Catalytic Conversion of Lignins for Valuable Chemicals

Tarabanko, Valery E.

doi:10.3390/catal11101254

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Such lignins are very cheap, but unwanted, since there has been a lack of e cient techniques for their valorization (Kuznetsov et al 2018). The advantages of native lignins over technical lignins have led to the modern concept expressed in two words: «Lignin rst» (Renders et al 2017, Tarabanko 2021. This means that the processing of lignocellulosic biomass should begin with the conversion of lignin into high-demand products.…”

Section: Introductionmentioning

confidence: 99%

Modification of Aspen Wood Ethanol Lignin via Azo Coupling; Promising Polymers from Renewable Plant Biomass

Golubkov,

Borovkova,

Lutoshkin

et al. 2024

Preprint

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Plant biomass, in particular forestry wastes, is and promising renewable feedstock for deep chemical processing. Organosolv methods allow the use of underutilized lignin. The synthesis of modified polymers by azo coupling with the use of aspen (Populus tremula) ethanol lignin and its sulfated modification is studied. The success of the synthesis has been proven and the features of the structure and properties of the synthesized samples were studied by the physicochemical techniques, including Fourier-transform infrared and nuclear magnetic resonance spectroscopy, gel permeation chromatography and thermogravimetric analysis. It is shown that the new azopolymers have the ability to photoisomerize, which opens up prospects for their high-tech applications. The modified lignins are proven to be bioactive antioxidants.

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Section: Introductionmentioning

confidence: 99%

Modification of Aspen Wood Ethanol Lignin via Azo Coupling; Promising Polymers from Renewable Plant Biomass

Golubkov,

Borovkova,

Lutoshkin

et al. 2024

Preprint

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“…have a high degree of condensation and low reactivity, and therefore they are almost never used in production of chemicals. The advantages of native lignins for the production of monomeric aromatic compounds compared to technical ones have led to a modern concept, expressed in two words: "Lignin first" [4,5]. That is, processing the lignocellulosic raw materials should begin from the conversion of lignin into valuable and in-demand products.…”

Section: Introductionmentioning

confidence: 99%

Chemical Processing of Agriculture Wastes Into Vanillin, Pulp and Glucose

Golubkov,

Tarabanko,

Kaygorodov

et al. 2023

JCPRM

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Agrotechnical wastes from processing herbaceous plants consist of lignin and polysaccharides, which can be processed into monomers – phenols and carbohydrates. The prospects of chemical processing of several agrotechnical waste types with a high lignin content (flax shives, sunflower seed husks and buckwheat husks) into vanillin, pulp, and glucose by oxidation and acid hydrolysis were studied. It has been shown that despite the distant phylogenetic relationship of the studied plants, their lignins have a similar structure: they contain a similar amount of methoxyl groups (10–13 wt.% per lignin) and give close yields of aromatic aldehydes upon oxidation with nitrobenzene (17–19%) and oxygen (14–16%). In general, the suitability of agrotechnical wastes for oxidation to aromatic aldehydes determines by the lignin content. Among the studied wastes, flax shives are the most promising feedstock for chemical processing into vanillin and glucose. Cellulose-containing solid residues of oxidation process are more easily hydrolyzed compared to the initial lignocellulosic biomass. The inversion of glucose oligomers during the hydrolysis of cellulose with H2SO4 is limited by the hydrolysis of the tetra- and octamers.

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“…The industrial processing of lignin is complicated by its nature and strong structural and functional heterogeneity predetermined by a chosen raw material and production conditions [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Sulfation of Wheat Straw Soda Lignin with Sulfamic Acid over Solid Catalysts

et al. 2022

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Soda lignin is a by-product of the soda process for producing cellulose from grassy raw materials. Since a method for the industrial processing of lignin of this type is still lacking, several research teams have been working on solving this problem. We first propose a modification of soda lignin with sulfamic acid over solid catalysts. As solid catalysts for lignin sulfation, modified carbon catalysts (with acid sites) and titanium and aluminum oxides have been used. In the elemental analysis, it is shown that the maximum sulfur content (16.5 wt%) was obtained with the Sibunit-4® catalyst oxidized at 400 °C. The incorporation of a sulfate group has been proven by the elemental analysis and Fourier-transform infrared spectroscopy. The molecular weight distribution has been examined by gel permeation chromatography. It has been demonstrated that the solid catalysts used in the sulfation process causes hydrolysis reactions and reduces the molecular weight and polydispersity index. It has been established by the thermal analysis that sulfated lignin is thermally stabile at temperatures of up to 200 °C. According to the atomic force microscopy data, the surface of the investigated film consists of particles with an average size of 50 nm. The characteristics of the initial and sulfated β-O-4 lignin model compounds have been calculated and recorded using the density functional theory.

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Catalytic Conversion of Lignins for Valuable Chemicals

Abstract: Modern civilization is moving from fossil sources of raw materials and, consequently, energy to renewable resources: plant raw materials and solar and wind energy [...]

Cited by 6 publications

References 12 publications

Modification of Aspen Wood Ethanol Lignin via Azo Coupling; Promising Polymers from Renewable Plant Biomass

Modification of Aspen Wood Ethanol Lignin via Azo Coupling; Promising Polymers from Renewable Plant Biomass

Chemical Processing of Agriculture Wastes Into Vanillin, Pulp and Glucose

Sulfation of Wheat Straw Soda Lignin with Sulfamic Acid over Solid Catalysts

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