Understanding cellulose dissolution: effect of the cation and anion structure of ionic liquids on the solubility of cellulose

Zhang, Jinming; Xu, Lili; Yu, Jian; Wu, Jin; Zhang, Xiaoyu; He, Jiasong; Zhang, Jun

doi:10.1007/s11426-016-0269-5

Cited by 72 publications

(43 citation statements)

References 54 publications

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“…13 interactions. These conclusions about the effects of the molecular structures of the ILs on solute-solvent interactions were extended to MCC dissolution in the different ILs [79]. FTIR, 1D 1 H and 13 C, and 2D NMR spectra ( 1 H-13 C HSQC) were employed to investigate the absorption of CO 2 by solutions of MCC dissolved in cold NaOH solution (8 wt%; −5 • C) without, or with previous treatment of cellulose with DBU.…”

Section: Use Of Nmr and Theoretical Calculations To Assess Ionic Liqumentioning

confidence: 99%

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

et al. 2019

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This review is focused on assessment of solvents for cellulose dissolution and the mechanism of regeneration of the dissolved biopolymer. The solvents of interest are imidazole-based ionic liquids, quaternary ammonium electrolytes, salts of super-bases, and their binary mixtures with molecular solvents. We briefly discuss the mechanism of cellulose dissolution and address the strategies for assessing solvent efficiency, as inferred from its physico-chemical properties. In addition to the favorable effect of lower cellulose solution rheology, microscopic solvent/solution properties, including empirical polarity, Lewis acidity, Lewis basicity, and dipolarity/polarizability are determinants of cellulose dissolution. We discuss how these microscopic properties are calculated from the UV-Vis spectra of solvatochromic probes, and their use to explain the observed solvent efficiency order. We dwell briefly on use of other techniques, in particular NMR and theoretical calculations for the same purpose. Once dissolved, cellulose is either regenerated in different physical shapes, or derivatized under homogeneous conditions. We discuss the mechanism of, and the steps involved in cellulose regeneration, via formation of mini-sheets, association into "mini-crystals", and convergence into larger crystalline and amorphous regions. We discuss the use of different techniques, including FTIR, X-ray diffraction, and theoretical calculations to probe the forces involved in cellulose regeneration.

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Section: Use Of Nmr and Theoretical Calculations To Assess Ionic Liqumentioning

confidence: 99%

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

et al. 2019

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“…e International Journal of Chemical Engineering parameters of C 0 , C 1 , C 2 , and C 3 are fitted by the experimental densities. Table S4 lists the fit parameters for (7). e calculated density data of the three mixtures are compared with the experiment values.…”

Section: Resultsmentioning

confidence: 99%

“…Yang et al and Wang et al studied the oxidation cleavage of β-O-4 bond in lignin model compounds and lignin dissolution using the IL of 1-octyl-3-methylimidazolium acetate ([C 8 mim][OAc]) [5,6]. Zhang et al reported the effect of the cation and anion structure of ionic liquids on the solubility of cellulose; however, [C 8 mim][OAc] exhibited poor dissolving capability due to its high viscosity that impedes the cellulose dissolution in ILs [7]. One of the possible ways to reduce the effects of IL high viscosity is to use solvent as the diluent or additive into IL.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of 1-Octyl-3-Methylimidazolium Acetate with Organic Solvents

Yang

Feng

2020

International Journal of Chemical Engineering

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Ionic liquid (IL) usually possesses high viscosity. In this work, the selected organic solvents, namely, dimethyl sulfoxide, N,N-dimethylacetamide, and N,N-dimethylformamide, were used as the diluents to lower IL viscosity. The thermophysical properties of the densities and viscosities for the binary mixtures of IL (i.e., 1-octyl-3-methylimidazolium acetate) with solvents were studied at normal pressure in the temperature ranges of 303.15 K to 348.15 K. The effects of the organic solvents on lowering IL viscosity were quantitatively evaluated. The excess properties of the mixtures were calculated to analyze the interactions between IL and solvents. The hard-sphere model was employed to reproduce the viscosity behavior of the pure substances and binary mixtures.

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“…Some studies with ILs outline that the nature of the anion is responsible for the dissolution of cellulose. However, it was also shown that especially the structure of the cation influences the solvation process, too . Overall, the dissolution process of cellulose in ILs is still not fully clarified.…”

Section: Selection Of Ionic Liquidsmentioning

confidence: 99%

Processing of Cellulose Using Ionic Liquids

Hermanutz

Vocht

Panzier

et al. 2018

Macro Materials & Eng

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The processing of cellulose dissolved in ionic liquids (ILs) enables the development of new materials. Besides the established production of cellulosic fiber products, interesting technical applications are developed like super micro filament fibers, cellulose/chitin blend fibers, precursors for carbon fibers, and all‐cellulose composites. This review provides a detailed summary of these new developments and describes how ILs are selected for the processing of cellulose with a particular emphasis on industrial realization. State‐of‐the‐art spinning processes are reviewed and it is illustrated how uniquely selected ILs can be used not only for established fiber spinning but for the development of new cellulose‐based materials.

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Understanding cellulose dissolution: effect of the cation and anion structure of ionic liquids on the solubility of cellulose

Cited by 72 publications

References 54 publications

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

Cellulose in Ionic Liquids and Alkaline Solutions: Advances in the Mechanisms of Biopolymer Dissolution and Regeneration

Thermophysical Properties of 1-Octyl-3-Methylimidazolium Acetate with Organic Solvents

Processing of Cellulose Using Ionic Liquids

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