United States Patent: 8465561
Not long ago, as accessible via:
West Virginia Coal Association | WVU May 28, 2013, Carbon-recycling Coal Liquefaction | Research & Development;
we made report to you of:
"United States Patent 8,449,632 - Sewage Material in Coal Liquefaction; May 28, 2013; Inventor: Alfred H. Stiller, Morgantown, WV; Assignee: West Virginia University; Abstract: The present disclosure provides methods and systems for coal liquefaction using a sewage material. A method of obtaining a de-ashed coal extract includes exposing a coal to a sewage material in the presence of a coal-derived solvent to form a slurry, elevating the temperature of the slurry to facilitate liquefying the coal and liberating a volatile matter, and separating the insoluble components from the slurry to obtain a de-ashed coal extract, wherein the coal extract is suitable for downstream processing. The method ... wherein the coal-derived solvent is selected from a group comprising recycled liquefied coal, coal tar distillate, and coal tar pitch. Tetralin has been used as a donor solvent. However, a large overpressure of hydrogen and high temperature is needed to transfer the hydrogen from the gas phase to naphthalene, which is produced when tetralin is dehydrogenated as it transfers hydrogen to coal molecules. Thus, in situ re-hydrogenation during liquefaction can be rather costly.In an aspect, the present invention provides methods and systems for inexpensively producing an effective solvent to digest coal. Alternatively, the methods and systems may enhance the dissolution ability of heavy aromatic oils by the addition of a hydrogenated liquid. In an embodiment, the hydrogenated liquid may be partially or fully hydrogenated vegetable oil";