Lignin-First Approach to Biorefining: Utilizing Fenton’s Reagent and Supercritical Ethanol for the Production of Phenolics and Sugars

Sagues, William J.; Bao, Hanxi; Nemenyi, John L.; Tong, Zhaohui

doi:10.1021/acssuschemeng.7b04500

Cited by 64 publications

(31 citation statements)

References 29 publications

(73 reference statements)

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“…The considerations above are important when dealing with lignin as part of the biomass material, for example, when converting lignin as part of the lignocellulosem aterialb yf ractionation methodologies of the lignin-first type. [208][209][210][211] However, in many cases research is done on specific fractionated lignin streams. Here, the fractionation methodology can significantly alter the structure of the lignin extracted from the originalb iomass source.…”

Section: Lignocellulose/ligninfeedstockmentioning

confidence: 99%

An Introduction to Model Compounds of Lignin Linking Motifs; Synthesis and Selection Considerations for Reactivity Studies

et al. 2020

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The development of fundamentally new valorization strategies for lignin plays a vital role in unlocking the true potential of lignocellulosic biomass as sustainable and economically compatible renewable carbon feedstock. In particular, new catalytic modification and depolymerization strategies are required. Progress in this field, past and future, relies for a large part on the application of synthetic model compounds that reduce the complexity of working with the lignin biopolymer. This aids the development of catalytic methodologies and in‐depth mechanistic studies and guides structural characterization studies in the lignin field. However, due to the volume of literature and the piecemeal publication of methodology, the choice of suitable lignin model compounds is far from straight forward, especially for those outside the field and lacking a background in organic synthesis. For example, in catalytic depolymerization studies, a balance between synthetic effort and fidelity compared to the actual lignin of interest needs to be found. In this Review, we provide a broad overview of the model compounds available to study the chemistry of the main native linking motifs typically found in lignins from woody biomass, the synthetic routes and effort required to access them, and discuss to what extent these represent actual lignin structures. This overview can aid researchers in their selection of the most suitable lignin model systems for the development of emerging lignin modification and depolymerization technologies, maximizing their chances of successfully developing novel lignin valorization strategies.

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Section: Lignocellulose/ligninfeedstockmentioning

confidence: 99%

An Introduction to Model Compounds of Lignin Linking Motifs; Synthesis and Selection Considerations for Reactivity Studies

et al. 2020

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“…Alternatively, the use of hydrogen could also be avoided through the utilization of Fenton’s reagent (Fe 3+ , H 2 O 2 ), that combined with enzymatic hydrolysis transformed sweet sorghum bagasse into phenolic monomers and sugars [ 68 ]. Initially, the feedstock’s molecular structure was modified through iron chelation and free radical oxidation via Fenton’s reagent.…”

Section: Chronological Overviewmentioning

confidence: 99%

Development of ‘Lignin-First’ Approaches for the Valorization of Lignocellulosic Biomass

et al. 2020

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Currently, valorization of lignocellulosic biomass almost exclusively focuses on the production of pulp, paper, and bioethanol from its holocellulose constituent, while the remaining lignin part that comprises the highest carbon content, is burned and treated as waste. Lignin has a complex structure built up from propylphenolic subunits; therefore, its valorization to value-added products (aromatics, phenolics, biogasoline, etc.) is highly desirable. However, during the pulping processes, the original structure of native lignin changes to technical lignin. Due to this extensive structural modification, involving the cleavage of the β-O-4 moieties and the formation of recalcitrant C-C bonds, its catalytic depolymerization requires harsh reaction conditions. In order to apply mild conditions and to gain fewer and uniform products, a new strategy has emerged in the past few years, named ‘lignin-first’ or ‘reductive catalytic fractionation’ (RCF). This signifies lignin disassembly prior to carbohydrate valorization. The aim of the present work is to follow historically, year-by-year, the development of ‘lignin-first’ approach. A compact summary of reached achievements, future perspectives and remaining challenges is also given at the end of the review.

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“…Selective lignin depolymerization (SLD) of sorghum bagasse was studied by Sagues et al (2018) using subcritical (180 • C) and supercritical ethanol (250 • C) for 0.5-3 h with previous Fenton oxidation using 20% H 2 O 2 at 60 • C for 1 h. Supercritical ethanol provided higher lignin depolymerization and better holocellulose preservation compared to subcritical ethanol. Besides that, within 3 h of SLD, supercritical ethanol enhanced the production of phenolic oils by 145% compared to subcritical ethanol.…”

Section: Other Supercritical Fluid Technologiesmentioning

confidence: 99%

Supercritical Fluids: A Promising Technique for Biomass Pretreatment and Fractionation

Escobar

Silva

Pirich

et al. 2020

Front. Bioeng. Biotechnol.

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Lignocellulosic biomasses are primarily composed of cellulose, hemicelluloses and lignin and these biopolymers are bonded together in a heterogeneous matrix that is highly recalcitrant to chemical or biological conversion processes. Thus, an efficient pretreatment technique must be selected and applied to this type of biomass in order to facilitate its utilization in biorefineries. Classical pretreatment methods tend to operate under severe conditions, leading to sugar losses by dehydration and to the release of inhibitory compounds such as furfural (2-furaldehyde), 5-hydroxy-2-methylfurfural (5-HMF), and organic acids. By contrast, supercritical fluids can pretreat lignocellulosic materials under relatively mild pretreatment conditions, resulting in high sugar yields, low production of fermentation inhibitors and high susceptibilities to enzymatic hydrolysis while reducing the consumption of chemicals, including solvents, reagents, and catalysts. This work presents a review of biomass pretreatment technologies, aiming to deliver a state-of-art compilation of methods and results with emphasis on supercritical processes.

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Lignin-First Approach to Biorefining: Utilizing Fenton’s Reagent and Supercritical Ethanol for the Production of Phenolics and Sugars

Cited by 64 publications

References 29 publications

An Introduction to Model Compounds of Lignin Linking Motifs; Synthesis and Selection Considerations for Reactivity Studies

An Introduction to Model Compounds of Lignin Linking Motifs; Synthesis and Selection Considerations for Reactivity Studies

Development of ‘Lignin-First’ Approaches for the Valorization of Lignocellulosic Biomass

Supercritical Fluids: A Promising Technique for Biomass Pretreatment and Fractionation

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