Claims
- 1. A process for converting heavy hydrocarbonaceous feedstocks to lower boiling products, which process comprises:
- (a) forming a mixture of the hydrocarbonaceous feedstock and up to about 10 wt. % coal, based on the total weight of feedstock and coal,
- (b) heating the mixture to a temperature from about 500.degree. F. to about 700.degree. F. from 30 minutes to 2 hours;
- (c) passing the mixture to a coking zone comprised of a bed of fluidized solids maintained at fluid coking conditions, including temperatures from about 850.degree. F. to 1200.degree. F., thereby producing a vapor phase product including normally liquid hydrocarbons, and coke, said coke depositing on the fluidized solids;
- (d) introducing a portion of said solids, with coke deposited thereon, into a heating zone comprised of a fluidized bed of solid particles and operated at a temperature greater than said coking zone, and in which the fluidizing gas is a mixture of steam and an oxygen-containing gas; and
- (e) recycling a portion of said heated solids from said heating zone to said coking zone.
- 2. The process of claim 1 wherein the amount of coal ranges from about 4 to 8 wt. %.
- 3. The process of claim 1 wherein the heating zone is maintained at a temperature which is about 100.degree. to 400.degree. F. greater than the coking zone.
- 4. The process of claim 3 wherein the heating zone is maintained at a temperature which is about 150.degree. to 250.degree. F. greater than the coking zone.
- 5. The process of claim 1 wherein the fluidizing gas of the heating zone is steam only and a portion of the solids from the heating zone is passed to a gasification zone comprising a fluidized bed of solid particles which is maintained at a temperature greater than the heating zone and wherein the fluidizing gas is a mixture of steam and an oxygen-containing gas, and wherein a portion of the gasified solid particles is recycled to the heating zone.
- 6. The process of claim 5 in which the gasification zone is maintained at a temperature of about 1600.degree. to 2000.degree. F.
- 7. The process of claim 5 wherein the heating zone is maintained at a temperature which is about 100.degree. to 400.degree. F. higher than that of the coking zone and from about 4 to 8 wt. % coal is used.
Parent Case Info
This is a continuation of U.S. appl. Ser. No. 591,337 filed Oct. 1, 1990 now abandoned.
US Referenced Citations (13)
Continuations (1)
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Number |
Date |
Country |
Parent |
591337 |
Oct 1990 |
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