Abstract
Extractives composition and distribution was examined around the oxygen delignification stage in a birch kraft pulp mill. Pulp suspensions were divided into different fractions with a dynamic drainage jar device to obtain fibers (+100 mesh), large fines (100–200 mesh), and small fines (200–400 mesh) fractions as well as the colloidal and dissolved fractions. The fractions were extracted and the resin components analyzed by gas chromatography. No significant oxidation reactions of wood resin were found to occur in oxygen delignification. Major removal of resin was achieved in the subsequent washer, where resin is removed with dissolved, colloidal, and fines fractions. Overall deresination in the subsequent washer was 58%.
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