Process for delignification of chemical wood pulp using sodium s

Details Process for delignification of chemical wood pulp using sodium s Process for delignification of chemical wood pulp using sodium s

1984-06-22

1985-12-24

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Gas, vapor or mist contact

162 72, 162 84, 162 86, D21C 304, D21C 312, D21C 320, D21C 326

Patent

active

045604371

ABSTRACT:
In the delignification of chemical wood pulp with oxygen and alkali a larger reduction of the kappa number may be obtained without an increase in the charge of oxygen or alkali, provided the pulp is pretreated with a solution of sulphite or bisulphite in order to introduce hydrophilic groups in the sulphate lignin in the chemical wood pulp.

REFERENCES:
patent: 3647363 (1972-03-01), Chart et al.
patent: 3717545 (1973-02-01), Hess et al.
patent: 3725194 (1973-04-01), Smith et al.
patent: 4012280 (1977-03-01), Holton
patent: 4145246 (1979-03-01), Goheen et al.

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