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Ionic liquid fractionation of woody biomass for fermentable monosaccharides
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Technical Chemistry, Chemical-Biological Centre)
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2011 (English)In: Cellulose Chemistry and Technology, ISSN 0576-9787, Vol. 45, no 7-8, 483-486 p.Article in journal (Refereed) Published
Abstract [en]

The goal of the present study, devoted to wood fractionation, was to obtain monosaccharides, hexoses and pentoses by means of an ionic liquid (IL) based pre-treatment procedure. Softwood sawdust (maximum particle size of 2 mm) of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) were exposed to ionic liquids – 1-ethyl-3-methylimidazolium acetate (C2mimAce) and 1-ethyl-3-methylimidazolium chloride (C2mimCl) – and thermal treatment (80-150 °C), for various time intervals (0-72 h). Furthermore, cellulose of various origins (plants, wood pulps) was dissolved in C2mimAce and 1-butyl-3-methylimidazolium chloride (C4 mimCl) for the study of the dissolved fractions, stress being laid on monosaccharides and possible by-products, 5-hydroxymethylfurfural and furfural. Knowing the challenges in analysis techniques when ILs and sugars are involved, the present work focuses on the development of suitable analysis methods. To this end, a Hewlett Packard 1100 series HPLC equipped with a refractive index (RI), detector model HP1047 A and a diode array UV detector (DAD) fitted with a carbohydrate column HPX-87K was utilized. Challenges and improvements are discussed.


Place, publisher, year, edition, pages
Cellulose Chemistry and Technology , 2011. Vol. 45, no 7-8, 483-486 p.
Keyword [en]
ionic liquid fractionation, cellulose, softwood, fermentable monosaccharides, biomass
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-48267OAI: diva2:447779
Available from: 2011-10-13 Created: 2011-10-13 Last updated: 2013-05-03Bibliographically approved
In thesis
1. Ionic liquids in bio-refining: synthesis and applications
Open this publication in new window or tab >>Ionic liquids in bio-refining: synthesis and applications
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Fossil fuel resources are not limitless so alternative renewable recourses are needed to fill the void that inevitably will be created once the supplies of this resource start do dwindle. Biomass has the potential to fill this void. Today only a small part of the world annual production of biomass is utilized by humankind, while the rest is allowed to decay naturally. To utilize this renewable resource in the production of fuel and chemicals, the so called bio-refineries specialized in fractionation and making use of all component of the biomass are needed. Ionic liquids could aid in this task.

Ionic liquids (ILs) have shown great potential in the field of biomass processing in general and in the pretreatment of (ligno)-cellulose in particular. However, a few things need to be addressed before any large-scale processing can be considered: Finding new routes for IL synthesis that make "on-site" production possible; Investigation into the challenges facing IL pretreatment of (ligno)-cellulose such as possible depolymerization of cellulosic material during the pretreatment and investigating what influence different ILs have on the pretreatment of cellulosic material by methods like enzymatic hydrolysis.

This work aims to address these issues and will present a route for IL synthesis making use of alcohols and carboxylic acids both commonly found in a biorefinery. Some of these ILs have also been tested for their ability of dissolve cellulose. Furthermore, this work will address the possibilities but also challenges upon IL-mediated (ligno)-cellulose processing. This includes investigating several ILs and their efficiency as a pretreatment solvent for enzymatic hydrolysis; these studies involve a large variety of different cellulosic materials. This work demonstrated that depolymerization during the IL pretreatment is a possibility and that this can complicate the recovery processes. Furthermore, this work gives guidance into what type of ILs might be suited as pretreatment solvents for different cellulosic materials, including amorphous and crystalline cellulose, processed and native lignocellulose, different types of wood samples and hemicellulose.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2013. 104 p.
Ionic liquid, Joniska vätskor
National Category
Chemical Sciences
urn:nbn:se:umu:diva-69125 (URN)978-91-7459-655-7 (ISBN)
Public defence
2013-05-30, KBC-huset, KB3B1, Umeå universitet, Umeå, 10:00 (English)
Available from: 2013-05-07 Created: 2013-05-03 Last updated: 2013-05-03Bibliographically approved

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Gräsvik, JohnMikkola, Jyri-Pekka
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