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Dynamic Modeling and Simulation of Heavy Paraffin Dehydrogenation Reactor for Selective Olefin Production in Linear Alkyl Benzene Production Plant

Authors: G. Zahedi, H. Yaghoobi


Modeling of a heterogeneous industrial fixed bed reactor for selective dehydrogenation of heavy paraffin with Pt-Sn- Al2O3 catalyst has been the subject of current study. By applying mass balance, momentum balance for appropriate element of reactor and using pressure drop, rate and deactivation equations, a detailed model of the reactor has been obtained. Mass balance equations have been written for five different components. In order to estimate reactor production by the passage of time, the reactor model which is a set of partial differential equations, ordinary differential equations and algebraic equations has been solved numerically. Paraffins, olefins, dienes, aromatics and hydrogen mole percent as a function of time and reactor radius have been found by numerical solution of the model. Results of model have been compared with industrial reactor data at different operation times. The comparison successfully confirms validity of proposed model.

Keywords: Dehydrogenation, fixed bed reactor, modeling, linear alkyl benzene.

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[1] M.M. Bhasin, J.H. McCain, B.V. Vora, T. Imai, P.R. Pujad'o, "Dehydrogenation and oxydehydrogenation of paraffins to olefins", Applied Catalysis A: General 221 (2001) 397-419.
[2] Z. Mansourpour, S. Sahebdelfar, M. Saeedizad, "Study of Pt-Sn/Al2O3 Catalyst Deactivation Kinetic in Dehydrogenation of Normal Paraffin", National Petrochemical Company, Research & Technology, Tehran, Iran, 2006.
[3] G. Padmavathi, K.K. Chaudhuri, D. Rajeshwer, G. Sreenivasa Rao, K.R. Krishnamurthyb, P.C. Trivedic, K.K. Hathic, N. Subramanyamc" Kinetics of n-dodecane dehydrogenation on promoted platinum catalyst", Chemical Engineering Science 60 (2005) 4119 - 4129.
[4] Bistoon petrochemical complex, IFP manual, 2005.
[5] P. Ciambelli, A. Di Benedetto, R. Pirone, G. Russo, "Spontaneous isothermal oscillations in N2O catalytic decomposition: fixed-bed reactor modeling", Chemical Engineering Science 54 (1999) 4521- 4527.
[6] M. Mohagheghi, Gh. Bakeri, M. Saeedizad, "Study of External and Internal Diffusion Effects on Propane Dehydrogenation Reaction over Pt-Sn/Al2O3 Catalyst", National Petrochemical Company, Research & Technology, Tehran, Iran, 2006.
[7] R. B. Bird, W. E. Stewart, E. N. Lightfoot, "Transport Phenomena", John Wily Press, Second Edition, New York, 2002.
[8] McDonald, Stuart "Finite Difference Approximation for Linear Stochastic Partial Differential Equations with Method of Lines", Social and Information Systems Laboratory, California Institute of Technology, 2006.
[9] Bistoon petrochemical complex longsheet, 2006-2007.
[10] R. E. Treybal, "Mass Transfer Operation", Third Edition,
[11] J .M. Prausnitz, R. N. Lichtenthaler, E. G. de Azevedo, "Molecular Thermodynamics of Fluid-Phase Equilibria", Second Edition,
[12] A. Kharrab, R. B. Gaunter, "Numerical Analysis with MATLAB",
[13] O. Levenspiel, "Chemical Reaction Engineering",
[14] N. George, B.V. Kamath, A.G.Basrur, K. R. Krishnamurthy, "Role of Hydrogen in Catalytic Dehydrogenation: Film Diffusion Controlled Deactivation", React. Kinet. Catal. Lett, Vol. 60, No.2, 379-386.
[15] D. T. Gokak, A. G. Basrur, D. Rajeswar, G. S. Rao, K. R. Krishnamurthy, "Lithium Promoted Pt-Sn/Al2O3 Catalysts For Dehydrogenation of n-Decane: Influence of Lithium Metal Precursors", Reac. Kinet. Catal. Lett. Vol. 59, No.2, 315-323, 1996.
[16] N. A. Gaidai and S. L. Kiperman, "Kinetic Models of Catalyst Deactivation in Paraffin Dehydrogenation", Kinetics and Catalysis, Vol. 42, No. 4, 2001, pp. 527-532. Translated from Kinetika i Kataliz, Vol. 42, No. 4, 2001, pp. 581-587. Original Russian Text Copyright ┬® 2001 by Gaidai, Kiperman.
[17] P. Ciambelli, A. Di Benedetto, R. Pirone, G. Russo, "Spontaneous isothermal oscillations in N2O catalytic decomposition: fixed-bed reactor modeling", Chemical Engineering Science 54 (1999) 4521-4527.
[18] M. Bowker, T. Aslam, M. Roebuck, M. Moser, "The effect of coke laydown on n-heptane reforming on Pt and Pt-Sn catalysts", Applied Catalysis A: General 257 (2004) 57-65.
[19] Karine Surla, HankVleeming, Denis Guillaume, Pierre Galtier, "Asingle events kinetic model: n-butane isomerization", Chemical Engineering Science 59 (2004) 4773 - 4779.
[20] Ivano Miracca, Laura Piovesan, "Light paraffins dehydrogenation in a fluidized bed reactor", Catalysis Today 52, (1999), 259-269.
[21] C. Audo, J.F. Lambert, M. Che, B. Didillon, "Synthesis of platinum- tin/alumina reforming catalysts from a well-defined platinum-tin precursor complex", Catalysis Today 65, (2001), 157-162.
[22] P. Praserthdam, N. Grisdanurak, W. Yuangsawatdikul," Short communication Coke formation over Pt-Sn-K/Al2O3 in C3, C5-C8 alkane dehydrogenation", Chemical Engineering Journal 77 (2000) 215- 219
[23] K. Kumbilieva, N.A. Gaidai, N.V. Nekrasov, L. Petrov, A.L. Lapidus, "Types of active sites and deactivation features of promoted Pt catalysts for isobutane dehydrogenation", Chemical Engineering Journal 120, (2006), 25-32.