D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/60.1, 8/78.1
D21C 9/10 (2006.01)
Patent
CA 1114561
ABSTRACT OF THE DISCLOSURE A method and apparatus for continuous oxygen bleaching of cellulosic pulp is provided utilizing first and second pressurized chambers with a number of tubes in fluid communi- cation with both of first and second chambers. Oxygen bearing fluid is intimately mixed with digested cellulosic pulp and is continuously fed under pressure to the first chamber. Communi- cation is selectively provided between the first and second chambers through at least one of the tubular members to allow passage of pulp from the member to the second chamber. The tubular member through which pulp flows to the second chamber is progressively changed as are the members through which passage is blocked, so that the pulp remains within each tubular member sufficient time to allow oxygen-bleaching thereof without degra- dation, and passes through the members without channelling. The oxygen bleached pulp is continuously discharged from the second chamber. The passage of pulp through the tubular members may either be downwardly or upwardly. The passage between the blocked tubular members and the second chamber is blocked in the first chamber by a rotating plate, the plate having an aperture rotated into communication with each member in turn, the members disposed in a circle.
310984
Goudreau Gage & Associates
Kamyr Inc.
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