title: Kinetic model of the thermal pyrolysis of chrome tanned leather treated with NaOH under different conditions using thermogravimetric analysis.
abstract: 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 (0.2M and 0.5M) and the soaking time (5min and 15min) was evaluated. TGA experiments at four heating rates (5, 10, 15 and 20°Cmin(-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.
authors.affiliation: Spanish Footwear Technology Institute (INESCOP), Poligono Industrial Campo Alto, P.O. Box 253, E-03600 Elda, Spain. Electronic address: elenab@inescop.es.
authors.forename: E
authors.initials: E
authors.lastname: Bañón
authors.affiliation: Department of Chemical Engineering, University of Alicante, P.O. Box 99, E-03080 Alicante, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Marcilla
authors.affiliation: Department of Chemical Engineering, University of Alicante, P.O. Box 99, E-03080 Alicante, Spain.
authors.forename: A N
authors.initials: AN
authors.lastname: García
authors.affiliation: Spanish Footwear Technology Institute (INESCOP), Poligono Industrial Campo Alto, P.O. Box 253, E-03600 Elda, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Martínez
authors.affiliation: Department of Chemical Engineering, University of Alicante, P.O. Box 99, E-03080 Alicante, Spain.
authors.forename: M
authors.initials: M
authors.lastname: León
mesh_terms: D002857:Chromium; D007700:Kinetics; D008962:Models, Theoretical; D012972:Sodium Hydroxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013783:Textile Industry / Q000379:methods*; D013818:Thermogravimetry / Q000379:methods*; D018505:Waste Management; D014866:Waste Products / Q000032:analysis
chemical_list: D014866:Waste Products; D002857:Chromium; D012972:Sodium Hydroxide
keywords: Alkali treatment; Kinetics; Leather; Modelling; Pyrolysis; Thermal decomposition