Process of gas-phase bleaching high consistency finely disintegr

Details Process of gas-phase bleaching high consistency finely disintegr Process of gas-phase bleaching high consistency finely disintegr

1976-04-29

1978-08-08

Fisher, Richard V.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Continuous chemical treatment or continuous charging or...

162 49, 162 52, 162 63, 162 65, D21C 910, D21C 712, D21C 324, D21C 708

Patent

active

041054946

ABSTRACT:
An improved process for gas-phase bleaching of cellulose pulp at high pulp consistency including in series a gas zone space beneath said gas zone for a column of fibrous material, a mixing zone and a dilution zone, wherein a hub body is located centrally at the bottom of the tower and provided with driving means for rotation of the shaft bearing the hub body, and the torque required for rotating the hub body is continuously measured. The rate of dilution liquid is varied inversely with variation in torque thereby maintaining substantially constant the consistency of the diluted fibrous material as withdrawn from the bottom of the tower. The height of the pulp column is measured and kept constant by controlling the withdrawal of diluted fibrous material.

REFERENCES:
patent: 2938824 (1960-05-01), Richter
patent: 3434920 (1969-03-01), Green
patent: 3519532 (1970-07-01), Sutherland
patent: 3579421 (1971-05-01), Richter
patent: 3586600 (1971-06-01), Rich et al.
patent: 3660225 (1972-05-01), Verreyne et al.
patent: 3703435 (1972-11-01), Schleinofer
Engstrom et al., "Advances in Oxygen Bleaching, II" Tappi, Nov. 1971, vol. 54, No. 11.
Fox; "Control Strategy" Tappi, May 1966, vol. 49, No. 5.
Morrison, "Changes in Kraft Continuous Digester Instrumentation," Paper Trade Journal; Sep. 14, 1964, pp. 47-51.

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