Abstract: Coal or similar carbonaceous solids are extracted by contacting the solids in an extraction zone (12) with an aqueous solution having a pH above 12.0 at a temperature between 65.degree. C. and 110.degree. C. for a period of time sufficient to remove bitumens from the coal into said aqueous solution and the extracted solids are then gasified at an elevated pressure and temperature in a fluidized bed gasification zone (60) wherein the density of the fluidized bed is maintained at a value above 160 kg/m.sup.3. In a preferred embodiment of the invention, water is removed from the aqueous solution in order to redeposit the extracted bitumens onto the solids prior to the gasification step.
Type:
Grant
Filed:
July 6, 1984
Date of Patent:
August 5, 1986
Assignee:
The United States of America as represented by the United States Department of Energy
Inventors:
Dolores C. Aquino, Philip L. DaPrato, Toby R. Gouker, Peter Knoer