Evaluation of thermal decomposition kinetics of borax pentahydrate using genetic algorithm method by isothermal analysis

The thermal calcination of borax pentahydrate was investigated for both dehydration and decomposition steps at temperatures between 392 and 573 K in a controlled fluidized bed drier. The best kinetic parameters (reaction rate constants, reaction order and equilibrium values) of both steps were deter...

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Bibliographic Details
Published in:Turkish journal of chemistry 2003, Vol.27 (2), p.197-207
Main Authors: BULUTCU, A. Nusret, ŞAHİN, Ömer
Format: Article
Language:English
Subjects:
activation energy
Akışkan yataklı kurutucu
Aktivasyon enerjisi
Boraks pentahidrat
Borax pentahydrate
Bozunma
Calcination
Chemical Operation and Equipment
decomposition
Dehidrasyon kinetiği
Dehydration kinetics
Fizikokimya
Fluidized bed dryer
genetic algorithm
Genetik algoritma
Isothermal analysis
İzotermal analiz
Kalsinasyon
Kimyasal İşlemler ve Donanımı
Kinetics
Kinetik
Physical Chemistry
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Summary:The thermal calcination of borax pentahydrate was investigated for both dehydration and decomposition steps at temperatures between 392 and 573 K in a controlled fluidized bed drier. The best kinetic parameters (reaction rate constants, reaction order and equilibrium values) of both steps were determined by the genetic algorithm (GA) method for each calcination temperature in respect of relative standard deviation. The values of the kinetic parameters showed that the dehydration step of borax pentahydrate was controlled by a homogeneous reaction of the order of about 2/3 whereas the decomposition step was controlled by a reaction order of about 1. These kinetic parameters determined by GA were also utilized to compare the experimental results with theoretical calculations. Activation energy was calculated tobe 92.88 kJ/mole and 15.94 kJ/mole for the dehydration and decomposition steps, respectively.
ISSN:1300-0527
1303-6130