Process for the conversion of coal and gypsum to valuable produc

Details Process for the conversion of coal and gypsum to valuable produc Process for the conversion of coal and gypsum to valuable produc

1986-12-10

1988-05-17

Sneed, Helen M. S.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423168, 423171, 423172, 423542, 423555, 201 12, 201 15, 201 16, 201 21, 201 25, 106109, 48197R, 48210, C01B 1750

Patent

active

047449691

ABSTRACT:
The present invention relates to the coproduction of a combustible feed gas stream useable as an energy source and a sulfur-containing second gas stream useable as a feedstock for the production of sulfuric acid. The process includes heating coal in the presence of an oxygen-lean atmosphere under partial coal gasifying conditions to produce a solid carbonaceous char and a crude coal-gas stream. Sulfur-containing compounds are removed from the coal gas stream and converted to solid sulfur-containing materials. The solid sulfur-containing materials are combined with the solid carbonaceous char and gypsum to form a feed mixture. The non-gypsum portion of the feed mixture contains sufficient reducing potential to release substantially all of the sulfur in the gypsum as gaseous compounds of sulfur in a +4 or lower oxidation state. The feed mixture is heated under reducing conditions to produce a sulfur-containing second gas stream and a solid sintered product.

REFERENCES:
patent: 3717700 (1973-02-01), Robinson et al.
patent: 3729551 (1973-04-01), Gorin
patent: 4102989 (1978-07-01), Wheelock
patent: 4197285 (1980-04-01), Yang et al.
patent: 4503018 (1985-03-01), Gardner et al.
patent: 4508544 (1985-04-01), Moss

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