Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1986-09-15
1988-03-22
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 19, 162 76, 162 78, 162 80, D21C 916
Patent
active
047326506
ABSTRACT:
Bleaching of wood pulp is improved by the combination of a pretreatment of the pulp with a polyaminocarboxylic acid, e.g. ethylenediaminetetraacetic acid, prior to bleaching with an alkaline aqueous peroxide solution containing a stabilizing amount of an aminophosphonic acid derivative together with a polymer of an unsaturated carboxylic acid or amide or an alkylsulfonic acid substituted amide.
REFERENCES:
patent: 3860391 (1975-01-01), Kling et al.
patent: 4599138 (1986-07-01), Lindahl
patent: 4614646 (1986-09-01), Christiansen
Christiansen Steven H.
Michalowski Robert J.
Myers Jimmy
Wilson David A.
Ancona A. Cooper
Chin Peter
Dang Thi
The Dow Chemical Company
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