Filtering coal-derived oil through a filter media precoated with particles partially solubilized by said oil
AssigneeThe United States of America as represented by the United States Energy Research and Development Administration
InventorsBilly R. Rodgers, Michael S. Edwards
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Abstract
Solids such as char, ash, and refractory organic compounds are removed from coal-derived liquids from coal liquefaction processes by the pressure precoat filtration method using particles of 85-350 mesh material selected from the group of bituminous coal, anthracite coal, lignite, and devolatilized coals as precoat materials and as body feed to the unfiltered coal-derived liquid.
Claims7
A method for separating solids such as char, ash, and refractory organic compounds from a viscous slurry comprising tars, asphaltenes, and up to 25 wt.% of said solids including ash particles smaller than 1 micron, said method comprising the steps of:
- a. forming a layer of partially solubilized 85-350 mesh particles of anthracite coal, bituminous coal, lignite, devolatilized anthracite coal, devolatilized bituminous coal, or devolatilized lignite on a filter media;
- b. filtering said viscous slurry through said layer and said media at a differential pressure of about 0.1-10 atmosphere across said media and said layer so as to recover a liquid containing less than 0.15 wt.% ash.
Dependencies are inferred from the claim text.