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Selective and Complete Catalytic Oxidation of Natural Gas in Turbulent Fluidized Beds
Chemical Engineering Dept, Ecole Polytechnique, Montreal, Quebec, Canada
Korean Journal of Chemical Engineering, July 1999, 16(4), 494-500(7), 10.1007/BF02698274
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Abstract
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 NOx 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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Grace JR, Chem. Eng. Sci., 45(8), 1953 (1990)
Horio M, "Hydrodynamics," in Circulating Fluidized Beds, ed. Grace, J.R., Avidan, A.A. and Knowlton, T.M., Blackie Academic & Professional, London 1-21-85 (1997)
Horio M, J. Soc. Powder Technol. Jpn., 23, 20 (1986)
Kehoe PWK, Davidson JF, Instn. Chem. Eng. Symp. Ser., 33, 97 (1971)
Lanneau KP, Trans. IChemE, 38, 125 (1960)
Lee GS, Kim SD, Chem. Eng. Commun., 86, 91 (1989)
Massimilla L, AIChE Symp. Ser., 69, 11 (1973)
Massimilla L, "In Fluidization," 2nd edition Academic Press, New York (1985)
May WG, Chem. Eng. Prog., 55, 49 (1959)
Miwa K, Mori S, Kato T, Muchi I, Chem. Eng., 12, 187 (1972)
Mleczko L, Andorf R, Baerns M, "Prediction of the Performance of a Fluidized Bed Reactor for the Catalytic Oxidative Methane Coupling to C2 Hydrocarbons," AIChE Annual Meeting, Nov.,, 11-16, Chicago (1990)
Mori S, Wen CY, AIChE J., 20, 109 (1975)
Rowe PN, MacGillivray HJ, "Fluidization," Edited by Grace, J.R. and Matsen J.M., New York, 545 (1980)
van Deemter JJ, Chem. Eng. Sci., 3, 143 (1961)
van Swaij VPM, Zuiderweg FJ, Proc. Inter. Symp. on Fluidization and Its Applications. Edited by Cepadues, Toulouse, France, 454 (1973)
van Swaij VPM, ACS Symp. Ser., 72, 193 (1978)
Wen CY, "Chemical Reaction in Fluidized Beds," In Recent Advances in the Engineering Analysis of Chemically Reacting Systems," Edited by Doraisamy, L.K., Wiler Eastern, New Delhi, 256 (1984)
Werther J, Int. Chem. Eng., 20(4), 529 (1980)
Zenz FA, Ind. Eng. Chem., 41, 2801 (1949)
Zhang W, Tung Y, Johnson F, Chem. Eng. Sci., 46, 3045 (1991)
