Lignin solubility in non‐imidazolium ionic liquids

BACKGROUND: Until now ionic liquid research concerning lignin dissolution and processing has mainly focused on the imidazolium type ionic liquids. Other types of ionic liquids can extend the scope of such processes due to their better thermal, base and oxidation stability. RESULTS: A series of ammon...

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Vydané v:Journal of chemical technology and biotechnology (1986) Ročník 90; číslo 10; s. 1821 - 1826
Hlavní autori: Glas, Daan, Van Doorslaer, Charlie, Depuydt, Daphne, Liebner, Falk, Rosenau, Thomas, Binnemans, Koen, De Vos, Dirk E
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Chichester, UK John Wiley & Sons, Ltd 01.10.2015
Wiley Subscription Services, Inc
Predmet:
Ammonium
biopolymer processes
Biotechnology
chemical structure
Chemical technology
Dissolution
Fourier transform infrared spectroscopy
Ionic liquids
lignin
lignosulfonates
Molecular structure
nuclear magnetic resonance spectroscopy
oxidative stability
Pyrolysis
Recycled
renewable chemical feedstock
Solubility
viscosity
Wood
ISSN:0268-2575, 1097-4660
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Shrnutí:BACKGROUND: Until now ionic liquid research concerning lignin dissolution and processing has mainly focused on the imidazolium type ionic liquids. Other types of ionic liquids can extend the scope of such processes due to their better thermal, base and oxidation stability. RESULTS: A series of ammonium, phosphonium and pyrrolidinium based ionic liquids was screened for lignin dissolution. Tributylmethylphosphonium methyl sulfate and N‐butyl‐N‐methylpyrrolidinium dicyanamide displayed the highest Kraft lignin dissolution at 90 °C, with 460 and 390 g kg‐¹, respectively. The latter ionic liquid combines this high solubility with a rather low viscosity, resulting in a promising medium for processing lignin and for other potential applications in wood separation technology. Owing to the ionic character of lignosulfonate, its solubility was even higher. The molecular structures of both recovered lignin and ionic liquid were not changed after lignin dissolution, as proven with FT‐IR, Curie‐point pyrolysis‐GC/MS and NMR. The ionic liquid could be recycled without loss in lignin dissolving ability. CONCLUSION: Ammonium, phosphonium, and pyrrolidinium based ionic liquids proved suitable for lignin dissolution, if combined with the right counterion. © 2014 Society of Chemical Industry
Bibliografia:http://dx.doi.org/10.1002/jctb.4492
ArticleID:JCTB4492
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ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.4492