Process for minimizing discolouration in pulping systems

Details Process for minimizing discolouration in pulping systems Process for minimizing discolouration in pulping systems

D - Textiles, Paper

21

C

9/16.5

D21C 9/147 (2006.01) D21C 9/00 (2006.01) D21F 1/66 (2006.01)

Patent

CA 1200353

ABSTRACT OF THE DISCLOSURE A process is provided for the reduction of the dark colouring of paper pulp in white water systems. The process involves adding oxygen, or oxygen-containing gases to the whitewater system of the pulping system. The oxygen is added in such an amount that aerobic conditions are maintained substantially permanently in at least a part of the whitewater system, and where the redox potential is higher than -100mV. This seems to prevent anaerobic bacteria from forming metal sulfides on the pulp.

411729

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