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Polymers 2018, 10(8), 840; https://doi.org/10.3390/polym10080840

Recyclable Choline Nicotinate and Ferulate Aqueous Solutions as Efficient Lignin Solvents

1
School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, China
2
Hunan Academy of Forestry, Changsha, Hunan 410004, China
*
Authors to whom correspondence should be addressed.
Received: 20 June 2018 / Revised: 25 July 2018 / Accepted: 26 July 2018 / Published: 30 July 2018
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Abstract

Four novel choline carboxylate aqueous solution systems were developed by mixing H2O with choline nicotinate [Ch][Na], choline ferulate [Ch][Fa], choline vanillate [Ch][Va] and choline syringate [Ch][Sa]. The solubility of lignin in the four solvents was determined at 25 °C. The influence of the molar ratio of H2O to [Ch][Na] ([Ch][Fa], [Ch][Va] and [Ch][Sa]) and the anionic structure on lignin solubility were systematically investigated. It was found that, the anionic structure and H2O content significantly affected lignin dissolution. Interestingly, H2O/[Ch][Na] and H2O/[Ch][Fa] solvents show efficient capacity for lignin dissolution even at room temperatures. The dissolution of lignin in H2O/[Ch][Na] and H2O/[Ch][Fa] solvents is mainly ascribed to the interaction of lignin with the alkyl chain in the anion and cation dissociated from [Ch][Na]([Ch][Fa]) by H2O. In addition, the recycling of the lignin solvent was examined, and the structure and thermostability of the lignin regenerated from the solvent were also estimated. View Full-Text
Keywords: lignin; H2O/choline carboxylate solvent; dissolution mechanism; recycling; regenerated lignin properties lignin; H2O/choline carboxylate solvent; dissolution mechanism; recycling; regenerated lignin properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Xu, A.; Chen, L.; Xu, X.; Xiao, Z.; Liu, R.; Gao, R.; Yuan, M.; Zhang, L. Recyclable Choline Nicotinate and Ferulate Aqueous Solutions as Efficient Lignin Solvents. Polymers 2018, 10, 840.

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