Coal-water mixture using upgraded low-rank coal and process for

Details Coal-water mixture using upgraded low-rank coal and process for Coal-water mixture using upgraded low-rank coal and process for

1992-06-24

1994-03-01

Howard, Jacqueline V.

Fuel and related compositions

Solid carbonaceous fuel dispersed in a liquid medium

44592, 44608, 44620, C10L 132

Patent

active

052903249

ABSTRACT:
The present invention provides a process for producing a coal-water mixture using a reaction mixture obtained by subjecting a low-rank coal of high water content to a hydrothermal treatment in the presence of carbon monoxide and water at a temperature not higher than the critical temperature of water. The above hydrothermal treatment makes the walls of pores present in the coal hydrophobic and densifies the coal matrix, whereby the coal after the treatment has a lower equilibrium moisture content. Hence, it becomes possible to produce a coal-water mixture containing a high concentration of coal and having good stability and fluidity, from a low-rank coal of high water content which has been unusable as a material for a coal-water mixture. Further, in the production of a coal-water mixture from the above reaction mixture, the amount of surfactant used can be reduced because the liquid phase of the reaction mixture contains a large amount of humic acid having surface activity.

REFERENCES:
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patent: 4436528 (1984-03-01), Schick et al.
patent: 4783198 (1988-11-01), Hueschen
patent: 4904277 (1990-02-01), Najjar et al.
Fukuhara et al., "The Up-Grading of Low Rank Coals By Hydrothermal Treatment"; Papers For 27th Annual Conf. of Coal Science (1990), The Fuel Society Corp. (Nov. 29-30, 1990) Tokyo pp. 218-221.
Japanese Industrial Standard (JIS), M8812, 1984 pp. 1-25.
Roggoni, T. C. et al., International H. Minning and Eng., 2, (1984) pp. 157-169.
Potas, T. A., et al, Chem. Eng Commun., vol. 44, 1986 pp. 141-151.
Yokoyama et al., Journal of The Fuel Society of Japan 57 (1977) pp. 182-189.
Takemura et al., Fuel, vol. 60, (May 1981), pp. 379-384.

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