D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 11/04 (2006.01) C01B 17/22 (2006.01) C01B 17/28 (2006.01) D21C 11/00 (2006.01) D21C 11/06 (2006.01)
Patent
CA 2078934
ABSTRACT OF THE DISCLOSURE 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 hydrocarbon containing gas 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.
Henricson Kaj
Klarin Anja
Ahlstrom (a.) Corporation
Gowling Lafleur Henderson Llp
Henricson Kaj
Klarin Anja
LandOfFree
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