Sulfate reduction process useful in coal gasification

Details Sulfate reduction process useful in coal gasification Sulfate reduction process useful in coal gasification

1986-05-16

1987-11-03

Richman, Barry S.

Gas: heating and illuminating

Processes

Fuel mixtures

48210, 423415A, 423556, 423DIG14, C10J 300, C01B 1744

Patent

active

047041366

ABSTRACT:
A carbonaceous material, such as coal, is gasified through the catalytic action of an alkali metal salt. The alkali metal is provided as a sulfate which is converted to a sulfide during gasification. In one embodiment, sodium sulfate is converted to sodium sulfide at a temperature effective to form a transitory melt condition at an interface which obtains coal gasification at relatively low temperatures and material residence times for the reaction. An alkaline earth sulfate, such as a gypsum, may be concurrently converted to a sulfide during gasification. The alkali metal sulfide may then be regenerated to a sulfate for process reuse while converting the alkaline earth to a carbonate for environmentally safe disposal with concurrent recovery of valuable sulfur. The evolved carbon gases may be used for fuel, for process feed chemicals, or the like.

REFERENCES:
patent: 616391 (1898-12-01), DeBaranoff et al.
patent: 1492810 (1924-05-01), Rossberg et al.
patent: 1640314 (1927-08-01), Freeman
patent: 1916803 (1933-07-01), Ley et al.
patent: 3640682 (1972-02-01), Smith et al.
White, J. F. M. and White A. A., "Manufacture of Sodium Sulfide", 28 Ind. and Eng. Chem., 244-246 (Feb. 1936).

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