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Received September 9, 2007
Accepted October 18, 2007
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Determination of yield distribution in olefin production by thermal cracking of atmospheric gasoil
Chemical Engineering Department, Faculty of Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran
sorood.zahedi@gmail.com
Korean Journal of Chemical Engineering, July 2008, 25(4), 681-692(12), 10.1007/s11814-008-0112-4
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Abstract
A pilot plant was designed and set up to study the thermal cracking of atmospheric gasoil. Based on the CCD (central composite design) method, a set of systematic experiments were designed and carried out. The designed variables were COT (coil outlet temperature), steam ratio and feed flow rate. The ranges of these variables were, respectively, equal to 716-884 oC, 0.46-1.136 and 0.977-6.02 g/min. The obtained minimum and maximum yield of ethylene was, respectively, equal to 1.7% and 30.9%, as well as the maximum yield of propylene was 12.2%. To predict the yield distribution of products and the coke formation in the range of operating conditions, a mechanistic model was developed based on experimental results. To analyze and characterize the atmospheric gasoil, a novel algorithm was applied. This algorithm utilized density, ASTM distillation curve, H/C ratio and the total aromatic fraction and generates the detail analysis of feedstock including paraffinic, naphthenic, aromatics and poly aromatic compounds.
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Zdonik SB, Hayward GL, Fishtine SH, Hydrocarb. Process., December (1975)
Kaiser V, Gilbourne D, Pocini CA, Hydrocarb. Process., April (1977)
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Depeyre D, Flicoteaus C, Arabzadeh F, Zabaniotou A, Ind. Eng. Chem. Res., 28(7) (1989)
Clymans PJ, Froment GF, Berthelin M, Trambouze P, AIChE J., 30(6), 904 (1988)
Ranzi E, Faravelli T, Gaffuri P, Garavaglia E, Goldaniga A, Ind. Eng. Chem. Res., 36(8), 3336 (1997)
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Taskar U, Riggs JB, AIChE J., 43(3), 740 (1997)
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Riazi MR, Daubert TE, Hydrocarbon processing, 115 (1980)
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Sundaram KM, Froment GF, Chem. Eng. Sci., 32, 601 (1977)
Zou R, Fundamentals of pyrolysis in petrochemistry and technology, Lewis Pub (1993)
Box GEP, Draper NR, Empirical model-building and response surfaces, John Wiley & Sons (1987)
Gerold CF, Wheatley PO, Applied numerical analysis, Addison-Wesley publishing company (1984)
