Boissou, Florent and Muehlbauer, Andrea and Vigier, Karine De Oliveira and Leclercq, Loic and Kunz, Werner and Marinkovic, Sinisa and Estrine, Boris and Nardello-Rataj, Veronique and Jerome, Francois (2014) Transition of cellulose crystalline structure in biodegradable mixtures of renewably-sourced levulinate alkyl ammonium ionic liquids, gamma-valerolactone and water. GREEN CHEMISTRY, 16 (5). pp. 2463-2471. ISSN 1463-9262, 1463-9270
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In this work, we report that combination of levulinate as a renewably sourced anion with short chain alkyl ammonium as a cation yields room temperature ionic liquids that are capable of dissolving up to 10 wt% of microcrystalline cellulose. This dissolution results in a change of the cellulose crystalline structure from cellulose I to cellulose II, a pre-requisite step known to significantly improve the accessibility of cellulose to enzymes. As compared to previous methodologies, such ILs tolerate the presence of up to 18 wt% of water. Hence technical grade ILs can be used, thus avoiding the energy-consuming drying process generally required with traditional ILs before dissolution experiments. In addition, such ILs can be mixed with 20 wt% of.-valerolactone, a renewably-sourced co-solvent, resulting in an improvement of the cellulose dissolution up to 20 wt% while concomitantly increasing the sustainability of these media. Finally, prepared ILs were proved to be biodegradable according to the OCDE 301F directive, thus opening a promising route for the pre-treatment of cellulose with a higher eco-efficiency.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CONVERSION; BIOMASS; TRANSFORMATION; PRETREATMENT; DISSOLUTION; DEPOLYMERIZATION; EXTRACTIONS; HYDROLYSIS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Nov 2019 10:34 |
| Last Modified: | 29 Nov 2019 10:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/11007 |
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