Influence of mass transfer and acid prehydrolysis on the process of flax shives catalytic oxidation into vanillin and pulp

Tarabanko, Valery E.; Vigul, Dmitry O.; Kaygorodov, Konstantin L.; Kosivtsov, Yu. Yu.; Tarabanko, Nikolay; Chelbina, Yulia V.

doi:10.1007/s13399-022-02366-8

Cited by 7 publications

(26 citation statements)

References 23 publications

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“…These dependences coincide with the earlier-obtained and recommended models for the description of mass transfer in gas-liquid systems [21,22]. These models explain the overall process rate limitation via the rate of oxygen diffusion through the liquid near-surface region at the gas-liquid phase boundary and are often interpreted as examples of a more general model The authors of [19,20] proposed the first quantitative model for the influence of mass transfer intensity on the rates of oxygen consumption and vanillin accumulation. This study was complicated by the presence of mucilage in the flax shives and via the formation of gels in the aqueous phase.…”

Section: Introductionsupporting

confidence: 84%

“…The authors of [19,20] proposed the first quantitative model for the influence of mass transfer intensity on the rates of oxygen consumption and vanillin accumulation. This study was complicated by the presence of mucilage in the flax shives and via the formation of gels in the aqueous phase.…”

Section: Introductionmentioning

confidence: 99%

“…This study was complicated by the presence of mucilage in the flax shives and via the formation of gels in the aqueous phase. This complication was mostly overcome by acid prehydrolysis of the shives [19]. It was shown that the oxidation of the shives at 160 • C is described via linear dependences of the oxygen consumption and the vanillin accumulation rate logarithms versus the logarithm of the stirring speed:…”

Section: Introductionmentioning

confidence: 99%

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Mass Transfer in the Processes of Native Lignin Oxidation into Vanillin via Oxygen

Tarabanko,

Kaygorodov,

Kazachenko

et al. 2023

Catalysts

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The influence of mass transfer intensity on the kinetics of the catalytic oxidation of flax shives with oxygen in alkaline media to aromatic aldehydes and pulp was studied. The process was carried out in two autoclaves, with moderate stirring (stirrer engine of 8 W) and intense stirring (stirrer engine of 200 W). The oxidation of flax shives into vanillin, syringaldehyde, and pulp was shown to proceed as a completely diffusion-controlled process under the studied conditions, both moderate and intense stirring. Depending on the process conditions, it can be limited by stages of oxygen transfer through the diffusion boundary layer near the gas–liquid interface (low intensity of mass transfer) as well as by reagents’ inner diffusion in the porous and solid matter of the flax shive particle (high intensity of mass transfer). The results on the influence of the stirring speed and volume of the reaction mass on the rates of oxygen consumption and vanillin accumulation were obtained. They were described using a known simple model connecting the intensity of mass transfer and the stirring power density in the bulk of the liquid phase in terms of algebra equations.

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Section: Introductionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mass Transfer in the Processes of Native Lignin Oxidation into Vanillin via Oxygen

Tarabanko,

Kaygorodov,

Kazachenko

et al. 2023

Catalysts

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“…Study of the component and functional composition of lignocellulose biomass. It was reported previously that flax, sunflower and buckwheat processing wastes have a high lignin content [10,12,30]. Therefore, they are promising substrates for processing into aromatic monomers.…”

Section: Results Of the Research And Discussionmentioning

confidence: 99%

“…The currently developing method of lignin valorization is catalytic oxidation by molecular oxygen (OMO) to obtain hydroxy aldehydes, mainly vanillin and syringaldehyde. They are valuable feedstock for the pharmaceutical, food and perfume industries [12,13]. The oxidative processing of native lignins to obtain aromatic aldehydes, primarily vanillin, has the obvious advantage of a high yield compared to technical, condensed lignins [14].…”

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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Review on the oxidative catalysis methods of converting lignin into vanillin

Zhong

et al. 2023

International Journal of Biological Macromolecules

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Influence of mass transfer and acid prehydrolysis on the process of flax shives catalytic oxidation into vanillin and pulp

Cited by 7 publications

References 23 publications

Mass Transfer in the Processes of Native Lignin Oxidation into Vanillin via Oxygen

Mass Transfer in the Processes of Native Lignin Oxidation into Vanillin via Oxygen

Chemical Processing of Agriculture Wastes Into Vanillin, Pulp and Glucose

Review on the oxidative catalysis methods of converting lignin into vanillin

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