Method of treating material containing sodium sulphate and/or so

Details Method of treating material containing sodium sulphate and/or so Method of treating material containing sodium sulphate and/or so

1992-09-11

1994-07-12

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 29, 162 3011, 4234151, D21C 1104

Patent

active

053285638

ABSTRACT:
Sodium sulphate and/or sodium carbonate containing material from a cellulose pulp mill, such as fly ash from a recovery boiler, or a by-product from a chlorine dioxide production plant, is brought into contact with a a gas containing hydrocarbons and/or hydrogen sulphide which chemically reacts with the material to produce sodium sulphide. Preferably the gas contains one or both of ethene and hydrogen sulphide. The sodium sulphide produced is used to effect sulphate cooking of cellulose pulp. The gas may be brought into contact with the melt of a soda recovery boiler to increase its sulphidity, either prior to, after, or simultaneously with bringing the gas into contact with the material. The sources of the fly ash and melt may be a soda recovery boiler combusting black liquor under oxidizing conditions.

REFERENCES:
patent: 2106952 (1938-02-01), Konig
patent: 2711430 (1955-06-01), Hagglund
patent: 3236589 (1966-02-01), Reinhall
patent: 3322492 (1967-05-01), Flood
patent: 3762989 (1973-10-01), Timpe
patent: 3867251 (1975-02-01), Holme
patent: 4439272 (1984-03-01), Nguyen
"Lignins", Wiley Interscience, 1971, pp. 806-817, 828.

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