期刊
WASTE MANAGEMENT
卷 48, 期 -, 页码 285-299出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2015.10.012
关键词
Leather; Kinetics; Modelling; Pyrolysis; Thermal decomposition; Alkali treatment
资金
- IVACE
- Generalitat Valenciana (Spain)
- FEDER (EU)
The thermal decomposition of chrome tanned leather before and after a soaking treatment with NaOH was studied using thermogravimetric analysis (TGA). The effect of the solution concentration (0.2 M and 0.5 M) and the soaking time (5 min and 15 min) was evaluated. TGA experiments at four heating rates (5, 10, 15 and 20 degrees C min(-1)) were run in a nitrogen atmosphere for every treatment condition. A kinetic model was developed considering the effect of the three variables studied, i.e.: the NaOH solution concentration, the soaking time and the heating rate. The proposed model for chrome tanned leather pyrolysis involves a set of four reactions, i.e.: three independent nth order reactions, yielding the corresponding products and one of them undergoing a successive cero order reaction. The model was successfully applied simultaneously to all the experimental data obtained. The evaluation of the kinetic parameters obtained (activation energy, pre-exponential factor and reaction order) allowed a better understanding of the effect of the alkali treatment on these wastes. (C) 2015 Elsevier Ltd. All rights reserved.
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