Electrochemical extraction of methanol from lignin under mild conditions

Hibino, Takashi; Kobayashi, Kazuyo; Zhou, Dongwen; Chen, Siyuan; Zinchenko, Anatoly; Teranishi, Shinya; Miyawaki, Aki; Sawada, Yoshiharu

doi:10.1016/j.apcatb.2023.123328

“…Electrochemical ODM under ambient pressure at 75 °C of sodium lignosulfonate (with 8.7 wt % Ar−OMe) in 85 % aqueous H 3 PO 4 was reported to produce CH 3 OH with 41.5 % yield and 95 % faradaic efficiency [154] …”

Section: Odm Of Ortho‐methoxyphenolsmentioning

confidence: 99%

“…[153] Electrochemical ODM under ambient pressure at 75 °C of sodium lignosulfonate (with 8.7 wt % ArÀ OMe) in 85 % aqueous H 3 PO 4 was reported to produce CH 3 OH with 41.5 % yield and 95 % faradaic efficiency. [154] Despite the intense research on ODM of technical lignins in recent years, comparison between the different studies is elusive due to the large variety in technical lignins and the reaction conditions. But even with similar lignin substrates and conditions, comparison is difficult due to the variety of analysis techniques, viz.…”

Section: Odm Of Technical Ligninmentioning

confidence: 99%

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Wu,

Smet,

Brandi

et al. 2024

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Lignin represents the largest aromatic carbon resource in plants, holding significant promise as a renewable feedstock for bioaromatics and other cyclic hydrocarbons in the context of the circular bioeconomy. However, the methoxy groups of aryl methyl ethers, abundantly found in technical lignins and lignin‐derived chemicals, limit their pertinent chemical reactivity and broader applicability. Unlocking the phenolic hydroxyl functionality through O‐demethylation (ODM) has emerged as a valuable approach to mitigate this need and enables further applications. In this review, we provide a comprehensive summary of the progress in the valorization of technical lignin and lignin‐derived chemicals via ODM, both catalytic and non‐catalytic reactions. Furthermore, a detailed analysis of the properties and potential applications of the O‐demethylated products is presented, accompanied by a systematic overview of available ODM reactions. This review primarily focuses on enhancing the phenolic hydroxyl content in lignin‐derived species through ODM, showcasing its potential in the catalytic funneling of lignin and value‐added applications. A comprehensive synopsis and future outlook are included in the concluding section of this review.

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Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Wu,

Smet,

Brandi

et al. 2024

Angewandte Chemie

1

0

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Lignin represents the largest aromatic carbon resource in plants, holding significant promise as a renewable feedstock for bioaromatics and other cyclic hydrocarbons in the context of the circular bioeconomy. However, the methoxy groups of aryl methyl ethers, abundantly found in technical lignins and lignin‐derived chemicals, limit their pertinent chemical reactivity and broader applicability. Unlocking the phenolic hydroxyl functionality through O‐demethylation (ODM) has emerged as a valuable approach to mitigate this need and enables further applications. In this review, we provide a comprehensive summary of the progress in the valorization of technical lignin and lignin‐derived chemicals via ODM, both catalytic and non‐catalytic reactions. Furthermore, a detailed analysis of the properties and potential applications of the O‐demethylated products is presented, accompanied by a systematic overview of available ODM reactions. This review primarily focuses on enhancing the phenolic hydroxyl content in lignin‐derived species through ODM, showcasing its potential in the catalytic funneling of lignin and value‐added applications. A comprehensive synopsis and future outlook are included in the concluding section of this review.

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Electro-depolymerization of Kraft lignin with deep eutectic solvents

Ceylan,

Gürler-Akyüz,

Kurt

et al. 2024

Wood Sci Technol

0

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The paper production industry annually produces approximately 50 million tons of lignin, an intermediate product. While lignin has the potential for producing valuable chemicals and energy materials, an effective method for its conversion is yet to be developed. This study aims to establish a sustainable and environmentally friendly approach for electrochemically synthesizing valuable compounds from lignin with using natural deep eutectic solvents as electrolytes. The study used cyclic voltammetry (CV) for the electrochemical depolymerization of Kraft lignin, examining the effects of different scan numbers on depolymerization and the resulting lignin derivatives. Observed changes in the depolymerization peak current of lignin were reported as the number of scans increased. Choline chloride: Lactic acid (CC:LA), Choline chloride: Ethylene glycol (CC:EG), and Lactic acid:1,2-propanediol (LA:PR) were used as green electrolytes. Syringaldehyde was found to be the major compound obtained by this method. As a result of statistical analysis performed using The Grey Relations Analysis method, it was determined that the conditions that utilized Kraft lignin with the highest added value involved performing five cycles of CV scans with the CC:LA electrolyte. CV scans in DES environments increased the yield of lignin-derived phenolic compounds.

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Electrochemical extraction of methanol from lignin under mild conditions

Cited by 3 publications

References 68 publications

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Electro-depolymerization of Kraft lignin with deep eutectic solvents

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