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Using cavitation for delignification of wood
Bioresource Technology, 2012The Kraft process is the most widely used chemical process for the removal of lignin and other polymers from wood to obtain cellulosic pulp fibres. In the present study, the effect of cavitation (growth and violent collapse of vapour bubbles in a liquid) on delignification of wood was investigated.
Aniruddha B Paṇḍit
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Gas dispersion in the oxygen delignification process
TAPPI Journal, 2021There has been very little knowledge about the state of gas dispersion in the oxygen delignification process, even though this has a major impact on the performance of the reactor. This paper presents a new continu-ous inline method for measuring oxygen bubble size distribution in the reactor, as well as results from studies con-ducted in softwood and ...
JARI KAYHKO +4 more
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Advances in microbial delignification
Biotechnology Advances, 1984Microbial delignification is a new field of applied research. The progress will therefore run parallel to the development of new basic knowledge on the physiological demands of white-rot fungi to degrade lignin and on new knowledge on enzyme mechanisms involved in lignin degradation.
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Delignification of Miscanthus by Extraction
Separation Science and Technology, 2012Removal 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 +6 more
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Delignification of softwood by ozonation
Pure and Applied Chemistry, 2009Ozonation 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 +3 more
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Modelling of biomass fractionation by prehydrolysis-delignification
Chemical Engineering Science, 1988Abstract 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 +3 more
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Kinetics of Delignification: A Molecular Approach
Science, 1982A 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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Selective solvent delignification for fermentation enhancement
Biotechnology and Bioengineering, 1983AbstractCellulose and hemicellulose in renewable biomass resources such as cornstover and wheat straw have been examined as substrates for the production of ethanol. A mixed culture of selected strains of Clostridium thermocellum and Clostridium thermosaccharolyticum are used to accomplish both the hydrolysis and fermentation of these carbohydrates in ...
G C, Avgerinos, D I, Wang
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Xylanase effects on pulp delignification
Chemical Engineering Communications, 2002Xylanase effects on softwood pulp delignification were investigated experimentally and using mathematical models. The effect of xylanase molecular size on pulp delignification was investigated. As xylanase molecular weight decreased from 67 kDaltons to 20 kDaltons, lignin removal from pulp increased from 30 wt% to 48 wt%, respectively.
David Whitmire, Biswajit Maiti
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THE MECHANISM OF THE ALKALINE DELIGNIFICATION OF WOOD
Canadian Journal of Research, 1941Measurement was made of the rate of delignification of sprucewood with lithium, barium, sodium, potassium, and tetra-ethyl ammonium hydroxides under closely controlled conditions of temperature and concentration. The reaction rates were compared with the ionic mobilities and adsorption coefficients of the different alkalis.
G. L. Larocque, O. Maass
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