TY - JOUR
AU - Petersen, E. E.
AB -  This communication concerns the article entitled “On the Interdependence of Temporary and Permanent Deactivation in a Reactor-Regenerator System,” by J. E. Gwyn and J. D. Colthart ( I ) . The main point of this article is correct in principle, namely, that “catalyst particles that undergo an appreciable degree of permanent deactivation per cycle cannot be considered to have time independent temporary and permanent deactivation.” I believe the authors perform a service in pointing out this fact lest the equations derived by Petersen (2) be applied to a case where this is true. What the article does not make clear and what $rompts this response is that the hypothetical example at the end of their article indicates an error of 25% in the use of Petersen’s equations. This is far different from the result one would obtain if more realistic values for catalytic cracking are substituted for the parameters. In the nomenclature of their article, the constants for catalytic cracking have “first-order” values of the order of: Assume inventory of, say, 80 tons P = lO-‘j/sec. and makeup of about 1 ton/day. 120 tons/hr. recirculation lO-s/sec. 40 tons or half of catalyst in the reactor. See Blanding ( 
TI - On the calculation of catalytic cracking reactor‐regenerator units with permanent and temporary deactivation
JF - Aiche Journal
DO - 10.1002/aic.690160329
DA - 1970-05-01
UR - https://www.deepdyve.com/lp/wiley/on-the-calculation-of-catalytic-cracking-reactor-regenerator-units-lCCjCmzCQn
SP - 490
EP - 490
VL - 16
IS - 3
DP - DeepDyve
ER -