OP-II-3

PP-II-18с m , с cat – density of mixture and catalyst, kg/m 3 ; С m р , С cat р - heat capacity of mixtureand catalyst, J/(kg·K); Q j – j-th reaction heat, J/mol; Т – temperature, K; W j – j-threaction rate, mol/(m 3·h).In moving-bed reactors catalyst activity changes through the radius and height ofcatalyst layer and with time. The coke concentration can be calculated according tothe kinetics of coke formation. The catalyst activity will decrease with the cokeconcentration increase and will depend from the catalyst circulating factor (h cir ) theC / hfollowing way:a = A ⋅ e −α⋅coke cir0where А 0 – linear component determining the number of catalyst active centres;α – coefficient of catalyst poisoning - nonlinear component that determines differentextent of angle and edge atoms deactivation due to coking. Calculations show that3≤α≤5.9 - for reactions on metal sites of catalyst; 0.3≤α≤0.52 - for reactions on acidsites of catalyst.Catalyst circulating factor can be calculated as:hciru ⋅ ρm=ϕ ⋅ ρcatIn this work we have presented a mathematical model for a moving-bed catalyticreforming reactor taking into account activity and circulating factor of the catalyst.References[1]. Smith R.B. Kinetic analysis of naphtha reforming with platinum catalyst // Chem. Eng. Prog., 1959,№55(6), p. 76-80.[2]. Krane H.G. Reactions in Catalytic Reforming Naphtha // Proceeding of the 5th World PetroleumCongress , 1959, p. 39- 51.[3]. Zhorov Y.M. Mathematical Description of Platforming for Optimization of a Process (I) // Kinetika iKataliz, 1965, №6(6), p. 1092 – 1098.[4]. Henningsen J. Catalytic Reforming // Chem. Eng., 1970, №15, p. 1073 -1087.[5]. Kmak W.S. A Kinetic Simulation Model of the Power Forming Process ;AIChE Meeting, Houston,TX, 1972.[6]. Marin G.B. Froment G.F. The Development and Use of Rate Equations for Catalytic RefineryProcesses // EFCE Publ. Ser., 1983, Vol 2. , №27, p. 117.[7]. Froment G.F. Modelling of Catalytic Reforming Unit // Chem.Eng.Sci., 1987, №42, p. 1073 –1087.[8]. Unmesh Taskar & James B.Riggs Modelling & Optimization of Semi Regenerative CatalyticNaphtha Reformer // AIChE J., 1997, №43 (3), p. 740 – 753.[9]. Sharikov Yu.V., Petrov P.A. Universal model for catalytic reforming // Chemical and PetroleumEngineering, 2007, vol. 43, p. 580-584.[10]. Gyngazova M.S., Kravtsov A.V., Ivanchina E.D., Abramin A.L. Computer modeling of catalyticreforming process in moving-bed reactor with continuous catalyst regeneration // Abstracts XVIIIInternational Conference on Chemical Reactors CHEMREACTOR-18, Malta, 2008, p. 127–128.365