Results 251 to 260 of about 82,500 (309)
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Autothermal fixed-bed reactor concepts
Chemical Engineering Science, 2000The principles, properties and applications of autothermal fixed-bed reactor concepts are presented. First we focus on different reactor types for weakly exothermic reactions and discuss their basic behavior, their stability and nonlinear dynamic features. The second part is devoted to the autothermal coupling of endothermic and exothermic reactions. A
G Kolios, J Frauhammer, G Eigenberger
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STABILITY OF COUNTERCURRENTLY COOLED FIXED BED REACTORS
IFAC Proceedings Volumes, 1977Abstract The extension of the Lyapunov direct method to distributed parameter systems is used to obtain sufficient conditions for the local stability of steady states in countercurrently cooled fixed bed catalytic reactors. The conditions are in form of inequalities which require only steady state information. The stability criteria are identified in
C. McGreavy, M.A. Soliman
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Parametric sensitivity in fixed-bed reactors
Chemical Engineering Science, 1975Parametric sensitivity in fixed-bed reactors has been analysed by previous workers using the quasihomogeneous model [i.e. for the kinetic regime only]. In the present paper a general treatment is proposed in which transport limitations are also considered.
R.A. Rajadhyaksha +2 more
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Catalysis Today, 1999
Abstract The present paper presents the phenomena occurring in fixed bed reactors spanning, from the small scale of single pellet, where reaction and diffusion are competing, to the macroscale of whole apparatus, where dispersion and heat transfer play an important role; the most important models used in describing the behaviour of fixed bed reactors
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Abstract The present paper presents the phenomena occurring in fixed bed reactors spanning, from the small scale of single pellet, where reaction and diffusion are competing, to the macroscale of whole apparatus, where dispersion and heat transfer play an important role; the most important models used in describing the behaviour of fixed bed reactors
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Asymptotic Observers for Fixed Bed Reactors
1993 American Control Conference, 1993This paper deals with the on-line estimation of reactant and product concentrations in fixed bed reactors. It is shown how to extend to tubular reactors the asymptotic observer developed for stirred tank reactors. The proposed observer can be viewed as an alternative to classical observers (extended Kalman filter and extended Luenberger observer).
D. Dochain, M. Perrier
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Modeling of fixed bed catalytic reactors
Computers & Chemical Engineering, 1985Abstract The simulation of a fixed-bed catalytic reactor requires the selection of a model, which is a set of balance equations that describes the reactor, as well as correlations for the model parameters involved. In this work general criteria, leading to a better choice of a model that fulfills the objectives of the simulation, are established ...
O.M. Martinez +2 more
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Computational Fluid Dynamics for Fixed Bed Reactor Design
Annual Review of Chemical and Biomolecular Engineering, 2020Flow, heat, and mass transfer in fixed beds of catalyst particles are complex phenomena and, when combined with catalytic reactions, are multiscale in both time and space; therefore, advanced computational techniques are being applied to fixed bed modeling to an ever-greater extent.
Anthony G, Dixon, Behnam, Partopour
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A Novel Countercurrent Fixed Bed Reactor
The Canadian Journal of Chemical Engineering, 2003AbstractA new three‐phase reactor configuration having countercurrent flow of gas and liquid is proposed. The reactor had an internal diameter of 0.04 m and a catalyst bed height of 1 m. A spiral coil made out of wire gauge was inserted inside the fixed bed of catalyst.
Arunabha Kundu +2 more
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Kinetics of thermophilic anaerobes in fixed-bed reactors
Chemosphere, 2001The main objective of this study is to estimate growth kinetic constants and the concentration of "active" attached biomass in two anaerobic thermophilic reactors which contain different initial sizes of immobilized anaerobic mixed cultures and decompose distillery wastewater.
M, Perez, L I, Romero, D, Sales
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Pulsation in a fixed‐bed reactor
AIChE Journal, 1963AbstractRates of reaction were measured for the liquid phase hydrogenation of α‐methyl styrene in a pulsed, fixed bed reactor. Data at 80 psia and 55°C., using 0.5 wt. % palladium on ⅛″ Al2O3 spheres as a catalyst, indicated that the mass transfer of dissolved hydrogen to the catalyst surface controlled the rate of conversion of styrene to cumene ...
E. G. Biskis, J. M. Smith
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