A Model of Catalytic Cracking: Product Distribution and Catalyst Deactivation Depending on Saturates, Aromatics and Resins Content in Feed

Abstract

The problems of catalyst deactivation and optimization of the mixed feedstock become more relevant when the residues are involved as a catalytic cracking feedstock. Through numerical and experimental studies of catalytic cracking, we optimized the composition of the mixed feedstock in order to minimize the catalyst deactivation by coke. A pure vacuum gasoil increases the yields of the wet gas and the gasoline (56.1 and 24.9 wt%). An increase in the ratio of residues up to 50% reduces the gasoline yield due to the catalyst deactivation by 19.9%. However, this provides a rise in the RON of gasoline and the light gasoil yield by 1.9 units and 1.7 wt% Moreover, the ratio of residue may be less than 50%, since the conversion is limited by the regenerator coke burning ability.

Development of a Two‐Fluid Hydrodynamic Model for a Riser Reactor

“…In their work, in addition to coking, the authors describe other undesirable thermal cracking reactions that occur in a high-temperature section of a riser. Understanding of kinetics and thermodynamics of the industrial FCC process is also the focus of our recent works [4][5][6][7][8].…”

Simple Model of an Industrial Catalytic Cracking Riser Reactor

“…Reduction in catalyst efficiency due to coking is taken into account by the deactivation factor: a = e − k d · Y coke which definition includes Y coke , the mass fraction of coke, and k d , the catalyst-specific deactivation constant. For the value of the deactivation constant, we use k d = 0.729, the value previously determined in work for the catalyst that is utilized in the industrial unit for which we possess the monitoring data.…”

A Model of Catalytic Cracking: Catalyst Deactivation Induced by Feedstock and Process Variables

“…Previous comprehensive experimental studies allow us to form a reaction network of catalytic cracking [29][30][31]. The formalized mechanism of cracking reactions simplifies the mathematical description of such complicated multicomponent processes and considers SAR composition and reactions resulting in coke formation from these hydrocarbons.…”