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Effectiveness factor under cyclic operation of a reactor
Author(s) -
Jain A. K.,
Hudgins R. R.,
Silveston P. L.
Publication year - 1985
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450630126
Subject(s) - cycling , steady state (chemistry) , diffusion , temperature cycling , thermodynamics , materials science , chemistry , control theory (sociology) , physics , computer science , control (management) , archaeology , thermal , artificial intelligence , history
Results are reported on the influence of intraparticle diffusion on the measured rate of reaction under a condition where the feed composition is changing periodically. The specific application is to cyclic operation of an ammonia synthesis reactor. The effectiveness factor calculated relative to the steady‐state kinetic rates for the time‐average feed condition for fine particles was higher than the comparable steady‐state effectiveness factor as a result of the rate improvement due to cycling. The effectiveness factor calculated relative to the time‐average rate of reaction under cyclic operation for the fine particles was much less than unity and similar numerically to the steady‐state effectiveness factor. The cycling effectiveness factor by either definition varied with cycling conditions because of the complex interaction of cycling parameters.