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    Description

    Pilot data indicate that wood chip pretreatment with oxalic acid reduced the specific energy required to make thermomechanical pulp. A combined oxalic acid/bisulfite treatment resulted in 21% refiner energy savings and 13% increase in brightness for aspen. A low level of oxalic acid treatment was effective for spruce. Energy savings of 30% was observed with no significant change in strength properties. Adding bisulfite did not significantly increase the brightness of the spruce pulp. For pine, the optimum treatment was a moderate level of oxalic acid, which resulted in 34% energy savings and an increase in strength properties. For all of these treatments 1–3 w/w % carbohydrates were recovered, which can be fermented to produce ethanol. The extract sugar solution contained significant quantities of arabinose.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Houtman, Carl; Horn, Eric. 2011. Pilot trials of hemicelluloses extraction prior to thermomechanical pulp production: Part 1. Tappi Journal. 10(5): 21-28.

    Keywords

    Pulping, hemicellulose, oxalic acid, pretreatment, wood chips, Populus, Picea, sugars, Pinus, carbohydrates, energy conservation. pine, aspen, spruce, thermomechanical pulping, pulp and paper processes, biorefining, wood extractives, chips, bisulfite, brightness, paper strength, arabinose, pretreatment

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https://www.fs.usda.gov/treesearch/pubs/38678