Method and apparatus for mixing gases with a wood pulp slurry

Details Method and apparatus for mixing gases with a wood pulp slurry Method and apparatus for mixing gases with a wood pulp slurry

1979-06-15

1981-12-01

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With agitation or forced circulation

68 5B, 162 68, 162243, D21C 910, D21D 528

Patent

active

043034705

ABSTRACT:
Process and apparatus for mixing a wood pulp slurry with a chemical at the consistency at which the slurry exits a washer or the subsequent steam mixer, 7 to 15%. The chemicals would include noncondensable or unsaturated gases such as oxygen, ozone, air, chlorine, chlorine dioxide, sulfur dioxide, ammonia, nitrogen, carbon dioxide, hydrogen chloride, nitric oxide or nitrogen peroxide. Highly superheated steam can also be mixed with the pulp.
In the process, the pulp slurry would pass through a mixing zone having a swept area in the range of 10,000 to 1,000,000 square meters per metric ton of oven-dry pulp. The preferred range is 25,000 to 150,000 square meters per metric ton of oven-dry pulp and the optimum is considered to be around 65,400 square meters per metric ton of oven-dry pulp.
The pulp slurry passes through an annular mixing zone. Specific designs of the various elements of the mixer are disclosed.

REFERENCES:
patent: 1827710 (1931-10-01), Leyst-Kuchenmeister
patent: 3293117 (1966-12-01), Pennington
patent: 3769152 (1973-10-01), Samuelson et al.
patent: 4023737 (1976-03-01), Leider et al.
patent: 4039154 (1977-08-01), Peterson
patent: 4082233 (1978-04-01), Reinhall
patent: 4093506 (1978-06-01), Richter
"The Asplund RL 50 S Raffinator Defibrator", Oct. 1971.
"Rauma-Repola Double Shaft Mixer", Bulletin.
Kleppe et al., "Oxygen/alkali delignification at Kamyr digester blowline consistency"-A Status Report TAPPI Nov. 76, vol. 59, No. 11.
Rapson, "The Bleaching of Pulp" TAPPI Monograph No. 27, 1963, p. 332, FIGS. 15-22.

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