Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Alexander V. Levdansky"'
Autor:
Alexander V. Levdansky, Natalya Yu. Vasilyeva, Yuriy N. Malyar, Alexander A. Kondrasenko, Olga Yu. Fetisova, Aleksandr S. Kazachenko, Vladimir A. Levdansky, Boris N. Kuznetsov
Publikováno v:
Molecules, Vol 27, Iss 19, p 6356 (2022)
For the first time, the process of birch ethanol lignin sulfation with a sulfamic acid-urea mixture in a 1,4-dioxane medium was optimized experimentally and numerically. The high yield of the sulfated ethanol lignin (more than 96%) and containing 7.1
Externí odkaz:
https://doaj.org/article/7764fe8522a04d9c92d5ffdc5627e9ee
Publikováno v:
Journal of Siberian Federal University. Chemistry. 14:325-336
Sulfation of birch wood xylan in 1,4-dioxane by sulfamic acid in the presence of urea at 90 and 100 °C was studied for the first time. The effect of the duration of xylan sulfation on the yield of xylan sulfates and the sulfur content in them was st
Publikováno v:
Journal of Siberian Federal University. Chemistry. :263-275
The analysis of the latest publications on the use of hydrolytic lignin, which is a large-tonnage waste of wood chemical processing, was carried out. In its original form, the hydrolytic lignin is used as fuel, fuel briquettes and pellets, binders an
Autor:
Alexander S. Kazachenko, Irina V. Korolkova, Maxim A. Lutoshkin, Galina P. Skvortsova, Nikolai G. Maximov, Alexander V. Levdansky, Boris N. Kuznetsov, Natalia Yu. Vasilyeva
Publikováno v:
Journal of Siberian Federal University. Chemistry. :142-152
For the first time water soluble copper-containing polymers based on sulfated ethanol lignin of abies wood were obtained by the method of ion exchange. Their composition and structure were studied with the use of elemental and chemical analysis, infr
Publikováno v:
Journal of Siberian Federal University. Chemistry. :604-613
The process of proanthocyanidins isolation from abies bark by water and water-alcohol solutions containing 5, 10, 15 and 20 % ethanol was studied for the first time. The optimal conditions providing the maximum yield of proanthocyanidins were determi
Autor:
Boris N. Kuznetsov, Vladimir A. Levdansky, Yuriy N. Malyar, Alexander V. Levdansky, Alexander A. Kondrasenko
Publikováno v:
Journal of Siberian Federal University. Chemistry. :201-220
The analysis of the literature on the spectral methods of lignins study was carried out. The most suitable spectral methods for elucidating the structural features of soluble organosolv lignins were selected. The possibilities of FTIR, 1Н NMR, 13С
Autor:
Boris N. Kuznetsov, Alexander V. Levdansky, Vladimir A. Levdansky, N. V. Garyntseva, Svetlana A. Kuznetsova, Irina G. Sudakova
Publikováno v:
European Journal of Wood and Wood Products. 76:999-1007
A new method to obtain cellulose sulfates from available and inexpensive raw material—aspen wood was developed. This method integrates catalytic peroxide delignification and sulfamic acid sulfation stages. Solvents such as acetic acid and water wer
Autor:
A. V. Pestunov, Lyudmila I. Grishechko, Svetlana A. Kuznetsova, Boris N. Kuznetsov, Alexander V. Levdansky, Alan Celzard, Alexander S. Kazachenko, Yuriy N. Malyar
Publikováno v:
Journal of Siberian Federal University. Chemistry. 9:454-482
Publikováno v:
Journal of Siberian Federal University. Chemistry. 9:337-344
Publikováno v:
Journal of Siberian Federal University. Chemistry. 9:119-133
Composition and structure of microcrystalline cellulose (MCC) sulfates obtained by traditional and new advanced methods of MCC sulfation were compared. Data on the composition and structure of MCC sulfates synthesized in the medium of chlorosulfonic