Method for enhancing distillate liquid yield from an ethylene cracking process

Claim 1

A combination catalytic and thermal cracking process comprising catalytically cracking a relatively high boiling relatively high sulfur hydrocarbon feed oil comprising a 650° F.+ heavy gas oil or residual oil in the presence of entrained zeolite cracking catalyst at a temperature between about 900° and 1,100° F. and recovering catalytically cracked effluent including catalytically cracked liquid product, separating said catalytically cracked liquid product into a catalytically cracked residue liquid containing slurried catalyst particles and a catalytically cracked distillate liquid; thermally and non-catalytically cracking a lower boiling and lower sulfur hydrocarbon feed oil to produce ethylene in the presence of entrained catalytically inert hot solids and a gaseous diluent at a temperature between about 1,300° and 2,500° F. and recovering a thermally cracked effluent including gaseous products and thermally cracked liquid product, injecting said catalytically cracked residue liquid containing slurried catalyst particles into said thermally cracked effluent to thermally quench said thermally cracked effluent, recovering coke-laden solids from said thermally cracked effluent, passing said coke-laden solids to a coke burner, separating said thermally cracked liquid product into a thermally cracked residue liquid containing catalytically cracked residue liquid and slurried solids and a thermally cracked distillate liquid; and passing said thermally cracked residue slurry liquid containing catalytically cracked residue liquid and slurried solids to said coke burner for combustion as burner fuel.