Bleaching paper pulp with modified silicate ion exchanger and hy

Details Bleaching paper pulp with modified silicate ion exchanger and hy Bleaching paper pulp with modified silicate ion exchanger and hy

1990-05-23

1991-08-13

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 80, 8111, D21C 916

Patent

active

050393774

ABSTRACT:
A method for bleaching pulp using an alkaline, peroxide-containing bleaching agent for chemical pulp, mechanical pulp, waste paper and/or mixtures thereof, which optionally contains water glass and/or a complexing agent, contains, as an additive, a silicate ion exchanger which has been modified using an alkali metal carbonate or alkali metal hydrogen carbonate.

REFERENCES:
patent: 3650887 (1972-03-01), Grangaard
patent: 4623357 (1986-11-01), Urban
patent: 4751023 (1988-06-01), Stehlin et al.
Ali et al. "The Role of Silicate in Peroxide Brightening of Mechanical Pulp" Journal of Pulp & Paper Science vol. 12, No. 6, Nov. 1986.

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