https://doi.org/10.15255/KUI.2003.017
Published: Kem. Ind. 52 (10) (2003) 501–506
Paper reference number: KUI-17/2003
Paper type: Conference paper
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Influence of FCC Feed on the Characteristics of Cracking Gasoline

M. Fabulić Ruszkowski, S. Telen, Š. Podolski and I. Beer Romac

Abstract

Gasoline obtained by the fluid catalytic cracking proces participates with 40 vol. % in motor gasoline, thus giving 98 % of the total sulphur content. These two facts warn of the significance of FCC gasoline, as well as indicate that solving the sulphur problem in cracking gasoline, actually, solves the sulphur problem in motor gasoline. The quality of gasoline in the FCC proces itself can be influenced by selection of the proces parameters, the catalyst, and feedstock. Tests have been performed by means of the Microactivity Test (MAT ASTM D 3907) in a fixed bed reactor with different feedstock (hydrodesulphurised and non- hydrodesulphurised). By changing the temperature (from 755.15 to 813.15 K), various conversions were achieved with the constant catalyst/feedstock ratio of 3.01. FCC gasoline is obtained by fractionating the liquid product from the MAT in a microfractionator. The hydrocarbon composition of the FCC gasoline is determined by the gas-chromatographic method, while the RON is determined on the basis of the hydrocarbon composition. The highest conversion and yield was achieved with the hydrotreated feedstock. The hydrocarbon composition of the FCC gasoline was determined. The relations were confirmed of the physical and chemical feedstock characteristics with the observed gasoline properties (RON, sulphur content and hydrocarbon composition). Gasoline with a lower sulphur content has a lower octane number. The reduction of the octane number brought about by feedstock hydrotreatment in motor gasoline is compensated by adding high-octane components such as MTBE, isomerizates, alkylates, and reformates. The RON number can be efficiently influenced by the application of octane catalysts, selection of proces parameters, and feedstock. The set requirements for motor gasoline sulphur content are achieved by efficient pretreatment of the FCC feedstock or by post-treatment of the FCC product, as well as with the use of low-sulphur oils, and application of sulphur-reducing FCC catalysts and additives.

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Keywords

FCC gasoline, research octane number (RON), microactivity test (MAT), sulphur content