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

Ömer Şahin*, A. Nusret Bulutcu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)197-207
Number of pages11
JournalTurkish Journal of Chemistry
Volume27
Issue number2
Publication statusPublished - 2003
Externally publishedYes

Keywords

  • Activation energy
  • Borax pentahydrate
  • Decomposition kinetics
  • Dehydration kinetics
  • Fluidized bed drier
  • Genetic algorithm

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