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Issue 6, 2012
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Cellulose solubilities in carboxylate-based ionic liquids

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The dissolution of cellulose allows easier processing of this important biogenic feedstock. For this, ionic liquids have been proposed. Carboxylate-based ionic liquids were identified as the most promising lead towards a high dissolution property. Three homologous series of all 27 combination of the three cations: 1-ethyl-3-methylimidazolium, 1,3-dimethylimidazolium, and N,N-diethyl-N,N-dimethylammonium with nine carboxylates as anions were synthesised. The cellulose solubilities of the 17 ionic liquid compounds (liquid below 373 K) were measured. Up to 18 wt% for 1-ethyl-3-methyl-imidazolium propionate was achieved, slightly higher than when using acetate as the anion. Generally, the solubilities determined for carboxylate-based ionic liquids with imidazolium cations were found to be in the same range, whereas those with quaternary ammonium cations were found to be poor solvents for cellulose. Dicarboxylates gave higher solubilities compared to monocarboxylates. Regenerated ionic liquids had no apparent difference to fresh ones.

Graphical abstract: Cellulose solubilities in carboxylate-based ionic liquids

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Publication details

The article was received on 01 Dec 2011, accepted on 05 Dec 2011 and first published on 02 Feb 2012

Article type: Paper
DOI: 10.1039/C2RA01224C
RSC Adv., 2012,2, 2476-2479

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    Cellulose solubilities in carboxylate-based ionic liquids

    B. Zhao, L. Greiner and W. Leitner, RSC Adv., 2012, 2, 2476
    DOI: 10.1039/C2RA01224C

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