Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Chemical treatment after start or completion of mechanical...
Patent
1978-12-14
1980-09-02
Smith, William F.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Chemical treatment after start or completion of mechanical...
162 55, 162 60, 162 62, 162 65, 162236, 162252, 162 49, D21C 910
Patent
active
042204984
ABSTRACT:
A method and apparatus for the delignification of cellulosic fiber material to minimize the amount of reject material in the final pulp produced. The fiber material is digested, washed, oxygen delignified, and passed through a screening stage to provide a main pulp stream, and a reject stream from the separation stage. The flow and consistency of the separated reject material is determined, the reject material is refined, and sufficient chemical is added to the separated reject material, based upon the flow and consistency thereof, so that subsequent delignification of the reject material may be effected. This may be accomplished either by passing the reject material through a separate oxygen delignification stage and then returning it to the main pulp stream, or adding caustic to it and soaking it in a soak tank for predetermined period of time, and then returning it to the main pulp stream before the oxygen delignification stage therein.
REFERENCES:
patent: 3830688 (1974-08-01), Mannbro
patent: 3963561 (1976-06-01), Richter
patent: 4000063 (1976-12-01), Laasko
Kleppe et al., Tappi vol. 59, No. 11, pp. 77-80, Nov. 1976.
MacLeod, Tappi vol. 60, No. 2, pp. 128-129, Feb. 1977.
Kamyr Inc.
Smith William F.
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