FIXED-BED TRANSITIONS


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FIXED-BED TRANSITIONS
FIXED-BED TRANSITIONSAs discussed in the subsection Design Concepts, a large fraction of adsorption and ion-exchange processes takes place in fixed beds. Two classical methods for analyzing fixed-bed transitions are described here. First, local equilibrium theory is presented. In this theory, all mass-transfer resistances are ignored to focus on the often-dominating role of isotherm shape. Second, results of constant pattern analysis are presented. This gives the maximum breadth to which a mass-transfer zone will spread for various rate mechanisms. It is therefore conservative for design purposes. Both of these methods pertain to behavior in deep beds. For shallow beds, the equations that follow must be solved for the particular case of interest.
Citation
Dr. Don W. Green; Dr. Marylee Z. Southard: Perry's Chemical Engineers' Handbook, 9th Edition. FIXED-BED TRANSITIONS, Chapter (McGraw-Hill Professional, 2019), AccessEngineering Export