Treating pulp with oxygen

Details Treating pulp with oxygen Treating pulp with oxygen

D - Textiles, Paper

21

C

92/60.1, 8/78.1

D21C 9/10 (2006.01)

Patent

CA 1134560

P 74 4687 TREATING PULP WITH OXYGEN ABSTRACT OF THE DISCLOSURE A wood pulp slurry is treated with oxygen in a mill with little change to the process or structure of the mill. No special pressure tanks are required. The consistency of the pulp need not be altered for the usual consistency of the pulp leaving a washer or subse- quent steam mixer without additional dewatering of addi- tional dilution. The oxygen is added into a closed section of the system so that it cannot immediately vent to the atmos- phere. Alkali should also be present when the oxygen is mixed with the slurry. The mixing should occur near to the point of oxygen addition. An existing extraction stage within the system may be used as a source of alkali. In an existing extrac- tion stage, the mixer (211) and upstream oxygen line (212) would be placed in the line between the stream mixer (206?) and the extraction tower (213?). The mixing occurs in a relatively small mixer (550) that intensively mixes the slurry and the gas. The mixer (550) has a mixing zone with a swept area of 10,000 to 1,000,000 square meters per metric ton of oven- dry pulp. A preferred range is 25,000 to 150,000 square meters per metric ton of oven-dry pulp and an optimum range of around 65,400 square meters per metric ton of oven-dry pulp. Specific mixer designs are disclosed.

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