PROCESS AND APPARATUS FOR CRACKING HYDROCARBONS WITH RECYCLED CATALYST TO PRODUCE ADDITIONAL DISTILLATE

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. A process for catalytically cracking hydrocarbons comprising:
feeding a fresh hydrocarbon feed stream to a hydroprocessing zone to hydroprocess the hydrocarbon feed stream to provide a hydroprocessed effluent stream; separating hydroprocessed products from said hydroprocessed effluent stream to provide an FCC feed stream; feeding said FCC feed stream to an FCC reactor and contacting said FCC feed stream with catalyst to catalytically crack said FCC feed stream to provide a cracked stream; disengaging said catalyst from said cracked stream; regenerating a first portion of said catalyst disengaged from said cracked stream; and recycling a second portion of said catalyst disengaged from said cracked stream to be contacted with said FCC feed stream without undergoing regeneration, wherein said second portion has about 0.7 to about 1.1 wt % coke on catalyst.