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Method for precipitating hemicellulose onto fibres for improved yield and beatability: Förfaringssätt för utfällning av hemicellulosa på fiber för förbättrat utbyte och malbarhet
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-2900-4713
1998 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

A method for continuous cooking of lignocellulosic fibre material, comprising the steps of sequentially (a) in a first stage, impregnating the fibre material in an impregnation liquid comprising alkali metal hydroxide, and thereafter withdrawing (14, 514) a spent impregnation liquid; (b) in a second stage, cooking the fibre material in a cooking liquor comprising alkali metal hydroxide; and (c) in a third stage, adding (A), to said fibre material, a liquid which is rich in hemicellulose, said liquid preferably comprising at least a part (14a, 514a) of said withdrawn spent impregnation liquid. In a fourth stage (d), the fibre material is cooked in a cooking liquor comprising the liquid added in the third stage, whereby the fibre material is subjected to a retention time of at least 1 hour in said fourth stage.

Place, publisher, year, edition, pages
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Chemical Sciences
URN: urn:nbn:se:kth:diva-49152OAI: diva2:459312
US 6468390-B1 (2002-10-22)

EP 1115943-B1 (2003-09-03); CA 2338363-C (2007-12-04); BR 9912997-B1 (2009-09-22)

Available from: 2011-11-25 Created: 2011-11-25 Last updated: 2013-08-09Bibliographically approved

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Mikael, Lindström
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