Ozonation of Reactive Blue 81 in the bubble column

2001 ◽  
Vol 44 (5) ◽  
pp. 47-52 ◽  
Author(s):  
S. Ledakowicz ◽  
R. Maciejewska ◽  
J. Perkowski ◽  
A. Bin
Keyword(s):  
Chemical Reaction ◽  
Bubble Column ◽  
Bubble Column Reactor ◽  
Ozone Absorption ◽  
First Order ◽  
Average Value ◽  
Intrinsic Kinetics ◽  
Order Chemical Reaction ◽  
Inner Diameter ◽  
Kinetics Of

The decolourisation process of the Reactive Blue 81 was carried out in a laboratory bubble column reactor with inner diameter 110 mm and working height 550 mm, equipped with a porous glass ozone diffuser (diameter 50 mm). A model of ozone absorption with the chemical reaction in the liquid phase was employed. It was found that the decolourisation proceeds in the fast pseudo first-order regime. The average value of the enhancement factor was calculated from the experimental results and compared with those calculated according to the theory of mass transfer with a second-order chemical reaction. In order to determine the intrinsic kinetics of ozonation, a stopped-flow technique was employed. The rate constant of the dyestuff reaction with ozone was determined as equal to 4.5 × 107 mol/(dm3.s).

The Locomotor Activity of Fish: An Analogy to the Kinetics of an Opposed First-Order Chemical Reaction

1975 ◽  
Vol 104 (4) ◽  
pp. 752-754 ◽  
Author(s):  
Erik G. Ellgaard ◽  
Kerry S. Bloom ◽  
Anthony A. Malizia ◽  
Gerald E. Gunning ◽  
Richard E. Jensen
Keyword(s):  
Locomotor Activity ◽  
Chemical Reaction ◽  
First Order ◽  
Order Chemical Reaction ◽  
First Order Chemical Reaction ◽  
Kinetics Of

scholarly journals Chemical kinetics of hydrogen sulfide selective oxidation in aqueous iron chelates solutions

2013 ◽  
Vol 10 (3) ◽  
pp. 386-394
Keyword(s):  
Chemical Kinetics ◽  
Chemical Reaction ◽  
Bubble Column ◽  
Reaction Rate Constant ◽  
Gas Absorption ◽  
Bubble Column Reactor ◽  
Experimental Conditions ◽  
Absorption Phenomenon ◽  
Ph Range ◽  
Kinetics Of

The present work concerns the investigation of the chemical kinetics of H2S selective oxidation into elemental sulfur, by gas absorption and chemical reaction in Fe3+·(ΝΤΑ) aqueous solutions. By using initial reactivity data, priority is given to the study of intrinsic kinetics i.e. to avoid interactions with ligand degradation and the presence of sulfur. A wetted wall gas-liquid reactor was employed under a batch-recycle regime. The conversion of Fe3+ to Fe2+ chelate was determined over the pH range ca. 3–6, temperature range ca. 30–60°C and a short overall per run contact time of phases. The penetration theory was used for the evaluation of intrinsic reaction rate constant and enhancement factor. Activation energy values determined from the pertinent Arrhenius plots fall in the range, Εa=17.2– 22.8 kcal mol-1. These values compare satisfactorily with the value Εa=24 kcal mol-1 obtained from a similar kinetic study performed in a bubble column reactor and indicates a chemical reaction control of the overall gas absorption phenomenon. Enhancement factors varied in the respective ranges Ε =2.7–7.5 (pH=3), E=3.2–14.1 (pH=4), E=5.9–17.0 (pH=5), και Ε=6.7– 20.1 (pH=6) indicating a substantial increase of the mass transfer coefficient due to chemical reaction. For the experimental conditions applied in this study the following kinetic correlation was validated:

Interfacial mass transfer in turbulent flow accompanied by irreversible first order chemical reaction

1979 ◽  
Vol 44 (5) ◽  
pp. 1388-1396
Author(s):  
Václav Kolář ◽  
Zdeněk Brož
Keyword(s):  
Mass Transfer ◽  
Turbulent Flow ◽  
Chemical Reaction ◽  
Experimental Results ◽  
Theoretical Concepts ◽  
First Order ◽  
Order Chemical Reaction ◽  
Interfacial Mass Transfer ◽  
First Order Chemical Reaction

Relations describing the mass transfer accompanied by an irreversible first order chemical reaction are derived, based on the formerly published general theoretical concepts of interfacial mass transfer. These relations are compared with experimental results taken from literature.

Study on Kinetics of Reaction between ZrNi5 and Water Vapor

2012 ◽  
Vol 581-582 ◽  
pp. 694-697
Author(s):  
Yong Yao ◽  
De Li Luo ◽  
Zhi Yong Huang ◽  
Jiang Feng Song
Keyword(s):  
Water Vapor ◽  
Reaction Rate ◽  
Arrhenius Equation ◽  
Tritiated Water ◽  
First Order ◽  
Order Chemical Reaction ◽  
First Order Chemical Reaction ◽  
Kinetics Of Reaction ◽  
Reaction Activation Energy ◽  
Kinetics Of

In order to evaluate the feasibility of tritium recovery from tritiated water by thermochemical decomposition using ZrNi5, the kinetics of reaction between ZrNi5 and water vapor was studied by thermogravimetric method in the temperature range from 673K to 823K. The result shows that reaction rate increased significantly with the increasing of temperature and H2O concentration; the reaction mechanism for ZrNi5 can be described by the first-order chemical reaction, and the reaction is first order for H2O concentration. The reaction activation energy of ZrNi5 is 55.8kJ/mol calculated from the Arrhenius equation.

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