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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
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Title: Pilot trials of hemicelluloses extraction prior to thermomechanical pulp production: Part 1

Source: Tappi Journal May 2011 pp. 21-28

Author(s)Houtman, Carl; Horn, Eric

Publication Year: 2011  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4709-1A

Abstract: 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.

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

Publication Review Process: Formally Refereed

File size: 232 kb(s)

Date posted: 07/05/2011

This publication is also viewable on Treesearch:  view
RITS Product ID: 39205
Current FPL Scientist associated with this product
Houtman, Carl J.
Chemical Engineer

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