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Diffusion and Reactivity of Gas Oil in FCC Catalysts SULAIMAN Al-KHATTAF, HUGO I. de LASA*
 

Summary: 1
Diffusion and Reactivity of Gas Oil in FCC Catalysts
SULAIMAN Al-KHATTAF, HUGO I. de LASA*
Chemical Reactor Engineering Centre
Faculty of Engineering, University of Western Ontario
London, Ontario, Canada N6A 5B9
(*) Author to whom correspondence may be addressed
Phone : (519)661-2144, Fax(519)661-3498, EM:hdelasa@eng.uwo.ca
2
Abstract
This study considers the effects of diffusion and intrinsic catalytic reactivity for
the cracking of gas oil on FCC catalysts. A four-lump kinetic model, initially developed
in a novel CREC Simulator, is employed to estimate the unconverted gas oil, the
gasoline, the light gases and the coke fractions. The model incorporates a modified
Thiele modulus, based on zeolite crystal properties, and an effectiveness factor. The
calculated effectiveness factor is found to increase with the gas oil conversion and to
decrease with the intrinsic rate constant and the zeolite crystal size. The proposed model
predicts that crystal size changes in the 0.13 to 1.3-m range affect both primary and
secondary cracking reactions and the yields of gasoline, coke and light gas yields.
Key words: FCC, cracking catalysts, diffusion, reaction, zeolite size

  

Source: Al-Khattaf, Sulaiman - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals

 

Collections: Fossil Fuels; Engineering