Method of affecting the sulphur content and/or sulphur compound

Details Method of affecting the sulphur content and/or sulphur compound Method of affecting the sulphur content and/or sulphur compound

1992-09-08

1996-05-21

Lacey, David L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

162 301, 162 3011, 423DIG3, D21C 1106

Patent

active

055185827

ABSTRACT:
The sulphur content and/or the sulphur compound composition of a melt in a recovery boiler of a pulp mill is adjusted by bringing a gas into contact with the melt. The gas may be a gaseous sulphur compound or a reducing gas. Bringing the gas into contact with the melt increases the sodium sulphide content of the melt while decreasing the sodium carbonate content, so that the sulphidity of the melt increases. The sulphur-containing gas may be produced by pressure heat treatment of black liquor, so that the black liquor burned in the recovery boiler has a lower sulphur content and thereby reduces the boiler sulphur emissions, and boiler corrosion problems.

REFERENCES:
patent: 3867251 (1975-02-01), Holme
patent: 4439272 (1984-03-01), Nguyen
patent: 4526760 (1985-07-01), Empie, Jr.
patent: 4929307 (1990-05-01), Kiiskila et al.

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