D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 11/12 (2006.01) D21C 3/26 (2006.01) D21C 11/00 (2006.01) D21C 11/04 (2006.01)
Patent
CA 2077216
Chemicals are recovered during the production of cellulose pulp by forming two different sulfidity melts in two different sections of a recovery boiler, and then producing cooking liquors from different melts in dissolving tanks. The liquors may be causticized and/or oxidized, or may be utilized uncausticized. Uncausticized green liquor having a sulfidity of about 70-90% may be used early in a kraft cooking cycle, followed by treatment with low sulfidity oxidized and causticized white liquor. In the continuous digestion of cellulosic pulp, oxygen may be added to the recirculation loops below the black liquor withdrawal to enhance the alkalinity of the slurry and to assist in delignification. Oxidized cooking liquor with low sulfidity can be added to oxygen bleaching and alkali extraction stages downstream of the digester, and a portion of the high sulfidity cooking liquor can be used to produce acid used in an ozone bleaching stage.
Ahlstrom Machinery Oy
Gowling Lafleur Henderson Llp
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