Study of vanillin formation under oxygen delignification process

Viseshsin, Napat; Sukhitkul, Pimwalun; Panyadee, Rangsalid; Sakdaronnarong, Chularat; Posoknistakul, Pattaraporn

doi:10.1109/icetas.2018.8629121

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“…Further, supercritical fluids although provides high selectivity than acid and base-catalyzed reactions, nevertheless supercritical solvents facility limited their applications on biomass treatment in commercial scale [21,22]. Conversion of lignin to vanillin or phenolic aldehydes e.g., p-hydroxybenzaldehyde, vanillaldehyde, syringaldehyde [23], which are used in pharmaceutical application, has been widely studied via mild oxidative reaction that required either air, molecular oxygen [24] or oxidant such as H 2 O 2 [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Lignin-Derived Syringol and Acetosyringone from Palm Bunch Using Heterogeneous Oxidative Depolymerization over Mixed Metal Oxide Catalysts under Microwave Heating

et al. 2021

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Biomass valorization to building block chemicals in food and pharmaceutical industries has tremendously gained attention. To produce monophenolic compounds from palm empty fruit bunch (EFB), EFB was subjected to alkaline hydrothermal extraction using NaOH or K2CO3 as a promotor. Subsequently, EFB-derived lignin was subjected to an oxidative depolymerization using Cu(II) and Fe(III) mixed metal oxides catalyst supported on γ-Al2O3 or SiO2 as the catalyst in the presence of hydrogen peroxide. The highest percentage of total phenolic compounds of 63.87 wt% was obtained from microwave-induced oxidative degradation of K2CO3 extracted lignin catalyzed by Cu-Fe/SiO2 catalyst. Main products from the aforementioned condition included 27.29 wt% of 2,4-di-tert-butylphenol, 19.21 wt% of syringol, 9.36 wt% of acetosyringone, 3.69 wt% of acetovanillone, 2.16 wt% of syringaldehyde, and 2.16 wt% of vanillin. Although the total phenolic compound from Cu-Fe/Al2O3 catalyst was lower (49.52 wt%) compared with that from Cu-Fe/SiO2 catalyst (63.87 wt%), Cu-Fe/Al2O3 catalyst provided the greater selectivity of main two value-added products, syringol and acetosyrigone, at 54.64% and 23.65%, respectively (78.29% total selectivity of two products) from the NaOH extracted lignin. The findings suggested a promising method for syringol and acetosyringone production from the oxidative heterogeneous lignin depolymerization under low power intensity microwave heating within a short reaction time of 30 min.

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