Effect of Hot Water Extraction Conditions on the Subsequent Kraft Pulping of Pine Chips, 2008 Engineering, Pulping and Environmental Conference

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Hot water extraction of wood chips is an effective method of separating fermentable sugars from wood prior to pulping. Potential difficulties with this practice include a reduction in yield and strength of the final pulp. The possible reduction in strength is particularly problematic with southern pine since that pulp is included in paper and board products primarily for its strength contribution. Composition analysis of chips, extracted chips, pulp, and hydrolyzate are performed to assess the hemicellulose extraction efficiency and subsequent loss during kraft pulping of Loblolly Pine. On line control of the extraction conditions is used to influence the quantity of hemicellulose recovered in the hydrolyzate and the yield and properties of the final pulp.