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1

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

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

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

Badanie warunków strącania NH4VO3 z ługu pofiltracyjnego metody Solvay'a

Trypuć M., Łyjak G., Kiełkowska U.

Prace Naukowe Politechniki Szczecińskiej. Instytut Technologii Nieorganicznej

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1998

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Nr 547

173-176

PL

Strącanie metawanadanu amonu jest jednym z etapów nowej bezodpadowej metody częściowej utylizacji ługu pofiltracyjnego powstającego podczas produkcji sody metodą Solvay'a. Jednym z założeń tej metody jest wyeliminowanie oddziału regeneracji amoniaku, który jest głównym źródłem odpadów płynnych. Przedmiotem badań było określenie optymalnych warunków prowadzenia reakcji strącania metawanadanu amonu z ługu pofiltracyjnego pozostającego po odsączeniu kryształów wodorowęglanu sodu. Badania prowadzono w zakresie 293-303 K stosując jako reagent strącający stały NaVO3, zarówno dla roztworów zawierających jedynie NH4Cl jak i dla roztworów z dodatkiem różnych ilości NaCl.

EN

Ammonium metavanadate precipitation step is an important element of the newly described method of the partial utilization of the end-liquor generated in traditional Solvay's method. This modified method eliminates the ammonia regeneration step in order to avoid the useless source of fluid wastes. This studies have been carried out to describe the optimum conditions for running the precipitation of ammonium metavanadate within temperature range of 293-303 K. Solid NaVO3 has been applied as an active precipitant for both solutions containing only NH4Cl and different quantities of NaCl.