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US 4,379,744 AGranted
Coal liquefaction process
AssigneeChevron Research Company
InventorsJoel W. Rosenthal, Arthur J. Dahlberg
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AssigneeChevron Research Company
InventorsJoel W. Rosenthal, Arthur J. Dahlberg
Estimating the term…
This invention is a process for liquefying coal in at least two stages, comprising (a) heating a slurry comprising a solid particulate coal, and an externally supplied dispersed dissolution catalyst in the presence of hydrogen in a first reaction zone to substantially dissolve the coal and provide a first effluent slurry having a normally liquid portion comprising solvent and dissolved coal and containing undissolved solids and dispersed dissolution catalyst; and (b) contacting at least a portion of said normally liquid portion containing undissolved solids and dispersed dissolution catalyst with hydrogen in a second reaction zone in the presence of a second externally supplied hydrogenation catalyst under hydrogenation conditions, including a temperature lower than the temperature to which said slurry is heated in step (a), to produce a second effluent slurry having a normally liquid portion. Preferably, the dispersed dissolution catalyst in the first hydrogenation zone is added as an emulsion of aqueous soluble compounds of transition elements, e.g. from Groups IV-B, V-B, VI-B or Group VIII of the Periodic Table.
A process for liquefying coal which comprises:
A process for liquefying coal which comprises:
A process for liquefying coal which comprises:
Dependencies are inferred from the claim text.