Method of controlling sulfidity of a sulfate cellulose mill

Details Method of controlling sulfidity of a sulfate cellulose mill Method of controlling sulfidity of a sulfate cellulose mill

D - Textiles, Paper

21

C

D21C 11/10 (2006.01) B01D 1/26 (2006.01) D21C 11/00 (2006.01) D21C 11/06 (2006.01)

Patent

CA 2046545

To decrease the sulfur emissions of a sulfate cellulose mill, black liquor is heated before the last effect of the evaporation at a temperature higher than the cooking temperature of the sulfate cook and the sulfidity of white liquor is adjusted by adjusting the temperature and/or retention time of the heat treatment so that a predetermined amount of sulfur compounds are separated from the gaseous black liquor. Preferably, the sulfur containing gas is thereafter divided into different fractions and separately combusted.

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