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RISS 인기검색어
- 검색키워드
- 저자 : Jamal Chaouki (검색결과 2 건)
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Selective and Complete Catalytic Oxidation of Natural Gas in Turbulent Fluidized Beds
Klvana, Danilo,Chaouki, Jamal,Guy, Christophe 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.4
Turbulent Fluidized Bed (TFB) reactors appears to be ideal for exothermic and fast reactions such as catalytic oxidation of methane. In this paper, a use of TFB reactor for two catalytic oxidation of methane: catalytic combustion of methane and catalytic selective oxidation of methane for the ethylene synthesis is described. Catalytic fluidized bed combustion of methane is shown to be an emerging technology capable of meeting all environmental constraints as far as nitrogen oxides and carbon monoxide are concerned. This reaction carried out in both the bubbling and the turbulent regimes at 450-500℃ shows that the turbulent regime is more favourable. A self-sustained combustion with complete conversion and a zero emission of NO_x and CO was achieved with a mixture of 4% methane in air at 500℃. The two-phase model of Werther [1990], which phenomenologically introduces the enhancement factor due to chemical reaction, predicts quite well the combustor performance. The same model but without enhancement factor (slower reactions) predicts satisfactorily the experimental data for the oxidative coupling of methane and can be used to quantify the influence of homogeneous and catalytic reactions.
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Production of rare earth oxides from raw ore in fluidized bed reactor
Adrián Carrillo García,Mohammad Latifi,Said Samih,Jamal Chaouki 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-
This study deals with the calcination of a rare earth bearing ore to produce rare earth oxides in afluidizedbed reactor, with the aim of demonstrating the advantage of calcining bigger particles to decomposestable minerals such as monazite by its mineral association within a particle. Rare earth oxides wereproduced by the decomposition of its bearing minerals, bastnäsite and monazite along with the gangues. During the calcination, bastnäsite decomposed at relatively low temperature while monazite reacted CaOat high temperature. The formation of cracks, revealed by BET and SEM analysis, allowed the particle’sdegassing while the size remained constant, thus describing a crackling core behavior. The association of monazite to calcite for bigger particles ( 60 mesh) allowed its decomposition toproduce rare earth oxides with a monazite conversion of 50 %. Also, an extraction process comprised ofcalcination and mild acid leaching enriched the rare earth oxides in the ore by 3.34 and improvedleaching efficiency of the gangues compared to smaller size (enrichment ration of 2.35). Using biggerparticle sizes in the upstream process of a mining industry, i.e. comminution, can also reduce the energyconsumption.
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