Critical Phenomena of an Exothermic Reaction Proceeding on a Partially Wetted Porous Catalyst Grain

A mathematical model has been developed to analyze gas–liquid hydrogenation reactions of hydrocarbons accompanied by liquid evaporation and chemical transformation in liquid and vapor phases on a porous catalyst grain. Critical phenomena caused by the joint action of the exothermic catalytic reaction, phase transitions, multicomponent diffusion, and capillary penetration (percolation) are numerically studied. The domains of multiplicity of stationary modes are determined, depending on wetting of the external surface of the catalyst grain, activity of the catalyst reaction heat, evaporation heat, and parameters characterizing grain impregnation by the liquid. The adequacy of the results obtained by the mathematical model was validated by experimental data. Key words: multiphase processes, exothermic reaction, porous catalyst grain, mathematical simulation.

[1]  V. A. Kirillov,et al.  Mathematical Model of a Catalytic Process on a Porous Grain in a Gas–Liquid–Solid Three-Phase System , 2001 .

[2]  C. Satterfield,et al.  Direct solid‐catalyzed reaction of a vapor in an apparently completely wetted trickle bed reactor , 1973 .

[3]  M. Harold,et al.  Dynamic effects of vaporization with exothermic reaction in a porous catalytic pellet , 1993 .

[4]  Ka Ming Ng,et al.  A novel model for reaction in trickle beds with flow maldistribution , 1990 .

[5]  J. M. Smith,et al.  Catalyst particle effectiveness with unsymmetrical boundary conditions , 1980 .

[6]  C. Kenney,et al.  Partial wetting in trickle bed reactors — the reduction of crotonaldehyde over a palladium catalyst , 1973 .

[7]  A. Germain,et al.  Experimental Study of a Catalytic Trickle Bed Reactor , 1975 .

[8]  Michael P. Harold,et al.  Rate enhancement and multiplicity in a partially wetted and filled pellet: Experimental study , 1994 .

[9]  F. V. D. Brink,et al.  Reactor runaway in pyrolysis gasoline hydrogenation , 1997 .

[10]  Michael P. Harold,et al.  Bimolecular exothermic reaction with vaporization in the half-wetted slab catalyst , 1993 .

[11]  E. A. Mason,et al.  Gas Transport in Porous Media: The Dusty-Gas Model , 1983 .

[12]  Rajamani Krishna,et al.  MASS AND ENERGY TRANSFER IN MULTICOMPONENT SYSTEMS , 1979 .

[13]  G. A. Hughmark,et al.  Mass and heat transfer from rigid spheres , 1967 .

[14]  Dong hyun Kim,et al.  AN EXPERIMENTAL STUDY OF MULTIPLE STEADY STATES IN A POROUS CATALYST DUE TO PHASE TRANSITION , 1981 .