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US 4,289,603 AGranted
Cryogenic fractionator gas as stripping gas of fines slurry in a coking and gasification process
AssigneeExxon Research & Engineering Co.
InventorCharles W. DeGeorge
Life of this patent
Estimating the term…
Abstract
In an integrated coking and gasification process wherein a stream of fluidized solids is passed from a fluidized bed coking zone to a second fluidized bed and wherein entrained solid fines are recovered by a scrubbing process and wherein the resulting solids-liquid slurry is stripped with a stripping gas to remove acidic gases, at least a portion of the stripping gas comprises a gas comprising hydrogen, nitrogen and methane separated from the coker products.
Claims18
In an integrated coking and gasification process comprising the steps of:
- (a) reacting a carbonaceous material in a coking zone containing a bed of fluidized solids maintained at fluid coking conditions to produce coke and a vapor phase product including hydrocarbons, said coke depositing on said fluidized solids;
- (b) separating from said vapor phase product a gas comprising hydrogen and nitrogen and methane;
- (c) 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;
- (d) recycling a first portion of heated solids from said heating zone to said coking zone;
- (e) introducing a second portion of said heated solids to a fluid bed gasification zone maintained at a temperature greater than said heating zone;
- (f) reacting said second portion of heated solids in said gasification zone with steam and an oxygen-containing gas to produce a hot gaseous stream comprising hydrogen;
- (g) introducing said hot gaseous stream comprising hydrogen and entrained solids into said heating zone;
- (h) passing an additional stream of solids from said gasification zone to said heating zone;
- (i) recovering from said heating zone the resulting cooled gaseous stream comprising hydrogen, acidic gases and entrained solids;
- (j) separating at least a portion of said entrained solids from said cooled gaseous stream of step (i);
- (k) scrubbing the resulting gaseous stream containing said solids with a liquid to form a liquid-solids slurry containing acidic gases and recovering a scrubbed fuel gas;
- (l) contacting the liquid-solids slurry with a stripping gas in a stripping zone to remove at least a portion of the acidic gases from said slurry and then passing the vaporous effluent from the stripping zone to a gas cleanup unit, the improvement which comprises passing at least a portion of said separated gas of step (b) to said stripping zone of step (l).
9 more elements
In a combination coal liquefaction, fluid coking and gasification process which comprises the steps of:
- (a) subjecting coal to coal liquefaction conditions in the presence of a hydrogen donor solvent in a coal liquefaction zone to produce a hydrocarbonaceous liquid product and a coal liquefaction bottoms fraction;
- (b) passing said coal liquefaction bottoms fraction to a fluid coking zone containing a bed of fluidized solids maintained at fluid coking conditions to produce coke and a vapor phase product including hydrocarbons, said coke depositing on said fluidized solids;
- (c) separating from said vapor phase product a gas comprising hydrogen, nitrogen, and methane;
- (d) introducing a portion of said solids with a coke deposit thereon into a heating zone operated at a temperature greater than said coking zone temperature to heat said portion of solids;
- (e) recycling a first portion of heated solids from said heating zone to said coking zone;
- (f) introducing a second portion of said heated solids to a fluid bed gasification zone maintained at a temperature greater than said heating zone temperature;
- (g) reacting said second portion of heated solids in said gasification zone with steam and an oxygen-containing gas to produce a hot gaseous stream comprising hydrogen;
- (h) introducing said hot gaseous stream comprising hydrogen and entrained solids into said heating zone;
- (i) passing an additional stream of solids from said gasification zone to said heating zone;
- (j) recovering from said heating zone the resulting cooled gaseous stream comprising hydrogen, acidic gases and entrained solids;
- (k) separating at least a portion of said entrained solids from said cooled gaseous stream of step (j);
- (l) scrubbing the resulting gaseous stream containing said solids with a liquid to form a liquid-solids slurry comprising acidic gases and recovering a scrubbed fuel gas;
- (m) contacting the liquid-solids slurry with a stripping gas in a stripping zone to remove at least a portion of the acidic gases therefrom and then passing the vaporous effluent from the stripping zone to a gas cleanup unit, the improvement which comprises passing at least a portion of said separated gas of step (c) to said stripping zone of step (m).
10 more elements
Dependencies are inferred from the claim text.