Oxidative depolymerization potential of biorefinery lignin obtained by ionic liquid pretreatment and subsequent enzymatic saccharification of eucalyptus

Ninomiya, Kazuaki; Ochiai, Kobako; Eguchi, Mao; Kuroda, Kosuke; Tsuge, Yota; Ogino, Chiaki; Taima, Tetsuya; Takahashi, Kenji

doi:10.1016/j.indcrop.2017.10.056

Cited by 30 publications

(2 citation statements)

References 20 publications

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“…To obtain pseudo 'native' lignin, organosolv, [46] ionic liquid, [47,48] and deep eutectic solvent extraction (DES) [18,49] are useful because of their solubilizing ability under mild reaction conditions (low temperature), but they show relatively low lignin yields. The inevitable dissolution of cellulose and hemicellulose, tedious separation steps and recovery of ionic liquid and DES remain challenging obstacles.…”

Section: Morementioning

confidence: 99%

High-yield Aromatic Monomers and Pure Cellulose Production by Oxidative Catalytic Fractionation of Lignocellulose in the presence of CuO Nanoparticles

Zhu

Liao²,

Lu³

et al. 2021

Preprint

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<a></a><a>Herein, we report the catalytic use of multifunctional CuO nanoparticles (NPs) to oxidatively fractionate lignocellulosic feedstock with dioxygen in aqueous NaOH under mild conditions . In presence of CuO NPs, lignocellulose is fractionated into three parts, overall yielding 90% carbon efficiency. Lignin is converted to up to 45.6 wt% in organic soluble aromatic aldehyde monomers, rich in vanillin and syringaldehyde, the value surpassing the theoretical one based on b-O-4 bond content, indicating significant cleavage of other ether bonds. All hemicellulose is selectively converted into water soluble small (di)acids, mainly to oxalic acid. Up to 81% of cellulose, in contrast, is obtained as a white crystalline residue with high cellulose purity (over 95%), which can readily be transformed into high quality nanocellulose, useful in many applications.</a>

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Section: Morementioning

confidence: 99%

High-yield Aromatic Monomers and Pure Cellulose Production by Oxidative Catalytic Fractionation of Lignocellulose in the presence of CuO Nanoparticles

Zhu

Liao²,

Lu³

et al. 2021

Preprint

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“…However, to date, the published research works exploring ILs for the valorization of lignin through its depolymerization have involved relatively harsh conditions: temperatures higher than 100 °C, oxygen pressures, additional metal/acid catalysts, etc . Such is the case, in particular, of the works investigating, for this purpose, the IL 1-ethyl-3-methylimidazolium acetate ([C 2 mim][OAc]). − This is an archetypal IL in the pretreatment and dissolution of lignocellulosic biomass, exhibiting a remarkably high lignin dissolution capacity, ,,, along with other appealing attributes: reasonably good thermal stability, liquid character down to far below room temperature, good biocompatibility, and low toxicity. ,− Theoretical studies have evidenced a strong hydrogen-bond interaction between lignin model solutes and ILs like [C 2 mim][OAc], containing an anion with a remarkable hydrogen-bond acceptor character . Nevertheless, it has also been shown that both the [C 2 mim] + cation and the [OAc] − anion play an active role, for example, in the mechanisms of dissolution of lignin in this IL, with the two ions establishing key interactions with hydroxyl groups of the lignin structure …”

Section: Introductionmentioning

confidence: 99%

Capacity of Aqueous Solutions of the Ionic Liquid 1-Ethyl-3-methylimidazolium Acetate to Partially Depolymerize Lignin at Ambient Temperature and Pressure

Pena,

Rodil,

Rodríguez

2024

J. Agric. Food Chem.

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Lignin is a very attractive and abundant biopolymer with the potential to be a biorenewable source of a large number of value-added organic chemicals. The current state-of-the-art methods fail to provide efficient valorization of lignin in this regard without the involvement of harsh conditions and auxiliary substances that compromise the overall sustainability of the proposed processes. Making an original approach from the set of mildest temperature and pressure conditions, this work identifies and explores the capacity of an aqueous solution of the nonvolatile ionic liquid 1-ethyl-3-methylimidazolium acetate ([C 2 mim][OAc]) to partially depolymerize technical lignin (Indulin AT) by means of a treatment consisting in the simple contact at ambient temperature and pressure. Among a considerable number of valuable phenolic molecules that were identified in the resulting fluid, vanillin (yield of about 3 g/kg) and guaiacol (yield of about 1 g/kg) were the monophenolic compounds obtained in a higher concentration. The properties of the post-treatment solids recovered remain similar to those of the original lignin, although with a relatively lower abundance of guaiacyl units (in agreement with the generation of guaiacyl-derived phenolic molecules, such as vanillin and guaiacol). The assistance of the treatment with UV irradiation in the presence of nanoparticle catalysts does not lead to an improvement in the yields of phenolic compounds.

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Current Approaches for Polyurethane Production from Lignin

Hernández‐Ramos

Hoyos-Martínez

Barriga

et al. 2023

Biorefinery: A Sustainable Approach for the Production of Biomaterials, Biochemicals and Biofuels

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Oxidative depolymerization potential of biorefinery lignin obtained by ionic liquid pretreatment and subsequent enzymatic saccharification of eucalyptus

Cited by 30 publications

References 20 publications

High-yield Aromatic Monomers and Pure Cellulose Production by Oxidative Catalytic Fractionation of Lignocellulose in the presence of CuO Nanoparticles

High-yield Aromatic Monomers and Pure Cellulose Production by Oxidative Catalytic Fractionation of Lignocellulose in the presence of CuO Nanoparticles

Capacity of Aqueous Solutions of the Ionic Liquid 1-Ethyl-3-methylimidazolium Acetate to Partially Depolymerize Lignin at Ambient Temperature and Pressure

Current Approaches for Polyurethane Production from Lignin

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