Coal liquefaction process

Details Coal liquefaction process Coal liquefaction process

C - Chemistry, Metallurgy

10

G

196/5.2

C10G 1/08 (2006.01) C10G 1/00 (2006.01)

Patent

CA 1191803

ABSTRACT OF THE DISCLOSURE "COAL LIQUEFACTION PROCESS" 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 dissolu- tion 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.

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