On the particle size distribution function and the attrition of cracking catalysts

✍ Scribed by J. E. Gwyn

• Publisher: American Institute of Chemical Engineers
• Year: 1969
• Tongue: English
• Weight: 444 KB
• Volume: 15
• Category: Article
• ISSN: 0001-1541
• DOI: 10.1002/aic.690150112

✦ Synopsis

The rate of attrition of a catalyst rample, of a single particle size, can be expressed by a simple function of initial diameter and time. The initial rate is a function of initial diameter, whereas the decrease in attrition rate of a catalyst of a given size as it ages depends only on time.

The attrition equation for a single size of particles is introduced into the particle size distribution function and, through mathematical analyses, yields a relationship for the attrition of a full size-range catalyst. The form of this relationship, which includes terms for attritability and severity of attrition conditions, is verified by laboratory and commercial attrition data on two full-range catalysts. The size distribution of a n attrited sample is not expressible in simple analytical form, but is readily obtained by numerical analysis.