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Length‐to‐Diameter Ratio of Extrudates in Catalyst Technology: III. Catalyst Breakage in a Fixed Bed
Author(s) -
Beeckman Jean W. L.,
Cunningham Majosefina,
Fassbender Natalie A.,
Datz Theodore E.
Publication year - 2017
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201600550
Subject(s) - breakage , dimensionless quantity , materials science , die swell , composite material , stress (linguistics) , mechanics , extrusion , physics , linguistics , philosophy
A correlation is demonstrated to predict the reduction in the mean length‐to‐diameter ratio of catalyst extrudates by breakage due to stress in a fixed bed. The stress can be caused either by the reactor load or it can be externally applied as in the bulk crush strength measurement. The strength characteristic of particular interest here is the extrudate bending strength characterized by the Euler‐Bernoulli modulus of rupture. The balance of the bending strength to the applied stress leads to a new dimensionless group. Extrudates in a fixed bed start to break above a specific critical stress, and their mean length‐to‐diameter ratio then becomes linearly proportional to this dimensionless group to the power one‐third.