Chlorination of V2O5 by CCl4. Adsorption and steady state reaction

Mink, G.; Bertóti, I.; Szèkely, T.

doi:10.1007/bf02064456

Cited by 10 publications

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“…The partial pressure of the reactive gases was 11.2 kPa for CC14 [6], and 10.1 kPa for COC12 or C12. Some characteristic conversion (relative mass loss) vs. time curves are shown in Figs 4 and 5.…”

Section: Kinetic Resultsmentioning

confidence: 99%

“…The reaction kinetics was followed by isothermal TG measurements in the temperature ranges 455-540 [6], 400-500 and 770-900 K for CC14, COCI 2 and C12, respectively. The partial pressure of the reactive gases was 11.2 kPa for CC14 [6], and 10.1 kPa for COC12 or C12.…”

Section: Kinetic Resultsmentioning

confidence: 99%

“…CC14 ofpss, purity [6], phosgene and chlorine of 3N purity were used as chlorinating agents. Nitrogen of 4N purity, dried in the usual manner, was used as carrier gas.…”

Section: Methodsmentioning

confidence: 99%

“…In these reactions, however, the predominant volatile product is VOC1 a, which is not suitable for the direct production of metallic vanadium. In spite of the great practical and theoretical importance of these types of chlorination, hardly any data are available concerning the kinetics and mechanisms of these reactions [2][3][4].In our previous work [5][6][7], kinetic studies were made on the V205 + CC! 4 reaction.…”

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confidence: 99%

“…The aim of the present work is to give comparative data on the thermodynamics and kinetics of the V20 5 + el2, g20 5 + COCl 2 and V20 5 + CC14 reactions. All the kinetic data referring to this latter process are taken directly or are derived from the results published in [6]. …”

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confidence: 99%

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Comparative kinetic and thermodynamic study on the chlorination of V2O5 with CCl4, COCl2 and Cl2

Pap

Mink

Bertóti

et al. 1989

Journal of Thermal Analysis

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The chlorination kinetics of pure vanadia was studied via isothermal thermogravimetric measurements, with CCI4, COC12 and (212 as chlorinating agents. At temperatures where chemical control was predominant, apparent activation energies of 77, 48 and 126 kJ'. mo1-1 were obtained for chlorination by CC14, COC14 and C12, respectively. For interpretation of the conversion vs. time curves in the whole conversion range, a non-unifoml particle size distribution was assumed, where the reacting solid phase was considered to be composed of thin plates of different thicknesses. With this model, a fairly good correspondence was obtained between the measured and calculated kinetic cm'ves. Selected thermodynamic calculation data on the V205 + CC14, V205 + COC12 and V205 + C12 systems are presented.On an industrial scale, vanadium is extracted in the form of pure, volatile VCI 4 from concentrated ores and minerals by high-temperature chlorination with C12 in the presence of carbon [1]. The direct action of gas-phase chlorinating agents such as CC14, COC14, CO + Cl2, etc. offers a considerable reduction of the reaction temperature. In these reactions, however, the predominant volatile product is VOC1 a, which is not suitable for the direct production of metallic vanadium. In spite of the great practical and theoretical importance of these types of chlorination, hardly any data are available concerning the kinetics and mechanisms of these reactions [2][3][4].In our previous work [5][6][7], kinetic studies were made on the V205 + CC! 4 reaction. The aim of the present work is to give comparative data on the thermodynamics and kinetics of the V20 5 + el2, g20 5 + COCl 2 and V20 5 + CC14 reactions. All the kinetic data referring to this latter process are taken directly or are derived from the results published in [6].

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Section: Kinetic Resultsmentioning

confidence: 99%

Section: Kinetic Resultsmentioning

confidence: 99%

“…CC14 ofpss, purity [6], phosgene and chlorine of 3N purity were used as chlorinating agents. Nitrogen of 4N purity, dried in the usual manner, was used as carrier gas.…”

Section: Methodsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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