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US 4,283,268 AGranted
Two-stage coal liquefaction process with interstage guard bed
AssigneeChevron Research Company
InventorsJoel W. Rosenthal, Christopher W. Kuehler
Life of this patent
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Abstract
An improved coal liquefaction process is disclosed wherein subdivided coal is substantially dissolved in a process-derived solvent in the presence of added hydrogen, thereby forming a mixture of dissolved coal, solvent and insoluble solids, and said mixture is passed through a guard bed of solid porous contact material, such as alumina, in the presence of hydrogen, to deposit titanium, iron and calcium from the mixture prior to hydrocracking.
Claims9
A process for the liquefaction of coal comprising the steps of
- (a) substantially dissolving subdivided coal in a dissolving stage with a solvent in the presence of hydrogen at a temperature in the range of about 400.degree. C. to 480.degree. C. and a pressure of about 35 to 680 atmospheres to form a first effluent mixture containing solvent, dissolved coal, and insoluble solids;
- (b) passing solvent, dissolved coal and the insoluble solids from said first effluent mixture with hydrogen through a guard bed of solid porous contact material to substantially reduce the metals content of said first effluent by hydrogenation, to provide a second effluent containing solvent, dissolved coal, and insoluble solids;
- (c) passing a slurry containing solvent, dissolved coal and the insoluble solids from said second effluent to a hydrocracking stage containing hydrocracking catalyst and operating under hydrocracking conditions, including a temperature in the range of about 340.degree. to 425.degree. C., a pressure in the range of about 35 to 680 atmospheres and a hydrogen rate of 355 to 3550 liters per liter of slurry.
Dependencies are inferred from the claim text.