Influence of hydrotreatment depth on product composition of fluid catalytic cracking process for light olefins production.

[Display omitted] • Influence of HDT depth on material balance of FCC process was studied. • Hydrotreating does not influence valuable olefins yield. • Prehydrotreating decreases sulfur in liquid products. • Removal of N compounds increases activity of FCC catalyst. • Increase of HDT depth results in the increase of hydrogen transfer coefficient. The present work studies the influence of nitrogen compounds in hydrotreated fluid catalytic cracking (FCC) feedstock on the material balance of FCC process focused on petrochemistry. Vacuum gas oil was hydrotreated at the temperatures of 340–370 °C in typical FCC pretreatment conditions. The obtained hydrotreated products contained 370−750 ppm of nitrogen and 150−820 ppm of sulfur. Hydrotreated feedstock was exposed to the FCC process over a zeolite catalyst at the laboratory unit with a fixed bed catalyst at 527 °C and catalyst/oil ratio - 2−6. The FCC feedstock before and after hydrotreatment and FCC products were characterized by different methods to study the effect of nitrogen compounds on the FCC process. [ABSTRACT FROM AUTHOR]