D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/60.1
D21C 9/10 (2006.01)
Patent
CA 1063409
ABSTRACT OF THE DISCLOSURE Oxygen bleaching of high consistency pulp takes place in an oxygen reactor. Pulp is mixed with oxygen, and emulsified in a defibrator, and then is transported under pres- sure to the bottom inlet of an oxygen reactor. The pulp moves upwardly in an inner, concentric sub-vessel of the oxygen reac- tor and caustic may be inserted into the pulp while moving up- wardly in the inner sub-vessel. At the top of the sub-vessel the pulp is dispensed by a scraper, which prevents channeling, over the edge of the sub-vessel and into the outer chamber sur- rounding the inner sub-vessel. A top portion of the outer chamber, above the sub-vessel, contains pressurized gas, and the concentration of explosive gases in the top portion is sensed, and the gases are exhausted from the top portion and replaced by compressed air (or a similar non-explosive rela- tively inexpensive gas) when the concentration of explosive gases exceeds a predetermined amount.
283705
Backland Ake
Kleppe Peder J.
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