Comparative Study of the Delignification Efficiencies of Alkaline Pulping Systems, 1994 Pulping Conference Proceedings
B. N. Brogdon, D. R. Dimmel
A specific model reaction has been developed that provides information on relative rates of reactions between pulping chemicals and quinone methides. The latter are key lignin intermediates that affect delignification events in pulping systems. A quinone methide model has been reacted under soda, kraft, soda-AQ, and sulfite conditions, and in the presence of organic/water solvent mixtures. The results indicate that reactions of the pulping reagents and quinone methides are reversible in most cases and that AHQ is the most effective reagent at promoting ß-aryle ether cleavage – a important delignification reaction. The delignification efficiencies of AQ were improved in organic/water solvent mixtures and in the presence of sulfite ions.
Comparative Study of the Delignification Efficiencies of Alkaline Pulping Systems, 1994 Pulping Conf