Ionic liquid as a green solvent for lignin

Yunqiao Pu; Nan Jiang; Arthur J. Ragauskas

doi:10.1080/02773810701282330

Ionic liquid as a green solvent for lignin

Yunqiao Pu, Nan Jiang, Arthur J. Ragauskas

Georgia Institute of Technology

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516 Scopus citations

Abstract

This study examined the application of select ionic liquids (ILs) as aprotic green solvents for lignin. Dissolution experiments were carried out employing lignin isolated from pine kraft pulp. Up to 20 wt% lignin could be dissolved in [hmim][CF₃SO₃], [mmim][MeSO₄] and [bmim][MeSO₄]. For the [bmim]⁺-containing ionic liquids, the order of lignin solubility for varying anions was: MeSO₄]^- >Cl^- sim; Br^- ⋙ [PF₆]^-, indicating that the solubility of lignin was principally influenced by the nature of the anions. Ionic liquids containing large, non-coordinating anions [PF₄]^- and [PF₆]^- were unsuitable as a solvent for lignin. ¹³C nuclear magnetic resonance (NMR) analyses of lignin and model compounds showed that ¹³C signals using ionic liquid as a solvent were shifted up-field by δ 0.1 to 1.9 ppm in comparison to ¹³ C NMR data acquired using dimethyl sulfoxide (DMSO) as the solvent.

Original language	English
Pages (from-to)	23-33
Number of pages	11
Journal	Journal of Wood Chemistry and Technology
Volume	27
Issue number	1
DOIs	https://doi.org/10.1080/02773810701282330
State	Published - Jan 2007
Externally published	Yes

Keywords

Green solvent
Ionic liquids
Lignin

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10.1080/02773810701282330

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title = "Ionic liquid as a green solvent for lignin",

abstract = "This study examined the application of select ionic liquids (ILs) as aprotic green solvents for lignin. Dissolution experiments were carried out employing lignin isolated from pine kraft pulp. Up to 20 wt% lignin could be dissolved in [hmim][CF3SO3], [mmim][MeSO4] and [bmim][MeSO4]. For the [bmim]+-containing ionic liquids, the order of lignin solubility for varying anions was: MeSO4]- >Cl- sim; Br- ⋙ [PF6]-, indicating that the solubility of lignin was principally influenced by the nature of the anions. Ionic liquids containing large, non-coordinating anions [PF4]- and [PF6]- were unsuitable as a solvent for lignin. 13C nuclear magnetic resonance (NMR) analyses of lignin and model compounds showed that 13C signals using ionic liquid as a solvent were shifted up-field by δ 0.1 to 1.9 ppm in comparison to 13 C NMR data acquired using dimethyl sulfoxide (DMSO) as the solvent.",

keywords = "Green solvent, Ionic liquids, Lignin",

author = "Yunqiao Pu and Nan Jiang and Ragauskas, {Arthur J.}",

year = "2007",

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AU - Pu, Yunqiao

AU - Jiang, Nan

AU - Ragauskas, Arthur J.

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N2 - This study examined the application of select ionic liquids (ILs) as aprotic green solvents for lignin. Dissolution experiments were carried out employing lignin isolated from pine kraft pulp. Up to 20 wt% lignin could be dissolved in [hmim][CF3SO3], [mmim][MeSO4] and [bmim][MeSO4]. For the [bmim]+-containing ionic liquids, the order of lignin solubility for varying anions was: MeSO4]- >Cl- sim; Br- ⋙ [PF6]-, indicating that the solubility of lignin was principally influenced by the nature of the anions. Ionic liquids containing large, non-coordinating anions [PF4]- and [PF6]- were unsuitable as a solvent for lignin. 13C nuclear magnetic resonance (NMR) analyses of lignin and model compounds showed that 13C signals using ionic liquid as a solvent were shifted up-field by δ 0.1 to 1.9 ppm in comparison to 13 C NMR data acquired using dimethyl sulfoxide (DMSO) as the solvent.

AB - This study examined the application of select ionic liquids (ILs) as aprotic green solvents for lignin. Dissolution experiments were carried out employing lignin isolated from pine kraft pulp. Up to 20 wt% lignin could be dissolved in [hmim][CF3SO3], [mmim][MeSO4] and [bmim][MeSO4]. For the [bmim]+-containing ionic liquids, the order of lignin solubility for varying anions was: MeSO4]- >Cl- sim; Br- ⋙ [PF6]-, indicating that the solubility of lignin was principally influenced by the nature of the anions. Ionic liquids containing large, non-coordinating anions [PF4]- and [PF6]- were unsuitable as a solvent for lignin. 13C nuclear magnetic resonance (NMR) analyses of lignin and model compounds showed that 13C signals using ionic liquid as a solvent were shifted up-field by δ 0.1 to 1.9 ppm in comparison to 13 C NMR data acquired using dimethyl sulfoxide (DMSO) as the solvent.

KW - Green solvent

KW - Ionic liquids

KW - Lignin

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SP - 23

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JO - Journal of Wood Chemistry and Technology

JF - Journal of Wood Chemistry and Technology

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Ionic liquid as a green solvent for lignin

Abstract

Keywords

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