4HCO3 + NH4VO3 + NaHCO3 + H2O system
Trypuć M., Kiełkowska U.
Polish Journal of Chemical Technology
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1999
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Vol. 1, nr 1
40-44
EN
Mutual salts solubility in the NaVO3 + NH4HCO3 + NH4VO3 + NaHCO3 + H2O system at temperature 303 K and the carbonization degree (R) of 90% has been studied. On the basis of the compiled data, a solubility polytherm section in the oblique projection on plane according to Janecke has been plotted. It has been found out that ammonium metavanadate is a sparingly soluble salt, NH4VO3 and NaHCO3 compose the stable pair of salts, whereas the triple points P1, P2 are represented by solutions convergently saturated. A thorough knowledge of the solubility isotherm course for the reciprocal salt pairs system is essential for an elaboration of sodium carbonate production technology based on NaVO3 as an initial reactant.
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