C - Chemistry – Metallurgy – 10 – L
Patent
C - Chemistry, Metallurgy
10
L
196/11
C10L 5/00 (2006.01) C10J 3/00 (2006.01) C10L 9/02 (2006.01)
Patent
CA 1069450
TREATING SOLID FUEL ABSTRACT A method of treating fine particles of solid carbonaceous fuel of the coal or coke type that comprises mixing the fuel particles with a liquid aqueous solution comprising essentially (a) sodium, potassium, or lithium hydroxide together with (b) calcium, magnesium, or barium hydroxide or carbonate, or a plurality thereof, with a ratio of (a) to the fuel of about 0.04 to 0.70 (typically 0.10 to 0.35) by weight, a ratio of (b) to the fuel of about 0.02 to 0.30 (typically 0.08 to 0.20) by weight, and a ratio of water to the fuel of about 1 to 10 (typically 2 to 5) by weight; heating the resulting mixture, at an elevated pressure, to a temperature of about 150 to 375° C (typically 175 to 300° C) in such a manner as to improve the usefulness of the fuel particles; and cooling to below about 100° C. The cooled mixture either is dried or filtered to separate the fuel particles from the solution, the particles then being washed and dried. The filtered solution is regenerated so that it can be again mixed with unreacted fuel particles. The solution typically comprises essentially sodium hydroxide and calcium hydroxide or carbonate, and may comprise also magnesium hydroxide or carbonate. A substantially continuous treatment comprises the steps of (a) continuously introducing the fuel particles at a preselected rate into the liquid aqueous solution to form a slurry, (b) moving the slurry through a region maintained at the elevated pressure and temperature, (c) moving the slurry outside the region of step (b) and separating the easily removable liquid phase from the solid fuel particles, (d) moving the fuel particles away from the separated liquid phase, and washing the particles. Typically the separated liquid phase is regenerated by removing any impurities therefrom and is recycled as the liquid aqueous solution in the continuous process.
248535
Chauhan Satya P.
Stambaugh Edgel P.
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