Journal ArticleDOI
Thermophysical Characterization of Ionic Liquids Able To Dissolve Biomass
Mara G. Freire,Ana Rita R. Teles,Marisa A.A. Rocha,Bernd Schröder,Catarina M. S. S. Neves,Pedro J. Carvalho,Dmitry V. Evtuguin,Luís M. N. B. F. Santos,João A. P. Coutinho +8 more
TLDR
In this article, a set of thermophysical properties, namely, density, viscosity, and refractive index, as a function of temperature, and isobaric thermal expansivity and heat capacities at a constant temperature, were determined for eight ionic liquids with the 1-ethyl-3-methylimidazolium cation combined with the following anions: acetate, methylphosphonate, methanesulfonate and dimethylphosphate.Abstract:
Among new potential solvents for lignocellulosic materials, ionic liquids (ILs) are attracting considerable attention. Hence, the knowledge of the thermophysical properties of such fluids is essential for the design of related industrial processes. Therefore, in this work, a set of thermophysical properties, namely, density, viscosity, and refractive index, as a function of temperature, and isobaric thermal expansivity and heat capacities at a constant temperature, were determined for eight ionic liquids with the 1-ethyl-3-methylimidazolium cation combined with the following anions: acetate, methylphosphonate, methanesulfonate, trifluoromethanesulfonate, dicyanamide, thiocyanate, tosylate, and dimethylphosphate. Imidazolium-based ILs were chosen since these are the most studied ionic fluids in biomass dissolution approaches, while a large array of anions was investigated because it was already demonstrated that it is the IL anion that mainly governs the dissolution.read more
Citations
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Supercritical fluid extraction of bioactive compounds
TL;DR: In this paper, an analytical overview regarding the application of supercritical fluids in the extraction of bioactive compounds and their operative extraction conditions, along with the investigation of further improvements on the extraction efficiency and the applied techniques for the structural characterization and identification of such bio-active compounds are presented.
Journal ArticleDOI
The general AMBER force field (GAFF) can accurately predict thermodynamic and transport properties of many ionic liquids.
TL;DR: Results show that, for a wide range of ionic liquids, the general AMBER force field can reproduce a variety of thermodynamic and transport properties with similar accuracy to that of other published, often IL-specific, force fields.
Journal ArticleDOI
Viscosity of ionic liquids: an extensive database and a new group contribution model based on a feed-forward artificial neural network.
TL;DR: The model employs a two-layer feed-forward artificial neural network strategy to represent the relationship between the viscosity and the input variables: temperature, pressure, and group contributions (GCs).
Journal ArticleDOI
Systematic study of the thermophysical properties of imidazolium-based ionic liquids with cyano-functionalized anions.
Catarina M. S. S. Neves,Kiki A. Kurnia,João A. P. Coutinho,Isabel M. Marrucho,José N. Canongia Lopes,Mara G. Freire,Luís Paulo N. Rebelo +6 more
TL;DR: A detailed and comprehensive investigation of the influence of the -CN group through an analysis of the thermophysical properties of the related ILs shows that, regardless of the cation, the densities decrease with an increase in the number of cyano groups or anion molecular weight.
Journal ArticleDOI
Cellulose solvent-based pretreatment for enhanced second-generation biofuel production: a review
TL;DR: In this article, a comprehensive review of cellulose solvent-based lignocellulosic fractionation technologies for enhanced enzymatic hydrolysis to improve biofuel and renewable chemical production is reviewed.
References
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Journal ArticleDOI
Dissolution of Cellose with Ionic Liquids
TL;DR: In this paper, the authors demonstrate that cellulose can be dissolved without activation or pretreatment in, and regenerated from, 1-butyl-3-methylimidazolium chloride and other hydrophilic ionic liquids.
Journal ArticleDOI
Dissolution of cellulose with ionic liquids and its application : a mini-review
TL;DR: In this article, the dissolution of cellulose with ionic liquids and its application were reviewed, where cellulose can be easily regenerated from its ionic liquid solutions by addition of water, ethanol or acetone.
Journal ArticleDOI
Ionic Liquids and Their Interaction with Cellulose
TL;DR: This review aims to provide a summary of the current state of knowledge on the structural features of wood and introduces a new class of solvents, called ionic liquids, which have many attractive properties, including chemical and thermal stability, nonflammability, and immeasurably low vapor pressure.
Journal ArticleDOI
Dissolution of wood in ionic liquids.
Ilkka Kilpeläinen,Haibo Xie,Alistair W. T. King,Mari Granstrom,Sami Heikkinen,Dimitris S. Argyropoulos +5 more
TL;DR: The present paper demonstrates that both hardwoods and softwoods are readily soluble in various imidazolium-based ionic liquids (ILs) under gentle conditions, and offers a variety of new possibilities for its structural and macromolecular characterization, without the prior isolation of its individual components.
Journal ArticleDOI
Complete dissolution and partial delignification of wood in the ionic liquid 1-ethyl-3-methylimidazolium acetate
Ning Sun,Mustafizur Rahman,Ying Qin,Mirela L. Maxim,Héctor Rodríguez,Robin D. Rogers,Robin D. Rogers +6 more
TL;DR: In this paper, it was shown that both softwood (southern yellow pine) and hardwood (red oak) can be completely dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate ([C2mim]OAc) after mild grinding.