Abstract
Changes in hemicellulose and resin content of pulp were studied under various conditions of hot alkaline refining. The following results were obtained:(1) Within the range of conditions investigated, a correlation seemed to exist between the xylan or mannan contents and yields of pulps refined with hot alkaline solution. Removal of the xylan or mannan fractions from the pulp necessarily resulted in lower pulp yields.(2) Treatment of extracted β-cellulose with hot alkaline solution resulted in relatively easy dissolution of the xylan and mannan fractions. In situ, however, the xylan and mannan fractions resisted dissolution. The xylan fraction in pulp was particularly resistant.(3) The beneficial effects of using a surfactant during hot alkaline refining were apparent. With the use of a surfactant, resin removal could be effected without decreasing the yield. Resin removal was influenced by temperature, pH and surfactant concentration.
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