Gasification of black liquor

Details Gasification of black liquor Gasification of black liquor

1985-09-23

1987-07-28

Kratz, Peter

Gas: heating and illuminating

Processes

Fuel mixtures

48203, 48209, 162 3011, 423207, 423DIG3, C10J 300

Patent

active

046829857

ABSTRACT:
A concentrated aqueous black liquor containing carbonaceous material and alkali metal sulfur compounds is treated in a gasifier vessel containing a relatively shallow molten salt pool at its bottom to form a combustible gas and a sulfide-rich melt. The gasifier vessel, which is preferably pressurized, has a black liquor drying zone at its upper part, a black liquor solids gasification zone located below the drying zone, and a molten salt sulfur reduction zone which comprises the molten salt pool. A first portion of an oxygen-containing gas is introduced into the gas space in the gasification zone immediatley above the molten salt pool. The remainder of the oxygen-containing gas is introduced into the molten salt pool in an amount sufficient to cause gasification of carbonaceous material entering the pool from the gasification zone but not sufficient to create oxidizing conditions in the pool. The total amount of the oxygen-containing gas introduced both above the pool and into the pool constitutes between 25 and 55% of the amount required for complete combustion of the black liquor feed. A combustible gas is withdrawn from an upper portion of the drying zone, and a melt in which the sulfur content is predominantly in the form of alkali metal sulfide is withdrawn from the molten salt sulfur reduction zone.

REFERENCES:
patent: 1808773 (1931-06-01), Grondona
patent: 1931536 (1933-10-01), Goodell
patent: 2056266 (1936-10-01), Goodell
patent: 2182428 (1939-12-01), Fladmark
patent: 3639111 (1972-02-01), Brink et al.
patent: 3718446 (1973-02-01), Brink et al.
patent: 3916617 (1975-11-01), McKenzie et al.
patent: 4441959 (1984-04-01), Empie, Jr.

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