Process for bleaching high yield pulp with hydrogen peroxide by

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

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162 90, D21C 916

Type

Patent

Status

active

Patent number

051694956

Description

ABSTRACT:
High-yield lignocellulosic wood pulps are bleached by treating same with an effective bleaching amount of hydrogen peroxide in an alkaline treatment medium, including adjusting the alkalinity of such pulp by adding a supplementary amount of alkaline agent thereto at that point in time when the amount of hydrogen peroxide consumed ranges from 40% to 75% of the effective amount thereof.

REFERENCES:
Colodette et al., "The Effect of pH Control on Peroxide Brightening of Stonegroundwood Pulp", J. of Pulp and Paper Science: vol. 16, No. 2, Mar. 1990.
Yotsuya et al., Abstract Bulletin of the Institute of Paper Chemistry, vol. 53, No. 4, issued Oct. 1982, Abstract No. 4579.
Abou-State et al., Abstract Bulletin of the Institute of Paper Chemistry, vol. 55, No. 8, issued Feb. 1985, Abstract No. 8870.

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