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US 4,544,476 AGranted
Coal liquefaction and hydrogenation
AssigneeThe Lummus Company
InventorsRaymond H. Long, Harvey D. Schindler
Life of this patent
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Abstract
In a two-stage liquefaction, hydrogenated 850.degree. F.+ residuum from the second stage is used in formulating the first stage liquefaction solvent.
Claims10
A two-stage process for the liquefaction of coal, comprising:
- contacting coal with liquefaction solvent in a first stage coal liquefaction zone to produce a first effluent;
- hydrogenating at least a portion of the first effluent in a second stage to produce a second effluent comprising 850.degree. F.- material and 850.degree. F.+ material;
- recovering from the second effluent a (portion of the) first stream comprising 850.degree. F.- material as product and a second stream comprising a mixture of 850.degree. F.- material and 850.degree. F.+ material;
- and directly employing said mixture, without additional hydrogenation, as at least a portion of the liquefaction solvent used in the coal liquefaction zone.
1 more element
A process for the two-stage liquefaction of coal, comprising:
- contacting coal with a liquefaction solvent in a first stage to produce a first elluent;
- de-ashing the first effluent to produce an essentially ash-free coal liquid;
- separating from the ash-free coal liquid a portion of the 850.degree. F.- material and a feed mixture comprising 850.degree. F.+ material and 850.degree. F.- material;
- hydrogenating the feed mixture in a second stage to produce a second effluent comprising 850.degree. F.- material and 850.degree. F.+ material;
- recovering from the second effluent a (portion of the) first stream comprising 850.degree. F.+ material, as product, and a second stream of a remaining mixture of 850.degree. F.+ material and 850.degree. F.- material;
- and employing the remaining (portion) mixture of the second effluent and the 850.degree. F.- material separated from the ash-free coal liquid, without additional hydrogenation, as the liquefaction solvent for the first stage.
3 more elements
Dependencies are inferred from the claim text.