Continuous cooking with white liquor pretreatment

Details Continuous cooking with white liquor pretreatment Continuous cooking with white liquor pretreatment

D - Textiles, Paper

21

C

D21C 3/24 (2006.01) D21C 1/06 (2006.01) D21C 3/02 (2006.01) D21C 3/26 (2006.01)

Patent

CA 2169108

The pretreatment of cellulosic fibrous material is adjusted to improve pulp strength. The cellulosic material is initially pretreated with a low temperature alkaline liquid (e.g. 80-110°C), and then with a higher temperature (but still below cooking temperature), higher alkali concentration liquor. Only then is the material -- which has alkali which has completely penetrated the cellulose fiber walls -- subjected to cooking with white liquor at a temperature of about 150-180°C. Green, white, or black liquor can be used in the first impregnation zone, while white liquor (with polysulfide addition) is preferably used in the second zone.

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