Issue 6, 2012
From the journal:

RSC Advances

Cellulose solubilities in carboxylate-based ionic liquids†

Bin Zhao,a   Lasse Greiner*ab  and  Walter Leitner*ac  

* Corresponding authors

a Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, Aachen, Germany

b DECHEMA e. V. Karl-Winnacker-Institut, Theodor-Heuss-Allee 25, Frankfurt am Main, Germany
E-mail: greiner@dechema.de
Fax: + 49-(0)697564-388
Tel: + 49-(0)697564-428

c Max-Planck-Institut für Kohlenforschung, Mülheim an der Ruhr, Germany

Abstract

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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Article information

DOI
https://doi.org/10.1039/C2RA01224C
Article type
Paper
Submitted
01 Dec 2011
Accepted
05 Dec 2011
First published
02 Feb 2012

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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