초록 ▼

Metal constituents are recovered from the heavy bottoms produced during the liquefaction of coal and similar carbonaceous solids in the presence of a catalyst containing a metal capable of forming an acidic oxide by burning the heavy bottoms in a combustion zone at a temperature below the fusion tem

Metal constituents are recovered from the heavy bottoms produced during the liquefaction of coal and similar carbonaceous solids in the presence of a catalyst containing a metal capable of forming an acidic oxide by burning the heavy bottoms in a combustion zone at a temperature below the fusion temperature of the ash to convert insoluble metal-containing catalyst residues in the bottoms into soluble metal-containing oxides; contacting the oxidized solids formed in the combustion zone with an aqueous solution of a basic alkali metal salt to extract the soluble metal-containing oxides in the form of soluble alkali metal salts of the metal-containing oxides and recycling the soluble alkali metal salts to the liquefaction zone. In a preferred embodiment of the invention, the bottoms are subjected to partial oxidation, pyrolysis, coking, gasification, extraction or a similar treatment process to recover hydrocarbon liquids and/or gases prior to the burning or combustion step.

대표청구항 ▼

A process for the liquefaction of coal which comprises: (a) contacting said coal under liquefaction conditions in a liquefaction zone with a hydrogen-containing gas and/or an added hydrocarbon solvent in the presence of a catalyst containing a metal capable of forming an acidic oxide to produce a li

A process for the liquefaction of coal which comprises: (a) contacting said coal under liquefaction conditions in a liquefaction zone with a hydrogen-containing gas and/or an added hydrocarbon solvent in the presence of a catalyst containing a metal capable of forming an acidic oxide to produce a liquefaction effluent, wherein said metal salt is introduced into said liquefaction zone in the form of a water-soluble or oil-soluble compound or by impregnation onto said coal; (b) treating said liquefaction effluent to recover hydrocarbon liquids thereby producing a heavy bottoms containing carbonaceous material comprised of high molecular weight hydrocarbon liquids boiling above about 1000°F. and unconverted carbonaceous solids, insoluble catalyst residues containing said metal, and ash; (c) burning said heavy bottoms in a combustion zone at a temperature below the fusion temperature of said ash to convert the insoluble metal-containing catalyst residues into soluble metal-containing oxides; (d) withdrawing oxidized solids containing said soluble metal-containing oxides from said combustion zone; (e) contacting said oxidized solids with an aqueous solution of a basic alkali metal salt thereby extracting said soluble metal-containing oxides from said oxidized solids in the form of soluble alkali metal salts of said metal-containing oxides; and (f) recycling said soluble alkali metal salts of said metal-containing oxides to said liquefaction zone wherein said metal is reused as constituents of said catalyst.