scholarly journals Kinetic study of the regeneration of spent caustic via the genetic algorithm method

2018 ◽  
Vol 5 (4) ◽  
pp. 231-229 ◽  
Author(s):  
Asadollah Karimi ◽  
Esmaeil Fatehifar ◽  
Reza Alizadeh ◽  
Hadi Soltani
Keyword(s):  
Genetic Algorithm ◽  
Catalytic Oxidation ◽  
Bubble Column ◽  
Oxygen Demand ◽  
Bubble Column Reactor ◽  
Elementary Model ◽  
Genetic Algorithm Method ◽  
Spent Caustic ◽  
High Chemical Oxygen Demand ◽  
Kinetics Of

Background: Spent caustic contains noxious components such as sulfide species and also high chemical oxygen demand content (COD). Oxidation of these materials to caustic and sulfate species is mostly the rate-controlling step within catalytic oxidation of spent caustic. Methods: In this study, the kinetics of catalytic oxidation of spent caustic and the regeneration methodology of the sulfidic spent caustic were investigated. The kinetics of catalytic oxidation of spent caustic was studied in the presence of a heterogeneous catalyst. The developed mathematical model was verified via the batch bubble column reactor. The elementary and non-elementary models based on the genetic algorithm were used to obtain the rate coefficient and kinetic order. Results: The experiments were carried out at various conditions. The results indicated that the error of objective function of the non-elementary and elementary models was 3.01% and 134.96%, respectively. Conclusion: According to the results, the non-elementary model had rational outcome compared to the elementary one. Also, non-elemental model is more concordance with experimental results.

Regeneration of spent caustic of olefin unit in a bubble column reactor: Treatment and recovery optimization

2016 ◽  
Vol 36 (2) ◽  
pp. 341-347 ◽  
Author(s):  
Asadollah Karimi ◽  
Esmaeil Fatehifar ◽  
Reza Alizadeh ◽  
Iraj Ahadzadeh
Keyword(s):  
Bubble Column ◽  
Bubble Column Reactor ◽  
Column Reactor ◽  
Spent Caustic

Ozonation kinetics of winery wastewater in a pilot-scale bubble column reactor

2009 ◽  
Vol 43 (6) ◽  
pp. 1523-1532 ◽  
Author(s):  
Marco S. Lucas ◽  
José A. Peres ◽  
Bing Yan Lan ◽  
Gianluca Li Puma
Keyword(s):  
Bubble Column ◽  
Pilot Scale ◽  
Bubble Column Reactor ◽  
Column Reactor ◽  
Winery Wastewater ◽  
Kinetics Of

Ozonation kinetics of cork-processing water in a bubble column reactor

2008 ◽  
Vol 42 (10-11) ◽  
pp. 2473-2482 ◽  
Author(s):  
Bing Yan Lan ◽  
Rinat Nigmatullin ◽  
Gianluca Li Puma
Keyword(s):  
Bubble Column ◽  
Bubble Column Reactor ◽  
Column Reactor ◽  
Processing Water ◽  
Kinetics Of

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).

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:

scholarly journals Application of the genetic algorithm method in the problem of chemical kinetics of the oxidative regeneration process

2021 ◽  
Vol 2131 (2) ◽  
pp. 022007
Author(s):  
O V Dubinets ◽  
I M Gubaidullin ◽  
R M Uzyanbaev ◽  
M K Vovdenko ◽  
I G Lapshin
Keyword(s):  
Experimental Data ◽  
Genetic Algorithm ◽  
Chemical Kinetics ◽  
Laboratory Installation ◽  
Complex Chemical ◽  
Oxidative Regeneration ◽  
Genetic Algorithm Method ◽  
Complex Chemical Reactions ◽  
Kinetics Of

Abstract Annotation. One of the main problems in chemical kinetics is the establishment of the mechanisms of complex chemical reactions. The inverse problem of chemical kinetics is understood as the determination of the dependence of the concentration of the participating components on the basis of experimental data obtained from a laboratory installation for the oxidative regeneration of coked catalysts. One of the main methods used in inverse problems the genetic algorithm. The algorithms considered in the article make it possible to determine the values of the rate constants of the considered chemical stages.

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