Kinetic study of the effect of the heating rate on the waste tyre pyrolysis to maximise limonene production
| Autor: | B. Danon, N.M. Mkhize, P. van der Gryp, Johann F. Görgens |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Arrhenius equation
Thermogravimetric analysis Limonene Order of reaction Chemistry 020209 energy General Chemical Engineering Kinetics Analytical chemistry 02 engineering and technology General Chemistry Activation energy symbols.namesake chemistry.chemical_compound 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering symbols 0204 chemical engineering Pyrolysis Isoprene |
| Zdroj: | Chemical Engineering Research and Design. 152:363-371 |
| ISSN: | 0263-8762 |
| DOI: | 10.1016/j.cherd.2019.09.036 |
| Popis: | The formation of isoprene and dl -limonene during waste tyre pyrolysis was investigated in terms of the effect of the heating rate (up to 100 °C/min). Ion current signals were used to track during pyrolysis the evolution of the predominant ions of isoprene (isoprene 67) and dl -limonene (limonene 93), by using a thermogravimetric analyser coupled with mass spectrometry (TGA/MS). The combined model-free and model-based kinetics were used to estimate the activation energy (Ea) for isoprene and dl -limonene formation at 131 and 115 kJ/mole, respectively, based on the Kissinger method. Reaction order (n) values were estimated at 1.2 and 1.1 for isoprene and dl -limonene, respectively. Better model fit (R2 = 0.998) of the experimental data to the Arrhenius equation for isoprene and dl -limonene, respectively, was observed when the Kissinger method was used compare to Friedman method. Although the Ea values for isoprene and dl -limonene were not significantly different, the combined three kinetic parameters (Ea, pre-exponential constant (A), and n) may be significantly different. Therefore, for dl -limonene formation selectivity over isoprene, the differences in the three kinetic parameters values for each compound model and heating rate on the reaction progress was significant. The reaction progress at peak isoprene and dl -limonene formation rate increased from 0.42 to 0.45 and more significantly from 0.35 to 0.44, respectively as the heating rate was increased from 15 to 100 °C, confirming that the preferred strategy to maximise dl -limonene production is rapid heating to the moderate final pyrolysis temperature. |
| Databáze: | OpenAIRE |
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