Enhanced dithionite bleaching

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical


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162 75, 162 76, 162160, D21C 912




Compositions and a method are disclosed for minimizing brightness reversion of chromophore-containing wood pulps, especially low-cellulose wood pulps, such as groundwood and thermomechanical pulps, which have been reductively bleached or bleached with hydrogen peroxide. Ascorbic acid and palmitoyl ascorbate are particularly effective for preventing such reversion at low levels.

patent: 2070585 (1937-02-01), Dreyfus
patent: 4238282 (1980-12-01), Hyde
patent: 4504576 (1985-03-01), Kemme


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