Production of cellulose pulp bleaching chemicals

Details Production of cellulose pulp bleaching chemicals Production of cellulose pulp bleaching chemicals

C - Chemistry, Metallurgy

01

B

C01B 15/023 (2006.01) C01B 3/22 (2006.01) D21C 9/16 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2098062

ABSTRACT Hydrogen peroxide for cellulose pulp bleaching is pro- duced directly at a pulp mill without electrolysis. Hy- drogen is produced from black liquor from the pulp mill pulping process, and that hydrogen is then reacted (e.g. with oxygen and anthraquinone) to produce hydrogen perox- ide, which is in turn used to bleach pulp in a P stage directly on site. The hydrogen is produced from the black liquor by heat treatment to produce an off-gas containing DMS, and other hydrocarbons. Hydrogen can be produced from the off gas in a number of ways, including by react- ing it with a melt in a recovery boiler, or ash from a recovery boiler.

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