Ionic liquids and deep eutectic solvents for lignocellulosic biomass fractionation

Osch, Dannie J. G. P. van; Kollau, Laura J. B. M.; Bruinhorst, Adriaan van den; Asikainen, Sari; Rocha, Marisa A.A.; Kroon, MC Maaike

doi:10.1039/c6cp07499e

Cited by 229 publications

(117 citation statements)

References 217 publications

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“…12 In particular, Kamlet-Taft parameters have been extensively used to quantify the hydrogen-bond donating ability (α, acidity), the hydrogen bond accepting ability (β, basicity) and polarity/polarizability (π*) of ILs and DESs. 5,[13][14][15] It should be remarked that polarity is not an absolute property of the pure liquid and 16,17 hence, there is no single correct value when comparing polarity scales. 15,16 All polarity scales are relative and different scales give different polarities for the same solvent and even different relative polarities can arise for the many different measurement techniques that have been used.…”

Section: Introductionmentioning

confidence: 99%

A closer look into deep eutectic solvents: exploring intermolecular interactions using solvatochromic probes

Florindo

McIntosh

Welton

et al. 2018

Phys. Chem. Chem. Phys.

131

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Deep eutectic solvents (DESs) constitute a new class of ionic solvents that has been developing at a fast pace in recent years. Since these solvents are commonly suggested as green alternatives to organic solvents, it is important to understand their physical properties. In particular, polarity plays an important role in solvation phenomena. In this work, the polarity of different families of DESs was studied through solvatochromic responses of UV-vis absorption probes. Kamlet-Taft α, β, π* and EN parameters were evaluated using different solvatochromic probes, as 2,6-dichloro-4-(2,4,6-triphenyl-N-pyridino)-phenolate (Reichardt's betaine dye 33), 4-nitroaniline, and N,N-diethyl-4-nitroaniline for several families of DESs based on cholinium chloride, dl-menthol and a quaternary ammonium salt ([N]Cl). In addition, a study to understand the difference in polarity properties between DESs and the corresponding ILs, namely ILs based on cholinium cation and carboxylic acids as anions ([Ch][Lev], [Ch][Gly] and [Ch][Mal]), was carried out. The chemical structure of the hydrogen bond acceptor (HBA) in a DES clearly controls the dipolarity/polarizability afforded by the DES. Moreover, Kamlet-Taft parameters do not vary much within the family, but they differ among families based on different HBA, either for DESs containing salts ([Ch]Cl or [N]Cl) or neutral compounds (dl-menthol). A substitution of the HBD was also found to play an important role in solvatochromic probe behaviour for all the studied systems.

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Section: Introductionmentioning

confidence: 99%

A closer look into deep eutectic solvents: exploring intermolecular interactions using solvatochromic probes

Florindo

McIntosh

Welton

et al. 2018

Phys. Chem. Chem. Phys.

131

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“…They share solvent characteristics with ionic liquids but some advantages over ionic liquids are claimed, such as lower prices, chemical inertness with water and easy preparation by mixing its constituents at moderate temperature. In a similar way to the application of ionic liquids, research about deep eutectic solvents for biomass fractionation has been focused on the dissolution of cellulose and lignin and the extraction of these constituents from lignocellulosic biomass [156]. These solvents have displayed outstanding performance for the dissolution of lignin, whereas cellulose can barely be dissolved [157].…”

Section: Pretreatment Of Lignocellulosic Biomass For Hemicellulose Vamentioning

confidence: 99%

A Bibliometric Study of Scientific Publications regarding Hemicellulose Valorization during the 2000–2016 Period: Identification of Alternatives and Hot Topics

Abejón

2018

ChemEngineering

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A bibliometric analysis of the Scopus database was carried out to identify the research trends related to hemicellulose valorization from 2000 to 2016. The results from the analysis revealed an increasing number of annual publications, a high degree of transdisciplinary collaboration and prolific contributions by European researchers on this topic. The importance of a holistic approach to consider the simultaneous valorization of the three main components of lignocellulosic biomass (cellulose, hemicellulose and lignin) must be highlighted. Optimal pretreatment processes are critical for the correct fractionation of the biomass and the subsequent valorization. On the one hand, biological conversion of sugars derived from hemicellulose can be employed for the production of biofuel (ethanol) or chemicals such as 2,3-butadiene, xylitol and lactic acid. On the other hand, the chemical transformation of these sugars produces furfural, 5-hydroxyfurfural and levulinic acid, which must be considered very important starting blocks for the synthesis of organic derivatives.

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“…ILs present high solvation properties for a number of substances, e.g., water, methanol, acetone, chloroform, acetic anhydride, toluene, both polar and apolar, and even polymeric substances such as cellulose [21]. Many ILs present catalytic activity, and are able to stabilize catalysts and enzymes [22,23].…”

Section: Ilsmentioning

confidence: 99%

Ionic Liquid as Reaction Media for the Production of Cellulose-Derived Polymers from Cellulosic Biomass

et al. 2017

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Abstract:The most frequent polymer on nature is cellulose that is present together with lignin and hemicellulose in vegetal biomass. Cellulose can be, in the future, sustainable raw matter for chemicals, fuels, and materials. Nevertheless, only 0.3% of cellulose is processed nowadays due to the difficulty in dissolving it, and only a small proportion is used for the production of synthetic cellulosic fibers especially esters and other cellulose derivatives, normally in extremely polluting processes. The efficient and clean dissolution of cellulose is a major objective in cellulose research and development. Ionic liquids (ILs) are considered "green" solvents due to their low vapor pressure, that prevents them evaporating into the atmosphere. In addition, these molten salts present advantages in process intensification, leading to more than 70 patents in lignocellulosic biomass in ILs being published since 2005, most of them related to the production of cellulose derived polymers, e.g., acetates, benzoylates, sulfates, fuorates, phthalates, succinates, tritylates, or silylates. In this work, the use of ILs for production of cellulose derived polymers is thoroughly studied. To do so, in the first place, a brief summary of the state of the art in cellulose derivatives production is presented, as well as the main features of ILs in cellulose processing applications. Later, the main results in the production of cellulose derivatives using ILs are presented, followed by an analysis of the industrial viability of the process, considering aspects such as environmental concerns and ILs' recyclability.

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Ionic liquids and deep eutectic solvents for lignocellulosic biomass fractionation

Cited by 229 publications

References 217 publications

A closer look into deep eutectic solvents: exploring intermolecular interactions using solvatochromic probes

A closer look into deep eutectic solvents: exploring intermolecular interactions using solvatochromic probes

A Bibliometric Study of Scientific Publications regarding Hemicellulose Valorization during the 2000–2016 Period: Identification of Alternatives and Hot Topics

Ionic Liquid as Reaction Media for the Production of Cellulose-Derived Polymers from Cellulosic Biomass

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