Upgrading process for inert rich oxidized coal

Details Upgrading process for inert rich oxidized coal Upgrading process for inert rich oxidized coal

C - Chemistry, Metallurgy

10

L

196/5.9

C10L 9/02 (2006.01) C10L 9/00 (2006.01)

Patent

CA 1232219

- 1 - Abstract: A process for upgrading low quality, highly oxidized coals to make them more suitable for carbonization, combination or liquefaction. The process comprises reducing (e.g. grinding) the coal to a particle size of 60 mesh (about 250µ ) or less, feeding the resulting pulverized coal to a reactor, contacting the coal with water or steam and with carbon monoxide or synthesis gas (CO + H2), heating the reactor contents to bring about upgrading and then cooling the reactor and removing the coal. The reaction temperature must be about 50°C + 5°C below the softening temperature of the coal as measured by a Ruhr dilatometer and the reaction should be allowed to proceed at that temperature for 45-55 minutes. The initial gas pressure should be 1500 + 100 psi (10.3 + 0.7 MPa) at 25°C. Finally, the amount of water or steam relative to the coal should be at least 0.2:1 by weight. When these reaction conditions are followed, a coal having significantly improved combustion, coking or liquefaction properties can be obtained.

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