Oxygen-Alkali Treatment of Kraft Pulp and Cellobiitol. Model Experiments and Applied Studies of Interest for Oxygen Bleaching
Doctoral thesis, 1992

During oxygen delignification of kraft pulp the alkalinity has a decisive influence upon the selectivity, defined as viscosity at a given kappa number. Using 0.2% pulp consistency in order to achieve constant pH-levels a minimum selectivity was reached at pH 13, corresponding to 0.1 M NaOH. At higher pH-levels the selectivity increased and the yield decreased. By lowering the pH the selectivity and the yield increased. With Na2CO3 as active alkali the selectivity increased with decreasing alkalinity. Additions of large amounts of magnesium converted the alkali to Mg(OH)

selectivity

pH-levels

copper

oxygen delignification

catalytic effects

iron

alkali

cellobiitol

magnesium

yield

Author

Bengt Järrehult

Department of Engineering Chemistry

Other publications Research

Subject Categories

Chemical Sciences

ISBN

91-7032-715-7

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 879

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Created

10/7/2017

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