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

Författare

Bengt Järrehult

Institutionen för teknisk kemi

Ämneskategorier

Kemi

ISBN

91-7032-715-7

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 879