Method for brightening pulp

Details Method for brightening pulp Method for brightening pulp

1986-10-01

1987-06-23

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 78, D21C 320, D21C 300

Patent

active

046750762

ABSTRACT:
A method is disclosed for achieving additional bleaching of a wood pulp following a peroxide bleaching of the pulp, the method involving added thiourea to the slurry at a pH of 4 to 7 in the presence of residual peroxide and thereafter maintaining the slurry at a pH of 8 to 11.

REFERENCES:
patent: 3384534 (1968-05-01), Kindron et al.
patent: 3481828 (1969-12-01), Turner et al.
patent: 3507743 (1970-04-01), Cartsunis et al.
patent: 4244780 (1981-01-01), Rende et al.
Chemical Abstracts, 95:64045n.
Chemical Abstracts, 96:124823x.

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