Fluid catalytic cracking gasoline yields

A number of mechanistic modeling studies to explain the fluid catalytic cracking process and to predict the yields of valuable products of the FCC unit have been performed in the past. Weekman and Nace (1970) presented a reaction network model based on the assumption that the catalytic cracking kinetics are second order with respect to the feed concentration and on a three-lump scheme. The first lump corresponds to the entire charge stock above the gasoline boiling range, the second... 

Octane barrel yield a measure used to evaluate fluid catalytic cracking processes defined as (RON + MON)/2 times the gasoline yield, where RON is the research octane number and MON is the motor octane number. 

A series of experiments varying temperature, micro-sphere size and time on stream have been performed in a fixed fluidised bed microactivity reactor to study the role of intraparticle diffusion in commercial fluid catalytic cracking (FCC) catalysts, particularly on gasoline yield and catalyst deactivation by coke deposition, for the cracking of a vacuum gas oil. Additionally, a mechanistic model that describes interface and intrapartide mass transfer interactions with the cracking reactions, has been used to study the combined influence of pore size and intraparticle mass diffusion on the deactivation of FCC catalysts and the gasoline yield. 

Elshishini, S. S., and Elnashaie, S. S. E. H. Digital simulations of industrial fluid catalytic cracking units— II. Eflect of charge stock composition on bifurcation and gasoline yield. Chem. Eng. Sci. 45(9), 2959-2964, 1990. 

Cracking of plastic wastes to gasoline and fuel oil in fluid catalytic cracker (FCC) should be more attractive than other pyrolysis processes except when the pyrolysis process is highly selective to high valued monomers, [3]. Most likely the presence of fillers in the waste can be compensated for by catalyst additions. Studies have shown that, in an FCC unit, the following significant product yields are obtained ... 

The high influence of cracking catalyst on PE conversion was confirmed by Aguado et al. [11] in a continuous screw kiln reactor. The application of a sophisticated laboratory Al-MCM-41 cracking catalyst and process temperature of 400-450°C led to 85-87% yield of gas and gasoline fractions (C1-C12). Besides olefins and n- and iso-paraffins some quantity of aromatics, 5 wt% was determined in the process products. In the same reactor system with a noncatalytic process the gas yield was halved while similarly as in case of the fluid reactor system yields of gas oil and heavy waxes fraction (C13-C55) attained values of 62% (compared with 4 wt% in catalytic process) [12]. 

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