A5036364150- Lignin and Wood Chemistry
- Advanced Cellulose Research Studies
- Enzyme-mediated dye degradation
- Biofuel production and bioconversion
- Catalysis for Biomass Conversion
- Dyeing and Modifying Textile Fibers
- Biodiesel Production and Applications
- Catalysis and Hydrodesulfurization Studies
- Polysaccharides Composition and Applications
- Enzyme Structure and Function
- Polysaccharides and Plant Cell Walls
- Thermal and Kinetic Analysis
- Thermochemical Biomass Conversion Processes
- Enzyme Catalysis and Immobilization
Institute of Chemistry and Chemical Technology
2015-2023
Krasnoyarsk Scientific Center
2020-2023
Russian Academy of Sciences
2020-2023
Siberian Branch of the Russian Academy of Sciences
2015-2021
Spruce (Piceaabies) wood hemicelluloses have been obtained by the noncatalytic and catalytic oxidative delignification in acetic acid-water-hydrogen peroxide medium a processing time of 3–4 h temperatures 90–100 °C. In process, H2SO4, MnSO4, TiO2, (NH4)6Mo7O24 catalysts used. A polysaccharide yield up to 11.7 wt% has found. The hemicellulose composition structure studied complex physicochemical methods, including gas gel permeation chromatography, Fourier-transform infrared spectroscopy,...
We report on the kinetics of pyrolysis bark wood four coniferous tree species: fir (Abies sibirica), larch (Larix spruce (Picea obovata), and cedar (Pinus sibirica) denoted as FB, LB, SB, CB, respectively. Thermogravimetry (TG) differential scanning calorimetry (DSC) methods were used to study influence KCl K3PO4 compounds process thermal decomposition determine main effects accompanying this process. As a result studies carried out, it was found that additives practically do not affect...
In this study, hemicelluloses of aspen wood (Pópulus trémula) were obtained by oxidative delignification in an acetic acid-water-hydrogen peroxide medium at temperatures 70-100 °C and a process time 1-4 h. The maximum polysaccharide yield up to 9.68 wt% was reported. composition structure the studied using complex physicochemical methods: gas gel permeation chromatography, Fourier-transform infrared spectroscopy, 2D nuclear magnetic resonance thermogravimetric analysis. xylose, mannose,...
A new approach is being considered for obtaining microfibrillated cellulose with a low degree of polymerization by sulfuric acid hydrolysis simultaneous ultrasonic treatment under mild conditions (temperature 25 °C, 80% power control). Samples initial cellulose, MCC, and MFC were characterized FTIR, XRF, SEM, DLS, TGA. It was found that high yield (86.4 wt.%) SP (94) are observed during 90 min. shown the resulting retains structure I has an IC 0.74. particles network fibrils average size...
Hydrogenation of flax shives in ethanol over bifunctional Ni/C catalysts at 225 °C has been studied. It shown that the 10% catalyst enhances yield monomeric products from 1.1 to 9.7 wt %, decreases solid product content 45 35 and increases degree delignification 91%. The main compounds obtained during hydrogenation are propyl guaiacol propenyl guaiacol. established an increase mass transfer intensity via increasing stirring rate or decreasing grain size leads total propanol yield. Alkaline...
The effect of a bifunctional catalyst containing nano-dispersed ruthenium particles on an oxidized carbon support “Sibunit” the yield and composition products in processes hydrogenation abies wood ethanol-lignin supercritical ethanol medium at 250° C was studied. presence Ru/C resulted raise conversion from 85 to 98 wt.%, liquid product 75 gases – by 1.5 times, but solid dropped 14 2.8 wt.%.
 Ruthenium increased 12.5 did not affect products. residue reduced rose 2.5 times.
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The influence of sulfuric acid catalyst concentration on hydrolysis birch wood hemicelluloses under mild conditions (temperature 100 °С and atmospheric pressure) was studied.It found that the maximum yield xylose (72,4-77,1 % wt. initial content in birch) is achieved at a H 2 SO 4 2-3 by weight process duration 5 hours.According to gas chromatographic analysis obtained hydrolysates contain mainly xylose, minor amounts mannose glucose.The solid products cellulose (56,8-70,4 wt.), lignin...
A new method for extractive-catalytic fractionation of aspen wood to produce microcrystalline (MCC), microfibrillated (MFC), nanofibrilllated (NFC) celluloses, xylan, and ethanollignin is suggested in order utilize all the main components biomass. Xylan obtained with a yield 10.2 wt.% via aqueous alkali extraction at room temperature. Ethanollignin was 11.2 60% ethanol from xylan-free 190 °C. The lignocellulose residue formed after xylan subjected catalytic peroxide delignification acetic...
The known methods to obtain microcrystalline cellulose (MCC) from wood raw material is multi-stage and it based on the integration of environmentally hazardous processes pulping, bleaching acid hydrolysis amorphous part. paper describes a one-stage catalytic method pine peroxide delignification in acetic acid-water presence catalyst H2SO4. optimal parameters process 2% H2SO4 were determined by experimental numerical methods: temperature – 100 °C, concentration H2O2 5 wt.%, CH3COOH 25 LWR 15,...
The experimental and mathematical optimization of abies wood peroxide delignification process in the formic acid – water medium presence TiO₂ catalyst was carried out. It established that temperature range 70-100 °С rate constants vary between 0.4 3.2 · 10-4 min-1. optimal parameters for production cellulose product with a residual lignin content ≤ 3 wt.% were determined (temperature 100 °С, concentration Н₂О₂ 10 wt.%, НCOOН 38 LWR 15, time 4 h). features processes “ water” “acetic compared....
Experimental and mathematical methods were used to obtain the optimal parameters of peroxide delignification larch in presence MnSO4 catalyst, which provide a high yield cellulose (44.3 wt.%) with low content residual lignin: temperature 100 °C, H 2 O 6 wt.%, CH 3 COOH 25 hydromodulus 15, duration h. The produced under conditions had following chemical composition: 92.7 lignin 0.6 hemicellulose 5.7 wt.%. IR spectroscopy XRD studies revealed that structure from is similar industrial...
The possibility of isolation high-quality cellulose by peroxide delignification birch wood in an acetic acid-water medium the presence a TiO2 catalyst at temperature 100 °C was shown. influence process conditions (concentration hydrogen and acid, liquid/wood ratio (LWR)) on yield composition products established. Numerical optimization carried out using full factorial experiment. optimal for from product with residual lignin content ≤ 1 wt.% are: СН3СООН concentration 23.8 wt.%, Н2О2 4.9...