Method for precipitating hemicellulose onto fibres for improved yield and beatability: Förfaringssätt för utfällning av hemicellulosa på fiber för förbättrat utbyte och malbarhet
1998 (English)Patent (Other (popular science, discussion, etc.))
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a liquid which is rich in hemicellulose, said liquid preferably comprising at least a part (14a, 514a) of said withdrawn spent impregnation liquid.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
IdentifiersURN: urn:nbn:se:kth:diva-49152OAI: oai:DiVA.org:kth-49152DiVA: 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)2011-11-252011-11-252013-08-09Bibliographically approved