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

1990-11-16

1994-01-11

Manoharan, Virginia

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

159 21, 159 473, 159DIG8, 162 15, 162 49, 162 61, 162 3011, 203 1, 203 2, 203DIG5, 203DIG18, 203 71, B01D 126, D21C 1110

Patent

active

052777596

ABSTRACT:
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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