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Halogen-free ionic liquids and their utilization as cellulose solvents
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Technical Chemistry)
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Technical Chemistry)
Umeå University, Faculty of Science and Technology, Department of Chemistry. (Technical Chemistry)
2012 (English)In: Journal of Molecular Structure, ISSN 0022-2860, E-ISSN 1872-8014, Vol. 1028, 156-163 p.Article in journal (Refereed) Published
Abstract [en]

This work demonstrates a novel synthesis route to halogen-free ionic liquids. A one-pot synthetic reaction route avoiding the use of toxic and high-energetic alkyl halides was developed to reduce the environmental impact of the synthesis process of ionic liquids. However, the elimination of halogens and alkyl halides in the preparation of ionic liquids is not just an environmental issue: the aforementioned species are also among the most common and persistent contaminants in today’s Ionic Liquids (ILs). Thus, this paper introduces a range of quaternized nitrogen based ionic liquids, including both aromatic and non-aromatic components, all prepared without alkyl halides in any step of the process. Moreover, bio-renewable precursors such as (bio-)alcohols and carboxylic acids were employed as anion sources and alkylation media, thus avoiding halogen contamination or halogen-containing anions. The IL’s prepared were designed to dissolve cellulose, some of which was included in a cellulose dissolution study using a sulphite cellulose from the company Domsjö.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 1028, 156-163 p.
Keyword [en]
Cellulose, Ionic liquid, Bio-refinery
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-58469DOI: 10.1016/j.molstruc.2012.06.044OAI: oai:DiVA.org:umu-58469DiVA: diva2:548377
Available from: 2012-08-30 Created: 2012-08-30 Last updated: 2017-12-07Bibliographically 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.
Keyword
Ionic liquid, Joniska vätskor
National Category
Chemical Sciences
Identifiers
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)
Opponent
Supervisors
Available from: 2013-05-07 Created: 2013-05-03 Last updated: 2013-05-03Bibliographically approved

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Gräsvik, JohnEliasson, BertilMikkola, Jyri-Pekka
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