Pulp cooking with particular alkali profiles

Details Pulp cooking with particular alkali profiles Pulp cooking with particular alkali profiles

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) D21C 3/26 (2006.01) D21C 7/10 (2006.01) D21C 7/14 (2006.01)

Patent

CA 2282094

Yield, particularly when treating hardwood chips, can be improved by at least 1-2% in a kraft cellulose pulping process by keeping the temperature and effective alkali (EA) low during impregnation, and by keeping the EA low in at least a first cook stage. After cooking, the pulp is subjected to cooling low EA liquor, e.g. to reduce its temperature to below 120°C (preferably below 100°C) with an EA below about 5 g/L (expressed as NaOH). Continuous treatment in a continuous digester system is preferred, with the EA below about 20 g/L during impregnation and the first cook.

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