Calcium impregnation of coal enriched in CO.sub.2 using high-pre

Details Calcium impregnation of coal enriched in CO.sub.2 using high-pre Calcium impregnation of coal enriched in CO.sub.2 using high-pre

1989-02-13

1990-10-23

Dees, Carl F.

Fuel and related compositions

Coal treating process or product thereof

44604, C10L 902

Patent

active

049648810

ABSTRACT:
Methods are described for impregnating coal with calcium carbonate by utilizing an aqueous phase ionic reaction between calcium acetate, calcium hydroxide, and water with CO.sub.2 contained within the coal. The coal is enriched in CO.sub.2 by contacting it with CO.sub.2 at high pressure, in either a continuous or pulsed mode. The inclusion of CO.sub.2 in the coal during the process does not involve evacuating the coal and subsequently absorbing CO.sub.2 onto the coal as in prior methods. Rather, the coal is treated with carbon dioxide at high pressure in a practical and viable approach. The impregnation of coal by calcium compounds not only reduces sulfur emissions by effectively tying up the sulfur as calcium sulfide or sulfate, but also increases the gasification or combustion rate. The invention also encompasses the use of other Group IIA elements, as well as the coal products resulting from the methods of treatment described.

REFERENCES:
patent: 4204843 (1980-05-01), Neavel
patent: 4280817 (1981-07-01), Chauhan et al.
patent: 4468231 (1984-08-01), Bartok et al.
patent: 4522626 (1985-06-01), Espenscheid
"Sulfur Retention . . . . " by Freund et al. 9/81.
"Sulfur Retention of Calcium-Containing Coal . . . " by Freund et al. 1982.
Chang "Fuel", vol. 65, p. 75--86.
"Calcium Pretreatment of Coal" by Sharma et al., 2/87.

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