Kinetic Model Comparison for Waste Tire Char Reaction with CO2
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- 作者：Ramó ; n Murillo ; Marí ; a V. Navarro ; José ; M. Ló ; pez ; Elvira Ayló ; n ; Marí ; a S. Callé ; n ; Tomá ; s Garcí ; a ; and Ana M. Mastral
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2004
- 出版时间：November 24, 2004
- 年：2004
- 卷：43
- 期：24
- 页码：7768 - 7773
- 全文大小：157K
- 年卷期：v.43,no.24(November 24, 2004)
- ISSN：1520-5045
文摘
Pyrolysis has proven to be a useful recycling process for waste tires, and pyrolytic char is ~40%of initial sample weight. To valorize this solid, the activated carbon production has been studiedfor the last years from a generation point of view. However, there are only few studies aboutthe kinetics of the reaction. In this paper, four gas-solid models have been applied to CO2activation of tire char: volume model, modified volume model, changing grain size model, andrandom pore model. The reactions were performed in a thermobalance with a structural andanalytically characterized tire char obtained by pyrolysis in a fixed-bed reactor at a temperatureof 1000 
C for 3 h. Experimental conditions were optimized to minimize internal and externalmass-transfer phenomena performing experiments with different particle sizes, at different flowrates and initial weights. Finally, to obtain the intrinsic kinetic parameters, several experimentswere carried out at different partial pressures of CO2 and temperatures, concluding that therandom pore model is the most appropriate model to describe the reaction. The tire char activationwas found to be a first-order reaction with respect to CO2. The kinetic results reported in thispaper can be useful for tire char activation scaling-up and the process engineering design, sothat knowledge of the activation energy and the preexponential factor of the chemical reactionis fundamental to perform the chemical reactor design and the optimization of processparameters.
C for 3 h. Experimental conditions were optimized to minimize internal and externalmass-transfer phenomena performing experiments with different particle sizes, at different flowrates and initial weights. Finally, to obtain the intrinsic kinetic parameters, several experimentswere carried out at different partial pressures of CO2 and temperatures, concluding that therandom pore model is the most appropriate model to describe the reaction. The tire char activationwas found to be a first-order reaction with respect to CO2. The kinetic results reported in thispaper can be useful for tire char activation scaling-up and the process engineering design, sothat knowledge of the activation energy and the preexponential factor of the chemical reactionis fundamental to perform the chemical reactor design and the optimization of processparameters.