D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
8/81
D21C 9/10 (2006.01)
Patent
CA 1245403
13 MECHANICAL PULP PUMPING AND HYDROSULFITE BLEACHING ABSTRACT A medium consistency mechanical pulp (e.g. RMP, CMP, TMP, CTMP or stone groundwood) is treated to effect efficient reductive bleaching. The pulp, at 5-25 percent consistency (preferably 8-15%) is simultaneously pumped and degassed utilizing a fluidizing pump, and by controlling the pump head to maximize deaeration. The pulp may be immediately passed -- without air introduction -- to a fluidizing mixer, where it is mixed with hydrosulfite bleaching chemical. Alternatively, the hydrosulfite may be added directly to the discharge or suction of the pump, and the mixer eliminated. After chemical addition, the pulp is retained at predetermined pH and temperature conditions for a predetermined period of time to effect the desired bleaching.
462873
Goudreau Gage Dubuc
Kamyr Inc.
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