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Modification and Utilization of Wood Hydrolysates
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology. (Fiber och polymer teknologi)
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Polysaccharides have been used for many years in a variety of products such as food, fuel supply and industrial products. During recent years there has been an increasing interest in a group of polysaccharides, hemicelluloses, due to their highly availability, renewability and potentially low price. It is however a complicated process to extract highly purified hemicellulose and a more practical process is required so that a less refined resource can be used.

This thesis presents a study of the utilization of a simply filtrated and upgraded renewable biomass from the forest industry, so called wood hydrolysate. The wood hydrolysate is rich in hemicelluloses and contains some lignin.

Microspheres were successfully produced in a benign way from four different hydrolysates; two from softwood and two from hardwood. The microspheres were prepared in a water-in-oil emulsion and different parameters were regulated. The concentration of the dispersed phase, the temperature and the volume ratio of the dispersed phase and the continuous phase were changed and screened in a multi-variate statistical analysis program.

A series of hydrogels based on renewable wood hydrolysate were modified and their ability to swell was assessed. An unsaturated alcohol was activated with N,N’-carbonyldiimidazole (CDI), coupled to the hydroxyl group on the hemicellulose backbone and then radically crosslinked with acrylic acid as co-monomer to form a network. Two of the four wood hydrolysates were modified, one from softwood and one from hardwood, as well as the pure hemicelluloses. Hydrogels was successfully produced with the wood hydrolysate from hardwood and pure hemicellulose and the gels from the modified wood hydrolysate swelled the most, almost 30 % of its own weight.

In conclusion, this thesis shows that it is possible to use the renewable biomass, wood hydrolysate, in a variety of forms for future applications.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , 37 p.
Trita-CHE-Report, ISSN 1654-1081 ; 2011:53
Keyword [en]
wood hydrolysate, hemicellulose, microsphere, hydrogel
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-46973ISBN: 978-91-7501-150-9OAI: diva2:454372
2011-11-29, Rånbyrummet, Teknikringen 56, Stockholm, 09:00 (English)
Available from: 2011-11-15 Created: 2011-11-07 Last updated: 2011-11-15Bibliographically approved
List of papers
1. Microsphere valorization of forestry derived hydrolysates
Open this publication in new window or tab >>Microsphere valorization of forestry derived hydrolysates
2012 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 48, no 2, 372-383 p.Article in journal (Refereed) Published
Abstract [en]

A value-adding approach to the material utilization of non-cellulosic polysaccharides (NCPs) released from the lignocellulosic feedstock was realized via the formulation of renewable microspheres from wood hydrolysates using a purposely elaborated all edible water-in-oil emulsion technique. Four compositionally different hemicellulose rich wood hydrolysates were recovered from process waters in pulping and other hydrothermal treatments of hardwood and softwood. Multivariate screening designs were employed allowing for the identification and quantitation of significant process parameters and interaction effects governing the conversion of hydrolysates into small, smooth and well-defined microspheres with narrow size dispersity.

wood hydrolysate, microspheres, hemicelluloses, polysaccharide, emulsion
National Category
Polymer Technologies
urn:nbn:se:kth:diva-48053 (URN)10.1016/j.eurpolymj.2011.11.017 (DOI)000300380300013 ()2-s2.0-84855817401 (ScopusID)
QC 20120312Available from: 2011-11-15 Created: 2011-11-15 Last updated: 2012-03-12Bibliographically approved
2. Hydrogels from wood hydrolysates
Open this publication in new window or tab >>Hydrogels from wood hydrolysates
(English)Manuscript (preprint) (Other academic)
wood hydrolysate, hydrogels, hemicelluloses
National Category
Engineering and Technology
urn:nbn:se:kth:diva-48056 (URN)
Available from: 2011-11-15 Created: 2011-11-15 Last updated: 2011-11-15Bibliographically approved

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