Assessing cellulose dissolution efficiency in solvent systems based on a robust experimental quantification protocol and enthalpy data
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Marc Kostag
Abstract
Dissolution of microcrystalline cellulose (MCC) in pure ionic liquids (ILs) and IL/dimethyl sulfoxide (DMSO) mixtures (mole fraction χDMSO = 0.2–0.9) was quantified using a specially constructed mechanical stirring system that allows reproducible agitation speed; temperature control, and minimum solution-air contact. The electrolytes employed were: 1-(n-butyl)-3-methylimidazolium acetate (C4MeIm AcO), 1-(methoxyethyl)-3-methylimidazolium acetate (C3OMeIm AcO), 1,8-diazabicyclo[5.4.0]undec-7-enium acetate (DBU AcO), tetramethylguanidinium acetate (TMG AcO), and tetra(n-butyl)ammonium fluoride hydrate (TBAF·xH2O). The effects on MCC dissolution of IL/DMSO composition, and temperature (50, 70°C) were studied. C4MeIm AcO and C4MeIm AcO/DMSO were more efficient solvents than their C3OMeIm AcO counterparts, due to “deactivation” of the ether oxygen of C3OMeIm AcO. MCC dissolution by C4MeIm AcO/DMSO was compared with DBU AcO/DMSO, TMG AcO/DMSO at χDMSO = 0.6, and TBAF·xH2O/DMSO at χDMSO = 0.95. The relative efficiency was (solutions in DMSO): C4MeIm AcO > C3OMeIm AcO > DBU AcO > TMG AcO > TBAF·xH2O. The efficiency of C4MeIm AcO relative to C3OMeIm AcO is due to higher solution basicity. Isothermal titration calorimetry was used to study cellobiose-solvent interactions. Except for TBAF·xH2O/DMSO, these interactions are exothermic; the relative solvent efficiency increases with increasing dissolution |enthalpy|. Using the mole fraction concentration scale to report cellulose dissolution avoids possible ambiguities.
Funding source: O.A. El Seoud and M. Kostag thank the FAPESP research foundation for financial support, postdoctoral fellowship, and the ITC equipment
Award Identifier / Grant number: 2014/ 22136-4
Award Identifier / Grant number: 2016/22869-7
Award Identifier / Grant number: 2017/06394-1
Funding source: O.A. El Seoud thanks CNPq for research productivity fellowship
Award Identifier / Grant number: 307022/2014-5
Funding statement: O.A. El Seoud and M. Kostag thank the FAPESP research foundation for financial support, postdoctoral fellowship, and the ITC equipment, Funder Id: http://dx.doi.org/10.13039/501100001807 (grants 2014/ 22136-4, 2016/22869-7, 2017/06394-1, respectively). O.A. El Seoud thanks CNPq for research productivity fellowship (grant 307022/2014-5).
Acknowledgments
We thank the following persons: E.O. Moraes for initial help with equipment construction; B. Zimmermann from Elmi-Tec for his interest and effort during the construction of the agitation system; D. Ferreira (IPT) for allowing us to report the effective Lewis basicity data; R. Contessotto and M. Timich of the Polytechnic School, for performing the SEM measurements, and C. Guizzo for assembling Figure 3.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Employment or leadership: None declared.
Honorarium: None declared.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/hf-2019-0086).
©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
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- Annual Reviewer Acknowledgement
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Articles in the same Issue
- Frontmatter
- Original Articles
- Analysis of tension and bending fracture behavior in moso bamboo (Phyllostachys pubescens) using synchrotron radiation micro-computed tomography (SRμCT)
- Water vapour sorption properties of thermally modified and pressurised hot-water-extracted wood powder
- Artificially aged spruce and beech wood surfaces reactivated using FE-DBD atmospheric plasma
- Evaluation of ring-5 structures of guaiacyl lignin in Ginkgo biloba L. using solid- and liquid-state 13C NMR difference spectroscopy
- A study of the physico-chemical properties of dried maritime pine resin to better understand the exudation process
- Assessing cellulose dissolution efficiency in solvent systems based on a robust experimental quantification protocol and enthalpy data
- Short Notes
- Evaluation of moisture diffusion in lignocellulosic biomass in steady and unsteady states by a dynamic vapor sorption apparatus
- On tylosis ultrastructure in Quercus cerris L.
- Annual Reviewer Acknowledgement
- Reviewer acknowledgement Holzforschung volume 73 (2019)