Kinetics of Vanillin Production from Kraft Lignin Oxidation

1996 ◽  
Vol 35 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Claire Fargues ◽  
Álvaro Mathias ◽  
Alírio Rodrigues
Keyword(s):  
Kraft Lignin ◽  
Lignin Oxidation ◽  
Kinetics Of

Kinetics of softwood kraft lignin inert and oxidative thermolysis

2018 ◽  
Vol 109 ◽  
pp. 239-248 ◽  
Author(s):  
Samira Lotfi ◽  
Roozbeh Mollaabbasi ◽  
Gregory S. Patience
Keyword(s):  
Kraft Lignin ◽  
Softwood Kraft Lignin ◽  
Kinetics Of

Crystallization of vanillin from kraft lignin oxidation

2020 ◽  
Vol 247 ◽  
pp. 116977 ◽  
Author(s):  
E.D. Gomes ◽  
A.E. Rodrigues
Keyword(s):  
Kraft Lignin ◽  
Lignin Oxidation

scholarly journals The kinetics of chromium(VI) adsorption from water on some natural materials

2002 ◽  
pp. 101-108 ◽  
Author(s):  
Marina Sciban ◽  
Mile Klasnja
Keyword(s):  
Analytical Data ◽  
Kraft Lignin ◽  
Order Kinetic ◽  
Freundlich Model ◽  
First Order ◽  
Wood Sawdust ◽  
Chromium Vi ◽  
Order Kinetic Model ◽  
Kinetics Of ◽  
Best Fit

This paper is concerned with the kinetics of chromium(VI) adsorption by wood sawdust, pulp, and Kraft lignin. In our previous works we determined adsorption efficiency of these adsorbents. In this paper we focused our attention on the influence of contact time on chromium(VI) adsorption from water by the same adsorbents. The analytical data were approached from the following kinetic models: First-order kinetic model, Parabolic diffusion model, Elovich model, and Modified Freundlich model. Elovich model was shown to be the best fit for the description of chromium(VI) adsorption. It was found that adsorption was the fastest on pulp and slowest on Kraft lignin.

H2O2-Mediated Kraft Lignin Oxidation with Readily Available Metal Salts: What about the Effect of Ultrasound?

2015 ◽  
Vol 54 (22) ◽  
pp. 6046-6051 ◽  
Author(s):  
François Napoly ◽  
Nathalie Kardos ◽  
Ludivine Jean-Gérard ◽  
Catherine Goux-Henry ◽  
Bruno Andrioletti ◽  
...  
Keyword(s):  
Kraft Lignin ◽  
Metal Salts ◽  
Lignin Oxidation

Recovery of vanillin from Kraft lignin oxidation by ion-exchange with neutralization

2007 ◽  
Vol 55 (1) ◽  
pp. 56-68 ◽  
Author(s):  
M. Zabkova ◽  
E.A. Borges da Silva ◽  
A.E. Rodrigues
Keyword(s):  
Ion Exchange ◽  
Kraft Lignin ◽  
Lignin Oxidation

Mechanistic studies of milled and Kraft lignin oxidation by radical species

2020 ◽  
Vol 22 (4) ◽  
pp. 1182-1197 ◽  
Author(s):  
Maryam Davaritouchaee ◽  
William C. Hiscox ◽  
Evan Terrell ◽  
Rock J. Mancini ◽  
Shulin Chen
Keyword(s):  
Lignin Degradation ◽  
Kraft Lignin ◽  
Mechanistic Studies ◽  
Scientific Interest ◽  
Radical Species ◽  
Lignin Oxidation

Accomplishing selective lignin degradation in a controlled manner by breaking C–O and C–C bonds is of great scientific interest although technically challenging.

Direct observations of radiation-enhanced transformations in glass

1983 ◽  
Vol 41 ◽  
pp. 354-355
Author(s):  
J. F. DeNatale ◽  
D. G. Howitt
Keyword(s):  
Glass Matrix ◽  
Diffusion Mechanism ◽  
Bubble Formation ◽  
Silicate Glasses ◽  
Phase Decomposition ◽  
Direct Observations ◽  
Thin Foils ◽  
Oxygen Bubble ◽  
Electron Energy Loss ◽  
Kinetics Of

The electron irradiation of silicate glasses containing metal cations produces various types of phase separation and decomposition which includes oxygen bubble formation at intermediate temperatures figure I. The kinetics of bubble formation are too rapid to be accounted for by oxygen diffusion but the behavior is consistent with a cation diffusion mechanism if the amount of oxygen in the bubble is not significantly different from that in the same volume of silicate glass. The formation of oxygen bubbles is often accompanied by precipitation of crystalline phases and/or amorphous phase decomposition in the regions between the bubbles and the detection of differences in oxygen concentration between the bubble and matrix by electron energy loss spectroscopy cannot be discerned (figure 2) even when the bubble occupies the majority of the foil depth.The oxygen bubbles are stable, even in the thin foils, months after irradiation and if van der Waals behavior of the interior gas is assumed an oxygen pressure of about 4000 atmospheres must be sustained for a 100 bubble if the surface tension with the glass matrix is to balance against it at intermediate temperatures.

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

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