Lignin valorization process control under feedstock uncertainty through a dynamic stochastic programming approach

Bao, Hanxi; Zhou, Zhiqiang; Kotsalis, Georgios; Lan, Guanghui; Tong, Zhaohui

doi:10.1039/c9re00176j

Cited by 5 publications

(1 citation statement)

References 33 publications

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“…The combined catalyst composition, dosage, and other reaction parameters are optimized on the conversion rate of depolymerizing lignin into low-molecular-weight aromatics using the Box-Behnken experimental design [54] and the response surface methodology. [54,55] We elucidate the lignin depolymerization mechanism by the ferrous/persulfate reagent, using the density functional theory (DFT) [56] in the Gaussian program package [57] and experimental data to compare the lignin structures before and after depolymerization.…”

Section: Introductionmentioning

confidence: 99%

Depolymerization of Lignin into Monophenolics by Ferrous/Persulfate Reagent under Mild Conditions

et al. 2020

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This study aimed to use a persulfate together with transition metal ions as the reagent to effectively depolymerize lignin into monophenolic compounds under mild conditions (ambient pressure, temperature <100 °C). The Box‐Behnken experimental design in combination with the response surface methodology was applied to obtain optimized reaction conditions. The results showed that this reagent could depolymerize up to 99 % of lignin dimers to mainly veratraldehyde. This reaction also successfully depolymerized industrial lignins with a high yield of phenolic oils and monophenolic compounds. Quantum chemistry calculations using the density functional theory level indicated that the persulfate free radical attacks Cβ to break the β‐O‐4 bond of lignin through a five‐membered ring mechanism. This mechanism using persulfate free radicals has a lower activation barrier than that using hydroxyl radicals. Gel permeation chromatography and 2D‐NMR spectroscopy demonstrated the effective cleavage of the β‐O‐4 bonds of lignin after depolymerization.

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Section: Introductionmentioning

confidence: 99%