The fundamental investigation of kraft cooking from the viewpoint of chemical engineering

Part 2 The stoichiometric analysis of kraft cooking reaction

Abstract

This report concerns the experimental results to clarify the stoichiometry between the consumption of alkali or sulfur, and the dissolution of wood components (carbohydrate, lignin, etc.) during alkali cooking of two wood species, Buna (Fagus crenata Blume) and Akamatsu (Pinus densi flora S. et Z.).
From the results, the different manner of the carbohydrate dissolution was observed between kraft and soda cooking of Buna, but no difference in the case of Akamatsu. The most part of lignin in both woods was dissolved on the bulk delignification stage. NaOH was guantitatively consumed by dissolution of carbohydrate, but no Na₂S was consumed by it. A small part of Na₂S was consumed during the delignification reaction.