Effects of phenolic hydroxyl functionality on lignin pyrolysis over zeolite catalyst

Kim, Jae‐Young; Heo, Sujung; Choi, Joon Weon

doi:10.1016/j.fuel.2018.05.133

Cited by 51 publications

(19 citation statements)

References 44 publications

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“…If the Ar-OH is blocked by other groups, lignin cannot form quinone methide intermediates, which reduces repolymerization reactions. Even under pyrolysis conditions, selective methylation of Ar-OH enhances the production of aromatic hydrocarbon and inhibits secondary undesirable reactions (Kim J. Y et al, 2018). Ethanol is also found to be an effective reagent in suppressing char formation.…”

Section: Structural Modification Of Ligninmentioning

confidence: 99%

Recent Efforts to Prevent Undesirable Reactions From Fractionation to Depolymerization of Lignin: Toward Maximizing the Value From Lignin

Kim

2018

Front. Energy Res.

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Lignin is a major component of lignocellulosic biomass along with cellulose and hemicellulose, currently underutilized with the bulk of technical lignin being combusted for heat generation in plant. From the technoeconomic perspective, the success of a future biorefinery is highly dependent on lignin valorization. However, structural complexity, heterogeneity of lignin, and several undesirable reactions associated with the nature of lignin and process conditions obstruct the effective utilization of lignin. Lignin condensation has been a long-lasting problem from conventional to recent biorefineries, which makes the recovered lignin more difficult to decompose. Also, the undesirable condensation and repolymerization during the depolymerization of lignin is more problematic as this significantly limits its ability to be depolymerized to low molecular weight products at high yields. To solve this problem, which ultimately enables maximizing lignin utilization, there have been many efforts in various aspects. In this review, we focus on the undesirable reactions occurring during the fractionation and depolymerization process of lignin and introduce recent efforts to suppress or minimize those unwanted reactions. The aim of all these efforts is to maximize lignin conversion to low molecular weight products.

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Section: Structural Modification Of Ligninmentioning

confidence: 99%

Recent Efforts to Prevent Undesirable Reactions From Fractionation to Depolymerization of Lignin: Toward Maximizing the Value From Lignin

Kim

2018

Front. Energy Res.

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“…Chemoselective methylation of AL was conducted to block the phenolic hydroxyl group [ 14 ]. First, 1.6 g of AL was dissolved in 80 mL of aqueous 0.7 M sodium hydroxide at 25 °C.…”

Section: Methodsmentioning

confidence: 99%

Phenolic Hydroxyl Groups in the Lignin Polymer Affect the Formation of Lignin Nanoparticles

et al. 2021

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Alkaline soda lignin (AL) was sequentially fractionated into six fractions of different molecular size by means of solvent extraction and their phenolic hydroxyl groups were chemoselectively methylated to determine their effect on nanoparticle formation of lignin polymers. The effect of the lignin structure on the physical properties of nanoparticles was also clarified in this study. Nanoparticles were obtained from neat alkaline soda lignin (ALNP), solvent-extracted fractions (FALNPs, i.d. 414–1214 nm), and methylated lignins (MALNPs, i.d. 516–721 nm) via the nanoprecipitation method. Specifically, the size properties of MALNPs showed a high negative correlation (R2 = 0.95) with the phenolic hydroxyl group amount. This indicates that the phenolic hydroxyl groups in lignin could be influenced on the nucleation or condensation during the nanoprecipitation process. Lignin nanoparticles exhibited high colloidal stability, and most of them also showed good in vitro cell viability. This study presents a possible way to control nanoparticle size by blocking specific functional groups and decreasing the interaction between hydroxyl groups of lignin.

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“…Lignin comprises three different types of phenylpropane structural units connected by C-O-C bonds and C-C bonds. It is difficult to be degraded as the cross-networking structure [28]. The degradation temperature of the pure lignin is 350-400°C during the HTL process.…”

Section: Interactive Effects Of the Components On The Bio-oil Yieldmentioning

confidence: 99%

Interactions of the Main Components in Paper‐Plastic‐Aluminum Complex Packaging Wastes during the Hydrothermal Liquefaction Process

Wang

Zhu

et al. 2021

Chem Eng & Technol

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Hydrothermal liquefaction was applied to treat paper-plastic-aluminum (Al-PE-Pa) complex packaging waste for bio-oil production. The interactive effects between the main components of paper fiber, low-density polyethylene (LDPE), and aluminum foil in such complex material were studied. The co-liquefaction of paper fiber and LDPE had a significant synergistic effect. The addition of hydrogen-rich LDPE effectively promoted the removal of oxygen-containing groups. Aluminum foil had only a slight impact on the liquefaction of paper fiber, but it can significantly decrease the oxygen content of the bio-oil, increase the high heating value of the bio-oil, and significantly reduce the ester and phenol contents in the biooil. The co-liquefaction of paper fiber/LPDE/aluminum foil exhibited superimposed effects of paper-plastic synergy and in-situ hydrogenation of Al-H 2 O reaction. A new pathway for the energy utilization of Al-PE-Pa complex packaging waste is provided.

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Effects of phenolic hydroxyl functionality on lignin pyrolysis over zeolite catalyst

Cited by 51 publications

References 44 publications

Recent Efforts to Prevent Undesirable Reactions From Fractionation to Depolymerization of Lignin: Toward Maximizing the Value From Lignin

Recent Efforts to Prevent Undesirable Reactions From Fractionation to Depolymerization of Lignin: Toward Maximizing the Value From Lignin

Phenolic Hydroxyl Groups in the Lignin Polymer Affect the Formation of Lignin Nanoparticles

Interactions of the Main Components in Paper‐Plastic‐Aluminum Complex Packaging Wastes during the Hydrothermal Liquefaction Process

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