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1
Content available The influence of sulfur addition on the hazard-type reaction of ilmenite ores with sulfuric acid
Jabłoński Maciej, Lubkowski Krzysztof, Tylutka Sandra, Ściążko Andrzej
Polish Journal of Chemical Technology
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2021
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Vol. 23, nr 3
17--23
EN
The paper presents results of thermokinetic investigation of the hazard-type reaction of Norwegian and Australian ilmenite ores with sulfuric acid, modified by the addition of elemental sulfur, to increase the process safety in industrial conditions. In the reactions of both ilmenite ores the addition of sulfur caused a reduction of the thermal power generated in the reaction and a decrease in the value of the thermokinetic parameter ΔTmax/Δτ for almost the whole range of initial concentrations of sulfuric acid. It was also found that the addition of sulfur to the reaction did not negatively affect the degree of ilmenite leaching. The interpretation of the obtained thermokinetic curves allowed to determine safe process conditions for both types of titanium raw materials.
2
Content available Heat effects in the reaction of sulfuric acid with ilmenites influenced by initial temperature and acid concentration
Jabłoński Maciej, Lubkowski Krzysztof, Tylutka Sandra, Ściążko Andrzej
Polish Journal of Chemical Technology
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2021
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Vol. 23, nr 3
37--42
EN
The influence of temperature and sulfuric acid concentration on the enthalpy and the rate of heat release during the reaction of Norwegian and Australian ilmenites with sulfuric acid was determined. The experimental results obtained from calorimetric measurements were compared with theoretical calculations based on the oxide composition and the phase composition of the raw material. Experimentally determined heat of reaction for Norwegian ilmenite (900–940 kJ/kg) and Australian ilmenite (800–840 kJ/kg) showed good agreement with theoretical calculations based on the phase composition of the raw material. It was found that the enthalpy of ilmenites decomposition reaction does not depend on the concentration of sulfuric acid in the concentration range from 83% to 93%. It was also demonstrated that the temperature and concentration of sulfuric acid have a significant impact on the thermokinetics of the decomposition process, increasing the value of the average rate of temperature change.
3
Content available remote Wpływ potencjalnych źródeł ciepła na proces zabezpieczania pomieszczeń gazami gaśniczymi
Jabłoński Maciej, Boroń Sylwia
Materiały Budowlane
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2020
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nr 7
5--8
PL
W artykule przeprowadzono analizę wpływu potencjalnych źródeł ciepła występujących w pomieszczeniu, zabezpieczanym stałym urządzeniem gaśniczym gazowym, na rozkład stężenia gazu gaśniczego, a tym samym na skuteczność gaśniczą systemu. W badaniach wykorzystano komorę badawczą wyposażoną w stałe urządzenie gaśnicze na dwutlenek węgla oraz aparaturę umożliwiającą dokonywanie pomiarów zmian stężenia gazu gaśniczego w czasie. Badania zostały wykonane w trzech wariantach: przy braku obecności źródeł ciepła; z uwzględnieniem pożaru oraz z uwzględnieniem pożaru i stałego źródła ciepła, w postaci elektrycznej płyty grzewczej, umieszczonego w komorze badawczej. Na podstawie przeprowadzonych analiz stwierdzono znikomy wpływ źródeł ciepła na rozkład stężenia gazu gaśniczego w zaproponowanym układzie przestrzeni chronionej.
EN
This article undertakes to conduct an experimental analysis of the impact of potential heat sources occurring in the room protected by FES-gaseous on the distribution of extinguishing gas concentrations, and thus on the extinguishing efficiency of the system. The research used a test chamber equipped with a fixed gaseous extinguishing system on carbon dioxide and apparatus enabling measurements of changes of extinguishing gasconcentration over time. The tests were carried out in three variants: in the absence of heat sources, with the presence of fire and taking into account the fire and a constant heat source in the form of an electric hobin the test chamber. Based on the analyzes carried out, a slight impact of the heat sources on the distribution of extinguishing gas concentrations in the proposed arrangement of protected space was found.
4
Content available Enthalpy of isopropanol adsorption on zeolite
Jabłoński Maciej, Dzienisz Alicja, Sawicka Marta, Wróblewska Elwira, Lubkowski Krzysztof, Dąbrowska Grażyna, Piz Mateusz, Sreńscek-Nazzal Joanna
Polish Journal of Chemical Technology
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2019
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Vol. 21, nr 4
58--65
EN
The enthalpy of isopropanol adsorption on ZSM-5 (Zeolite Socony Mobil Framework Type MFI) was determined by the static adsorption method at the temperature range from 20°C to 100°C. Langmuir and Huttig models of equilibrium adsorption have been used to calculate the enthalpy of isopropanol adsorption at these conditions. Adsorption isotherms determined by the flow method at 20°C and 30°C have been also used in the calculations. The obtained values of isopropanol adsorption enthalpy were compared with the values of isopropanol evaporation enthalpy and with the results obtained from isopropanol and water desorption measurements with thermogravimetry and differential scanning calorimetry methods.
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