Coking process with hot solids recycled to the stripping zone

In a fluid coking process wherein a heavy hydrocarbonaceous chargestock is converted to lower boiling products, which fluid coking process comprises:

• (a) reacting a heavy hydrocarbonaceous chargestock in a fluid coker comprised of:
• (i) a coking zone containing a fluidized bed of solid particles and maintained at a temperature from about 850.degree. F. to about 1200.degree. F. and a pressure from about 0 to 150 psig, into which is fed the chargestock;
• (ii) a scrubbing zone wherein the vapor phase product of the coking zone is passed;
• and (iii) a stripping zone at the bottom of said coking zone for removing at least a portion of adherent hydrocarbons from the solids;
• (b) removing a stream of the resulting stripped solids from said stripping zone and passing it to a heating zone which is operated at a temperature from about 100.degree. F. to about 400.degree. F. in excess of said coking zone, also comprised of a bed of fluidized solids;
• (c) recycling a portion of said heated solids from said heating zone to said fluid coker at the coking zone;
• and
• (d) passing another portion of said heated solids from said heating zone to a gasification zone which is maintained at a temperature from about 1600.degree. F. to about 2000.degree. F. in the presence of steam, with the proviso that the gasification zone be maintained at a temperature higher than that of the heating zone;
• the improvement which comprises recycling a portion of said gasified heated solids from the gasification zone to said fluid coker at the stripping zone.