Mild steam explosion and chemical pre-treatment of Norway spruce
2012 (English)In: BioResources, ISSN 1930-2126, Vol. 7, no 2, 2051-2074 p.Article in journal (Refereed) Published
The aim of this work is to open up the structure of wood while retaining a large amount of hemicelluloses, in particular (galacto)glucomannans. The effects of pre-treatments on wood meal from spruce (Picea abies) with a reducing agent (NaBH4) combined with steam explosion at very mild conditions were investigated. The effects of steam explosion at 160 degrees C were studied for various residence times (5 to 35 min) on both water-impregnated wood meal and samples pre-treated with NaBH4. The findings showed that pre-treatment with sodium borohydride stabilized the reducing end-groups of glucomannans and that the treatment was effective both during mild steam explosion, for both long and short residence times, as well as during subsequent treatment in alkali. Extraction experiments at different pH and temperatures showed that the main part of the hemicelluloses still remained in the wood residue after treatment. The molecular weight distributions of the extracted material from the liquors indicated that there were broad molecular distributions and that the molecular weight averages were between 3 and 6 kDa.
Place, publisher, year, edition, pages
2012. Vol. 7, no 2, 2051-2074 p.
Mild steam explosion, Wood separation, Spruce, (galacto)Glucomannan, NaBH4
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-100794ISI: 000306481700054ScopusID: 2-s2.0-84863814434OAI: oai:DiVA.org:kth-100794DiVA: diva2:545083
FunderKnut and Alice Wallenberg Foundation
QC 201208172012-08-172012-08-172012-08-17Bibliographically approved