Process for chlorine bleaching of kraft pulp using a sulfite ext

Details Process for chlorine bleaching of kraft pulp using a sulfite ext Process for chlorine bleaching of kraft pulp using a sulfite ext

1985-05-14

1986-04-01

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 86, 162 88, 162 89, D21C 912, D21C 914

Patent

active

045796289

ABSTRACT:
Extraction of chlorine bleached kraft wood pulps with aqueous peracids at pH values of 7 or below, aqueous sulfites at pH values below 10 or with certain non-aqueous solvents provides extracted pulps having lower residual color and permits use of lesser quantities of alkali or chlorine dioxide in subsequent bleach steps to attain brightness and strength levels comparable to those attained with pulps treated by alkaline extraction at pH values of 10 or higher. At a comparable level of alkali and chlorine dioxide or hypochlorite application, extraction of chlorinated pulp with peracids provides bleached pulps with enhanced brightness.

REFERENCES:
Histed; Pulp and Paper Canada; "Bleachery Simplification in CIP"; vol. 81, No. 11, pp. 54-58, 11-1980.
Richter; TAPPI, vol. 38, No. 3, "Production of High Alpha-Cellulose Wood Pulps and Their Properties", 3-1955, pp. 129-150.
Singh, "The Bleaching of Pulp", pp. 82-100, Standard Press Inc., Atlanta, Ga., 1979.

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