HYDROGENATION OF UNDISSOLVED COAL AND SUBSEQUENT LIQUEFACTION OF HYDROGENATED COAL

摘要

HYDROGENATION OF UNDISSOLVED COAL AND SUBSEQUENT LIQUEFACTION OF HYDROGENATED COAL A staged process for hydrogenation of undissolved coal and subsequent liquefaction of the hydrogenated coal to provide useful hydrocarbon liquid products including naphtha, gasoline and diesel fuels. These low boiling hydrocarbon liquids are produced by the process comprising: (a) mixing solid coal particles with a hydrocarbon solvent oil in a solvent/coal ratio ranging from about 8/1 to about 1.5/1 to provide a flowable coal/oil slurry; (b) passing said coal/oil slurry and hydrogen upwardly through a first stage reaction zone containing a coal-derived liquid in a catalytic bed of particulate; catalyst maintained at a temperature ranging from about 400.degree. to about 700.degree.F and a hydrogen partial pressure of 100 to 2000 psig for a residence time sufficient to hydrogenate the solid coal particles; and (c) withdrawing the coal/oil slurry containing the hydrogenated coal particles from the first reaction zone and passing the coal/oil slurry to a second stage reaction zone containing a catalytic bed maintained at a temperature of between about 700.degree. and about 850.degree.F and a hydrogen partial pressure of 100 to 2000 psig to liquefy and convert the coal to useful hydrocarbon liquid fuel products. The first and second stage reaction zones may contain the same or different catalysts such as Co/Mo on a porous substrate such as alumina or silica. The process preferably uses a coal-derived slurrying oil and first stage temperature of 550-650.degree.F. and second stage temperature of 800-825.degree.F.