Apparatus for delignifying and bleaching cellulose pulp

Details Apparatus for delignifying and bleaching cellulose pulp Apparatus for delignifying and bleaching cellulose pulp

1976-06-11

1979-12-04

Bashore, S. Leon

Paper making and fiber liberation

Apparatus

Digester

162 44, 162 65, 162248, D21C 712

Patent

active

041771052

ABSTRACT:
In an apparatus for treating cellulose pulp with oxygen gas by passing the pulp and oxygen gas through a reaction vessel at elevated temperature and pressure, the improvement whereby the exothermic heat of reaction is controlled and the temperature of the pulp being treated is maintained below the point where the pulp would be degraded, the improvement comprising means for withdrawing oxygen gas from the vessel after the gas has been in contact with the pulp, dividing the withdrawn gas into two portions, cooling one of the portions to remove water vapor therefrom, recombining the gas portions whereby the resulting gas has a lower temperature than the gas withdrawn from the vessel and returning the resulting gas to the vessel for further contact with pulp therein, the amount of gas withdrawn from the vessel and the degree of cooling of the cooled portion of withdrawn gas being regulated to maintain the temperature within the vessel below the point where the pulp is degraded.

REFERENCES:
patent: 396325 (1889-01-01), Brin
patent: 1457326 (1923-06-01), Tompkins
patent: 2313052 (1943-03-01), Dean
patent: 3298900 (1967-01-01), Laakso
patent: 3441475 (1969-04-01), Tomlinson
patent: 3654070 (1972-04-01), Prodt et al.
patent: 3660225 (1972-05-01), Verreyne
Ogden, "Heat Recovery from Digester, Blowdown and . . . ", Tappi, vol. 121, No. 11 (Sep. 13, 1945), pp. 107-110; 162-47.

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