Correlation of feedstock chemical properties with conversion and coke yield in heavy atmospheric residue cracking

摘要

Catalytic cracking feed conversion factors are useful tools for crude oil value estimates and FCC unit optimization. Methods that calculate such factors for feedstocks boiling in 320 deg C to 550 deg C range are available in the literature~((1,2)). With the start-up of PETROBRAS residue crackers, processing feedstocks with a substantial portion heavier than the VGO endpoint, new analytical procedures for residue characterization, capable of generating conversion and coke selectivity factors for extremely heavy feedstocks, were neccessary.