Process for washing cellulose pulp from alkali digestion

Details Process for washing cellulose pulp from alkali digestion Process for washing cellulose pulp from alkali digestion

D - Textiles, Paper

21

C

9/16

D21C 9/02 (2006.01)

Patent

CA 1070058

ABSTRACT OF THE DISCLOSURE Total washing efficiency in countercurrent washing of cellulose pulp from alkali digestion is increased by lower- ing the pH value in liquid cycles of the washing system to reduce environmental pollution by lowering the pH value of the waste liquor. Foaming of waste liquor is also reduced considerably. The acid wash increases the whiteness of the fibres when lowering the pH value by application of an oxid- izing acid which is of significance in producing unbleached grades.

234520

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