Apparatus for fluid catalytic cracking oligomerate

摘要

Distillate cracks to propylene more readily than VGO. Additionally, less branched hydrocarbons crack to propylene more readily than more branched hydrocarbons. Oligomerization to diesel range oligomers followed by catalytic cracking with less branched oligomers can provide more propylene.

主权项

1. An apparatus for making propylene comprising:
an FCC zone for cracking a hydrocarbon feed stream from a hydrocarbon feed line and a distillate recycle stream comprising distillate hydrocarbons over an FCC catalyst to produce a cracked product stream; an FCC recovery zone in communication with said FCC zone for recovering a propylene product stream and an oligomerization feed stream comprising C4 olefins from said cracked product stream; an oligomerization zone in communication with said FCC recovery zone for oligomerizing C4 olefins in said oligomerization feed stream to produce an oligomerate stream; and an oligomerization recovery zone in downstream communication with said oligomerization zone for separating said oligomerate stream; a debutanizer column in said oligomerization recovery zone for separating said oligomerate stream into a vaporous oligomerate overhead light stream in a overhead line and a liquid oligomerate bottom stream in a bottom line, the bottom line in upstream communication with the oligomerization zone; a depentanizer column in said oligomerization recovery zone for separating the first liquid oligomerate bottom stream into an intermediate stream in an intermediate line and a liquid oligomerate bottom product stream in a bottom product line, the bottom product line being in upstream communication with the oligomerization zone; and a distillate separator column in said oligomerization recovery zone for separating a gasoline stream from a distillate stream, said FCC zone being in communication with said distillate separator column.