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Surface reinforcement of rice straw fibers for epoxy composites by ultrasonic, plasma, and sodium carbonate-assisted hybrid treatments. [PDF]
RSC AdvHarianingsih +9 more
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Advances in Integrated Lignin Valorization Pathways for Sustainable Biorefineries. [PDF]
MoleculesNtunka MG, Vallabh ST.
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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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The role of gas dispersion in the oxygen delignification process
TAPPI Journal, 2021Oxygen 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 +6 more
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The Kinetics of Oxygen Delignification of Reed Kraft Pulp (I)-Kinetics of Delignification
Advanced Materials Research, 2011The 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 +4 more
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Reduced brightness variations by extended oxygen delignification
Nordic Pulp & Paper Research Journal, 2000The 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 +2 more
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Effects of lignin chemistry on oxygen delignification performance
TAPPI Journal, 2018The present work focused on characterizing the chemical and structural properties of isolated lignin from six hardwoods and their kraft pulps in an attempt to better understand the relationship between lignin’s chemical properties and resultant oxygen delignification performance.
Valeria Juste Gomes +5 more
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Study of vanillin formation under oxygen delignification process
2018 IEEE 5th International Conference on Engineering Technologies and Applied Sciences (ICETAS), 2018The production of vanillin during an alkaline oxygen delignification process was evaluated in this study. The degradation of lignin does not directly occur by oxygen but by the active oxygen species (AOS) generated in the system. These AOS occur by the attack of oxygen on the lignin phenolic side-chain leads to the cleavage of the lignin bond.
Napat Viseshsin +4 more
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Nitrogen-Centered Activators of Peroxide-Reinforced Oxygen Delignification
Industrial & Engineering Chemistry Research, 2004In an effort to augment the efficiency of an oxygen delignification stage, we examined the effectiveness of various heterocyclic aromatic nitrogen compounds as possible activators of such a stage. It was shown that a variety of such compounds may act as activators in the presence of hydrogen peroxide, improving the delignification efficiency of oxygen ...
Dimitris S. Argyropoulos +2 more
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