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US 4,331,529 AGranted
Fluid coking and gasification process
AssigneeExxon Research & Engineering Co.
InventorsMerlan M. Lambert, Joseph P. Matula
Life of this patent
Estimating the term…
Abstract
An integrated fluid coking and gasification process is provided in which a portion of the coke is gasified in a first gasification zone in the presence of an oxygen-containing gas to produce a hot gas and hot coke. A portion of the resulting hot coke is gasified in a second gasification zone in the presence of steam to produce a gas comprising hydrogen and carbon monoxide, which is suitable, after conventional shift and clean up, for use as synthesis gas.
Claims19
An integrated coking and gasification process comprising the steps of:
- (a) reacting a carbonaceous chargestock in a coking zone containing a bed of fluidized solids maintained at fluid coking conditions to produce a vapor phase product, including normally liquid hydrocarbons, and coke, said coke depositing on said fluidized solids;
- (b) introducing a portion of said solids with the coke deposit thereon to a first fluid bed gasification zone maintained at gasification conditions;
- (c) reacting said portion of solids in said first gasification zone with an oxygen-containing gas to produce a first gaseous stream and partially gasified coke and supplying heat from said first gasification zone to said coking zone;
- (d) introducing a portion of said partially gasified coke from said first gasification zone to a second fluid bed gasification zone maintained at gasification conditions, said partially gasified coke supplying heat to said second gasification zone;
- (e) reacting said portion of partially gasified coke in said second gasification zone with a gas comprising steam in the absence of added oxygen-containing gas to produce a second gaseous stream wherein said second gaseous stream has a higher heating value than the heating value of said first gaseous stream, and
- (f) recycling a portion of said partially gasified coke from said second gasification zone to said first gasification zone.
3 more elements
An integrated coking and gasification process comprising the steps of:
- (a) reacting a carbonaceous chargestock in a coking zone containing a bed of fluidized solids maintained at fluid coking conditions, including a temperature ranging from about 850.degree. F. to about 1400.degree. F., to produce a vapor phase product, including normally liquid hydrocarbons, and coke, said coke depositing on said fluidized solids;
- (b) introducing a portion of said solids with the coke deposit thereon into a heating zone operated at a temperature greater than said coking zone temperature to heat said portion of solids;
- (c) recycling a first portion of heated solids from said heating zone to said coking zone;
- (d) introducing a second portion of said heated solids to a first fluid bed gasification zone maintained at gasification conditions, including a temperature ranging from about 1500.degree. F. to about 2000.degree. F.;
- (e) reacting said second portion of said heated solids in said first gasification zone with a molecular oxygen-containing gas to produce a first gaseous stream and partially gasified coke and supplying heat from said first gasification zone to said heating zone of step (b);
- (f) introducing a portion of said partially gasified coke from said first gasification zone to a second fluid bed gasification zone maintained at gasification conditions, including a temperature ranging from about 1500.degree. F. to about 2000.degree. F., said partially gasified coke supplying heat to said second gasification zone;
- (g) reacting said portion of partially gasified coke in said second gasification zone with a gas comprising steam to produce a second gaseous stream, said second gaseous stream comprising hydrogen and carbon monoxide wherein said second gaseous stream has a higher heating value then the heating value of said first gaseous stream, and
- (h) recycling a portion of said partially gasified coke from said second gasification zone to said first gasification zone.
5 more elements
Dependencies are inferred from the claim text.