D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/56
D21C 7/00 (2006.01) D21C 1/00 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1332526
A process for the continuous digestion of cellulosic fiber mate- rial is described wherein the material is impregnated with liquid in a closed system comprising a concurrent flow zone and a coun- tercurrent flow zone, the liquid in the concurrent flow zone in- cluding black liquor and possibly white liquor and the liquid in the countercurrent flow zone including white liquor. Liquid is withdrawn from the impregnation system at a point located between the concurrent flow zone and the countercurrent flow zone. Besides white liquor a predetermined amount of black liquor is added to the countercurrent flow zone in order to obtain a high liquid to wood ratio in the inlet of the digester.
614211
Fetherstonhaugh & Co.
Metso Fiber Karlstad Ab
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