Patent ID: 6013852
Filing Date: 2000-01-11
Classification: C10G

Abstract:
A process of producing light olefins from a contaminated liquid hydrocarbon feed by means of thermal cracking, which process comprises the steps of(a) supplying the feed to the inlet of a membrane unit provided with a membrane, said membrane unit having a permeate side and a retentate side separated by the membrane, and removing from the permeate side a permeate and from the retentate side a retentate;(b) supplying the permeate to the inlet of a cracking furnace, allowing the permeate to crack in the coils of the cracking furnace in the presence of steam at elevated temperature and removing from the cracking furnace a cracked stream which is enriched in light olefins;(c) quenching the cracked stream;(d) supplying the cooled cracked stream to a fractionation column;(e) supplying the retentate to the fractionation column; and(f) removing from the top of the fractionation column a gaseous stream, from the side of the fractionation column a side stream of fuel oil components and from the bottom of the fractionation column a bottom stream .