Bleaching procedure using chlorine dioxide and chlorine solution

Details Bleaching procedure using chlorine dioxide and chlorine solution Bleaching procedure using chlorine dioxide and chlorine solution

1982-03-22

1983-10-11

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

423478, 423506, C01B 1102, D21C 914

Patent

active

044090668

ABSTRACT:
The adverse effects of dissolved organic material in the aqueous phase of pulp suspensions during bleaching using mixtures of chlorine dioxide and chlorine are overcome by applying the chlorine dioxide and chlorine serially to the pulp in two steps without an intermediate wash. An aqueous solution of chlorine dioxide and chlorine in which the chlorine constitutes from about 6 to about 10% of the total available chlorine of the solution is used in the first step and chlorine is used in the second step. The aqueous solutions are formed by dissolving in water chlorine dioxide and chlorine formed in a chlorine dioxide generator.

REFERENCES:
patent: Re28884 (1976-06-01), Jack et al.
patent: 3864456 (1975-02-01), Winfield
patent: 4086329 (1978-04-01), Cowley et al.
patent: 4299653 (1981-11-01), Reeve
patent: 4325783 (1982-04-01), Reeve et al.

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