Abstract
Changing the cation of an ionic liquid was shown to have a significant effect on lignin solubility, with interaction of aromatic cations with the solute being significant. The effect of the anion on lignin solubility was negligible, above a minimum hydrogen bond basicity.
Highlights
A facile technique for the quantification of lignin solubility in ionic liquids has been established
They are made up of a large organic cation and either an organic or an inorganic anion.[2]. They are generally non-volatile, nonflammable solvents that can theoretically be recycled.[3]. These aspects mean that ionic liquids have drawn a lot of attention as potential replacements for the environmentally hazardous molecular solvents that are currently used.[1,3,4,5]
Lignin solubility in a wider range of ionic liquids was modelled by simulating the excess enthalpy of the model compound, pinoresinol,[13] and a further four model compounds.[14]
Summary
Ionic liquids are salts with low melting points (arbitrarily defined as below 100 °C1) They are made up of a large organic cation (usually containing either a positively charged nitrogen or phosphorus centre, often incorporated into a heterocycle in the nitrogen cases) and either an organic or an inorganic anion.[2] They are generally non-volatile, nonflammable solvents that can theoretically be recycled.[3] These aspects mean that ionic liquids have drawn a lot of attention as potential replacements for the environmentally hazardous molecular solvents that are currently used.[1,3,4,5]. Communication into the use of ionic liquids to dissolve lignocellulosic biomass that, along with enhancing their potential in biomass process will enable further study of biomass reactivity in ionic liquids
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