Results 181 to 190 of about 17,533 (207)

Kinetics of Delignification: A Molecular Approach

Science, 1982
A treelike model has been proposed for the structure of lignin. Kinetics of delignification are formulated to account for the cleavage of linkages along the linear primary chains and at the cross-links. Experimental data obtained from isothermal delignification are used to verify this theory.
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Ozonolytic Delignification of Wheat Straw

Russian Journal of Physical Chemistry A, 2020
The dynamics of wheat straw delignification with ozone treatment is studied. The dependence of the residual lignin content on the specific absorption of ozone is determined. It is found that in a prolonged stage of ozonation, ozone is consumed mostly for the reaction with lignin.
E. M. Ben’ko, D. G. Chukhchin, N. A. Mamleeva, A. N. Kharlanov, V. V. Lunin   +4 more
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Delignification of Miscanthus by Extraction

Separation Science and Technology, 2012
Removal of lignin from miscanthus liberates cellulose and hemicellulose for hydrolysis to obtain sugars that can subsequently be fermented to ethanol or butanol. Extraction of lignin from raw miscanthus at 70°C is feasible when the extracting solvent contains a base (Ethylenediamine, EDA) mixed with an organic solvent or a mildly hydrophobic ionic ...
Sasisanker Padmanabhan, Edmond Zaia, Katherine Wu, Harvey W. Blanch, Douglas S. Clark, Alexis T. Bell, John M. Prausnitz   +6 more
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Delignification of Biomass Using Alkaline Glycerol

Energy Sources, 2005
Ailanthus altissima and Spruce orientalis chips were delignified by using glycerol as a solvent and alkaline-gliycerol with and without catalyst at different temperatures (438, 458, 478, and 498 K) in atmospheric pressure, and results were compared with the other organic solvent systems.
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Delignification by Wood-Decay Fungi

Annual Review of Phytopathology, 1991
Wood decay fungi are unique because of their capacity to decompose lignified cell walls. A few species are of special interest because they can selectively remove lignin from wood without extensive cellulose degradation. Lignin is a complex, heterogeneous phenylpropanoid structural polymer that occurs throughout the cell wall (71, 112).
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BASE-CATALYZED ORGANIC DELIGNIFICATION SYSTEMS

2009
Alkali kraft metodu, günümüzde dünya genelinde en çok kullanılan kimyasal kağıt hamuru üretimi prosesidir. Fakat bu metodun bir çok dezavantajı bulunmaktadır. Özellikle havayı, suyu ve çevreyi kirletme özelliğindeki kimyasal maddeler kullanılmakta, oldukça yüksek yatırım ve işletme maliyetini gerektirmektedir.
ŞAHİN, H., ÜNER, Birol
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Biological Delignification Of Biomass

2016
The annual production of lignocellulosic matters has been estimated about, 1010 metric tons worldwide [2]. The main constituents of the lignocellulosic biomass are cellulose (a homopolymer of glucose), hemicellulose (a heteropolymer of pentoses and hexoses) and lignin (a polymer of phenyl propanoid units) [82].
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Delignification of softwood by ozonation

Pure and Applied Chemistry, 2009
Ozonation of aspen sawdust of various moisture content (MC) values was investigated. Ozone consumption corresponding to the completion of the ozonation process was shown to be governed by the wood MC. Cellulose-containing material of a low (1–3 %) residual lignin content (LC) was produced under ozonation. It is proposed that ozone dissolved in water is
Nadezhda A. Mamleeva, Stanislav A. Autlov, Natal’ya G. Bazarnova, Valery V. Lunin   +3 more
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Oxidative Delignification of Flax Fiber

Russian Journal of Applied Chemistry, 2003
Oxidative delignification of flax fiber at 98°C was studied. The intermediate material was produced in moderate yield with high degree of delignification. The optimum conditions of the process were determined.
S. N. Petrova, I. Yu. Volkova, A. G. Zakharov   +2 more
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Modelling of biomass fractionation by prehydrolysis-delignification

Chemical Engineering Science, 1988
Abstract A two-stage process is investigated as a potential fractionation method for barley straw biomass. Modeling of dilute-acid prehydrolysis shows that hemicellulose saccharification rate is controlled by chemical reaction; in the case of delignification of the prehydrolyzed residue by high-consistency clorination, the rate-controlling step is ...
Gy. Marton, M. Kovacs, V. Oreopoulou, E.G. Koukios   +3 more
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