Acidic depolymerization vs ionic liquid solubilization in lignin extraction from eucalyptus wood using the protic ionic liquid 1-methylimidazolium chloride

Ovejero-Pérez, Antonio; Rigual, Victoria; Domínguez, Juan C.; Alonso, Mar; Oliet, Mercedes; Rodrı́guez, Francisco

doi:10.1016/j.ijbiomac.2020.04.194

Cited by 54 publications

(26 citation statements)

References 58 publications

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“…Extensive lignin extraction (up to 82 wt %) of eucalyptus wood was reported by Ovejero‐Perez et al. using protic IL . It was also observed that β‐O‐4, β‐β and β‐5 linkages were severely depleted and more condensed lignin structures were produced due to the acidity of the protic IL.…”

Section: Structural Characteristics Of Various Ligninmentioning

confidence: 99%

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

et al. 2020

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The efficient valorization of lignin could dictate the success of the 2nd generation biorefinery. Lignin, accounting for on average a third of the lignocellulosic biomass, is the most promising candidate for sustainable production of value‐added phenolics. However, the structural alteration induced during lignin isolation is often depleting its potential for value‐added chemicals. Recently, catalytic reductive depolymerization of lignin has appeared to be a promising and effective method for its valorization to obtain phenolic monomers. The present study systematically summarizes the far‐reaching and state‐of‐the‐art lignin valorization strategies during different stages, including conventional catalytic depolymerization of technical lignin, emerging reductive catalytic fractionation of protolignin, stabilization strategies to inhibit the undesired condensation reactions, and further catalytic upgrading of lignin‐derived monomers. Finally, the potential challenges for the future researches on the efficient valorization of lignin and possible solutions are proposed.

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Section: Structural Characteristics Of Various Ligninmentioning

confidence: 99%

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

et al. 2020

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“…This would indicate that the economy of the process is mainly affected by the IL cost, a fact that has already been reported, and the capacity of recovering as much IL as possible after pretreatment. − In this line, studying the IL washing step is necessary, not only to minimize water consumption but also to ensure that the IL is totally (or almost totally) recovered. In addition, ILs that are easily synthesized by acid–base reaction (the case of [Ch][OAc]) are usually considered cheaper than the conventional ones. ,,, …”

Section: Resultsmentioning

confidence: 99%

“…In addition, ILs that are easily synthesized by acid−base reaction (the case of [Ch][OAc]) are usually considered cheaper than the conventional ones. 1,11,33,64 Looking at enzymatic digestibility values, washing with 3.5 g water/g IL seems to be appropriate, especially with [Emim]-[OAc]. However, when analyzing the economic balance, the recovery costs are heavily increased.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Technoeconomic Assessment of a Biomass Pretreatment + Ionic Liquid Recovery Process with Aprotic and Choline Derived Ionic Liquids

Ovejero-Pérez

Ayuso

Rigual

et al. 2021

ACS Sustainable Chem. Eng.

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Ionic liquids have shown promising results in biomass pretreatment; however, an extensive water washing step is necessary. This fact increases not only the processing costs but also those associated with the ionic liquid recovery step. In this work, Eucalyptus globulus wood pretreated with two acetate-based ionic liquids, namely 1-ethyl-3-methylimidazolium acetate and choline acetate, has been washed with increasing volumes of water in order to analyze the influence of the amount of washing water used on the subsequent enzymatic hydrolysis stage and on the IL recovery costs. Vapor−liquid equilibria data of recovered ionic liquid/water mixtures have been determined to simulate the IL recovery step with Aspen Plus, calculating the operating costs using the Aspen Plus Economics Analyzer afterward. [Emim][OAc] was more efficiently washed and more effective toward wood pretreatment than [Ch][OAc]. Both IL/water systems were successfully modeled, and simulation studies showed that incremental volumes of water led to higher operating costs in the IL recovery step that are compensated with less IL makeup costs. Therefore, this work offers a technoeconomical analysis of the IL recovery step in a real biorefinery pretreatment process as a function of the volume of water used in the pretreated wood washing stage.

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“…The elucidation of the mechanism of lignin extraction with PILs is presented in the literature. ,, According to the radar tool proposed by Costa et al (2015), it is possible to suppose that [Etid] extracted lignins with moderately preserved structure, with high β-O-4. However, condensation reactions were not observed for lignins from [2He][Lac] due to the higher temperature used for lignin solubilization.…”

Section: Resultsmentioning

confidence: 99%

Effect of Protic Ionic Liquids in Sugar Cane Bagasse Pretreatment for Lignin Valorization and Ethanol Production

Rabelo

et al. 2021

ACS Sustainable Chem. Eng.

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Ionic liquids have been called designer solvents because it is possible to fine-tune their properties from a huge range of possible combinations of cations and anions. In this work, we evaluate the potential of protic ionic liquids (PILs) in the fractionation of sugar cane bagasse in a biorefinery context. The PILs were designed to selectively solubilize lignin and leave a polysaccharides solid fraction. The carbohydrate fraction was further hydrolyzed to obtain pentose and hexose sugars, which were fermented using a pentose-consuming yeast. The results have shown that, differently from pretreatments that solubilize hemicelluloses, pentoses could be fermented together with hexoses without a prior detoxification step with high yield and productivity. The lignin recovered was characterized by 2D HSQC NMR, 31 P NMR, and GPC, showing that the design of the PIL influences lignin characteristics, but pretreatment temperature and time do not. The lignins obtained are sulfur-free, and the richness of their functional groups makes them attractive for conversion into a diversity of value-added products, which can make a biorefinery based on the proposed process viable.

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Acidic depolymerization vs ionic liquid solubilization in lignin extraction from eucalyptus wood using the protic ionic liquid 1-methylimidazolium chloride

Cited by 54 publications

References 58 publications

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

Recent Advances in the Catalytic Depolymerization of Lignin towards Phenolic Chemicals: A Review

Technoeconomic Assessment of a Biomass Pretreatment + Ionic Liquid Recovery Process with Aprotic and Choline Derived Ionic Liquids

Effect of Protic Ionic Liquids in Sugar Cane Bagasse Pretreatment for Lignin Valorization and Ethanol Production

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