Extended kraft cooking with white liquor added to wash...

Details Extended kraft cooking with white liquor added to wash... Extended kraft cooking with white liquor added to wash...

D - Textiles, Paper

21

C

9/17, 92/57.1

D21C 3/02 (2006.01) D21C 3/24 (2006.01) D21C 7/00 (2006.01) D21C 7/14 (2006.01) D21C 9/147 (2006.01) D21C 9/153 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2037717

In the continuous kraft pulping of comminuted cellulosic fibrous material (e.g. wood chips) to produce paper pulp, viscosity for a given Kappa Number is significantly increased (e.g. at least about 20%) by adding kraft white liquor to the wash recirculation loop in a continuous digester. Optimum results are obtained when kraft white liquor is also added to a recirculation loop at a central portion of the digester, so that the majority of the digester has countercurrent flow between white liquor and cellulosic material. About 5-20% of the total white liquor necessary to effect kraft cooking is introduced in the wash circulation, and about 10-20% is introduced into the central portion recirculation. The temperature in the wash zone is maintained at about 140-175°C.

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