Process for upgrading low rank coal

Details Process for upgrading low rank coal Process for upgrading low rank coal

C - Chemistry, Metallurgy

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C10L 9/08 (2006.01) A61C 1/00 (2006.01) C10F 5/00 (2006.01) C10L 9/00 (2006.01) A63B 22/06 (2006.01)

Patent

CA 1145699

ABSTRACT Low rank coal is subjected to hydrothermal treatment in two stages. In the first stage the coal is heated in the presence of water to a temperature of between 150°C and 300°C at a pressure at least equal to the vapour pressure of water at the temper- ature applied and in the second stage the coal which has been separated from at least part of its liquid water phase is heated to a temperature above 300°C at a pressure below the vapour pressure of water at 300°C. An apparatus for carrying out the process is also described. A high degree or upgrading of low rank coal is achieved without the need of using very high pressures.

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