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1
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The influence of urea on the K2CO3and NH4VO3solubility in the K2CO3+ NH4VO3+ H2O system

100%
Kiełkowska U.
Polish Journal of Chemical Technology
|
2008
|
vol. 10
|
issue 4
25-27
EN
The influence of urea on the vanadium(V) and potassium ion concentrations in the K2CO3 + NH4VO3 + H2O system was determined in the temperature range of 293 K to 313 K. Additionally, the solution density dependence versus the urea concentration was presented. These data are essential for the assessment of optimum operating conditions for the new production process of potassium carbonate.
2
Content available remote

Precipitation of Calcium Carbonate in the Presence of Urea at 293 K and 343 K

64%
Białowicz K., Kiełkowska U.
Polish Journal of Chemical Technology
|
2014
|
vol. 16
|
issue 2
95-98
EN
The results of the precipitation of calcium carbonate from a waste post-distillation liquid (DS) and a sodium bicarbonate saturated solution – both from the Solvay method – in the presence of urea are presented. The investigation was carried out at 293 K and 343 K. Reagent dosage times of 1, 5, 10, 20 and 30 min, and urea concentrations of 5, 6 and 10 mol/dm3 were applied. The granulometric composition, the values of bulk and packing densities and the absorptiveness sorption of water and paraffin oil from the obtained calcium carbonate were investigated.
3
Content available remote

Utilization of used contact masses from the oxidation state of sulfur(IV) oxide to sulfur(VI) oxide

51%
Trypuć M., Mazurek K., Kiełkowska U., Drużyński S.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 3
26-28
EN
The research was conducted to determine the influence of the urea concentration in the leaching solutions on the efficiency of recovery of vanadium and iron compounds from the used vanadium catalyst from the node of oxidation of sulfur dioxide to sulfur trioxide.
4
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Leaching of vanadium(V) from the mixture after potassium metavanadate synthesis based on KCl and spent vanadium catalyst

51%
Kiełkowska U., Białowicz K., Drużyński S.
Polish Journal of Chemical Technology
|
2013
|
vol. 15
|
issue 4
33-35
EN
The results of the leaching of vanadium(V) from the mixture after potassium metavanadate synthesis from KCl and spent vanadium catalyst in the presence of steam were presented. Spent vanadium catalyst was obtained from the waste storage of a chemical plant producing sulfuric acid(VI) by the contact method. The reaction mixture was leached using different solutions: 1 M Na2CO3, 20% CO(NH2)2, 15% NaOH, 15% KOH, 2 M H2SO4. The effect of time and temperature was studied. The results showed that for reaction mixture leached for 4 h at 303 K in the presence of 15% sodium hydroxide solution at a liquid:solid ratio of 10:1, the extent of leaching of vanadium(V) was 95.43%.
5
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The Influence of Urea on the KHCO3and NH4VO3Solubility in the KHCO3+ NH4VO3+ H2O System

51%
Kiełkowska U., Trypuć M., Mazurek K., Drużyński S.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 2
23-26
EN
The influence of urea on the vanadium(V) and potassium ion concentrations in the KHCO3 + NH4VO3 + H2O system was determined in the temperature range of 293 K to 303 K. Additionally, the solution density dependence versus the urea concentration was presented. These data are essential for the assessment of optimum operating conditions for the new production process of potassium carbonate.
6
Content available remote

Utilization of the post-filtration lye from the SCS method of soda production

51%
TrypuĆ M., Drużyński S., Kiełkowska U., Mazurek K.
Polish Journal of Chemical Technology
|
2007
|
vol. 9
|
issue 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.
7
Content available remote

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

51%
Drużyński S., Trypuć M., Kiełkowska U., Mazurek K.
Polish Journal of Chemical Technology
|
2011
|
vol. 13
|
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%.
8
Content available remote

Vanadium pentoxide application for the synthesis of NaVO3in the presence of oxygen

51%
Białowicz K., Trypuć M., Mazurek K., Kiełkowska U.
Polish Journal of Chemical Technology
|
2008
|
vol. 10
|
issue 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.
9
Content available remote

Precipitation of calcium carbonate in the presence of urea at 293K

51%
Białowicz K., Kiełkowska U., Trypuć M.
Polish Journal of Chemical Technology
|
2008
|
vol. 10
|
issue 4
7-10
EN
The results of the precipitation of calcium carbonate from waste distillation liquor (DS) from the Solvay method and sodium bicarbonate saturated solution in the presence of urea were presented. The investigation was carried out at 293K. The influence of the time of reagents dosage to the solution of urea on the physicochemical character of obtaining product was studied. The time of reagents dosage: 1, 5, 10, 20, 30 min and the concentration of the urea applied: 0.5, 1, 2 and 4 mol/dm3. The granulometric composition, the values of bulk and packing densities and the absorptiveness sorption of water and paraffin oil of the obtaining calcium carbonate were investigated.
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