Results 161 to 170 of about 2,238 (210)

Cellulose Nanocrystals and Rice Husk Surface Functionalization Induced by Infrared Thermal Activation. [PDF]

ChemSusChem
D'Orsi R, Danielli C, Spennato M, Guazzelli E, Martinelli E, Asaro F, Gardossi L, Operamolla A.   +7 more
europepmc   +1 more source

Fabrication of Magnetically and Photothermally Functionalized Materials Based on Corn Stalk Pith Framework for Oil-Water Separation. [PDF]

Polymers (Basel)
Cui Y, Shu X, Cui B, Ding J, Dai W, Yang C, Wang W.   +6 more
europepmc   +1 more source

Modelling of real oxygen delignification processes

openaire   +1 more source

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   +2 more sources

Reduced brightness variations by extended oxygen delignification

Nordic Pulp & Paper Research Journal, 2000
The kappa number reduction for softwood kraft pulps in an alkaline environment was studied with and without oxygen present. It was shown that the major part of the kappa number reduction in oxygen delignification stages is due to the reaction chemistry but the importance of effective extraction washing was also proved in experiments with subsequent ...
Camilla Rööst, Per Larsson, Göran Gellerstedt   +2 more
openaire   +2 more sources

Pulp delignification with oxygen and copper(II)-polyimine complexes

Holzforschung, 2013
Abstract Ten Cu(II)-polyimine complexes were tested as potential catalysts in oxygen delignification of softwood kraft pulps. The ligands were chosen from the terpyridine and the phenanthroline families, including several neocuproines. One diamine-phenanthrene (daphen) was also investigated.
Gueneau, Basile, Marlin, Nathalie, Deronzier, Alain, Lachenal, Dominique   +3 more
openaire   +3 more sources

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Oxygen Delignification Chemistry and Its Impact on Pulp Fibers

Journal of Wood Chemistry and Technology, 2003
Abstract Two southern pine kraft pulps with kappa numbers of 30.0 (SW1-0) and 48.0 (SW2-0) were oxygen delignified by 30–60% by varying the reaction temperature (78–110°C) and charge of sodium hydroxide (1.6–4.4%). O-bleachability was found to be correlated to the incoming kappa number and charge of sodium hydroxide employed. In general, a lower charge
Lucian A Lucia, Arthur J Ragauskas, Hasan Jameel   +2 more
exaly   +2 more sources

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

The role of gas dispersion in the oxygen delignification process

TAPPI Journal, 2021
Oxygen delignification is an essential part of the pulp production process. Delignification occurs with the aid of alkali and dissolved oxygen. Dissolved oxygen is obtained by dispersing oxygen gas into the pulp suspension by using efficient mixers.
JARI KAYHKO, KARI PELTONEN, HEIKKI MUTIKAINEN, RIKU KOPRA, HANNU ELORANTA, ANNA PESONEN, ADRIAAN VAN HEININGEN   +6 more
openaire   +2 more sources