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Assessing Cellulose Dissolution Efficiency in Solvent Systems Based on a Robust Experimental Quantification Protocol and Enthalpy Data by Marc Kostag; Marcella Teixeira Dignani; Matheus Costa Lourenço; Thaís de Almeida Bioni; Omar A. El Seoud is a Engineering article available to read on EtoBox.
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## Abstract Dissolution of microcrystalline cellulose (MCC) in pure ionic liquids (ILs) and IL/dimethyl sulfoxide (DMSO) mixtures (mole fraction χ~DMSO~ = 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 (C~4~MeIm AcO), 1-(methoxyethyl)-3-methylimidazolium acetate (C~3~OMeIm 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·xH~2~O). The effects on MCC dissolution of IL/DMSO composition, and temperature (50, 70°C) were studied. C~4~MeIm AcO and C~4~MeIm AcO/DMSO were more efficient solvents than their C~3~OMeIm AcO counterparts, due to “deactivation” of the ether oxygen of C~3~OMeIm AcO. MCC dissolution by C~4~MeIm AcO/DMSO was compared with DBU AcO/DMSO, TMG AcO/DMSO at χ~DMSO~ = 0.6, and TBAF·xH~2~O/DMSO at χ~DMSO~ = 0.95. The relative efficiency was (solutions in DMSO): C~4~MeIm AcO > C~3~OMeIm AcO > DBU AcO > TMG AcO > TBAF·xH~2~O. The efficiency of C~4~MeIm AcO relative
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- Author
- Marc Kostag; Marcella Teixeira Dignani; Matheus Costa Lourenço; Thaís de Almeida Bioni; Omar A. El Seoud
- Publisher
- Walter de Gruyter GmbH
- Published
- 2019
- Language
- EN
- Field
- Engineering (Physical Sciences)