PROCESS AND APPARATUS FOR PRODUCING AND RECYCLING CRACKED HYDROCARBONS

摘要

A process and apparatus is for recycling LCO and/or HCO to an FCC unit to recover additional distillate. Spent catalyst recycle in the FCC unit may be used to improve distillate yield. A hydroprocessing zone may saturate cycle oil aromatics for cracking in an FCC unit. The recycle cracked stream may be recycled to a downstream hydroprocessing zone to avoid a first hydroprocessing zone for hydrotreating feed to the FCC unit. Additional recovery of cycle oil for recycle is obtained by heating slurry oil prior to vacuum separation.

主权项

1. An apparatus for catalytically cracking hydrocarbons comprising:
an FCC reactor for contacting a hydrocarbon feed stream with catalyst to provide a cracked stream; a main fractionation column in downstream communication with said FCC reactor for fractionating said cracked stream into products including a slurry oil stream; a slurry heater in downstream communication with a main outlet in a bottom of said main fractionation column for heating said slurry oil stream; a vacuum separator in downstream communication with said slurry heater for separating said heated slurry oil stream into a cycle oil stream and a heavy stream under vacuum pressure.