Results 181 to 190 of about 17,378 (210)

The Kinetics of Oxygen Delignification of Reed Kraft Pulp (I)-Kinetics of Delignification

Advanced Materials Research, 2011
The kinetics of reed kraft pulp oxygen delignification process is studied, suitable kinetics model determined is -dk/dt=Aexp(-E/RT) [OH-]b[PO2]cKa, and the parameters in the model is calculated. The function for estimation of the kappa number at different reaction time is established for the reed kraft pulp oxygen delignification process.
Xiao Feng Pan, Le Fan Ma, Qin Qin Qu, Jia Liang Lan, Li Hong Tan   +4 more
openaire   +1 more source

Xylanase effects on pulp delignification

Chemical Engineering Communications, 2002
Xylanase 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
openaire   +1 more source

Gas dispersion in the oxygen delignification process

TAPPI Journal, 2021
There 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, HEIKKI MUTIKAINEN, KARI PELTONEN, RIKU KOPRA, MARKUS HONKANEN   +4 more
openaire   +2 more sources

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.
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +2 more sources

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).
openaire   +2 more sources

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
openaire   +2 more sources

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].
openaire   +1 more source