Pyrolysis of textile wastes: I. Kinetics and yields

✍ Scribed by R. Miranda; C. Sosa_Blanco; D. Bustos-Martínez; C. Vasile

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 712 KB
• Volume: 80
• Category: Article
• ISSN: 0165-2370
• DOI: 10.1016/j.jaap.2007.03.008

✦ Synopsis

Thermal behavior of textile waste was studied by thermogravimetry at different heating rates and also by semi-batch pyrolysis. It was shown that the onset temperature of mass loss is within 104-156 8C and the final reaction temperature is within 423-500 8C. The average mass loss is 89.5%. There are three DTG peaks located at the temperature ranges of 135-309, 276-394 and 374-500 8C, respectively. The first two might be associated with either with decomposition of the hemicellulose and cellulose or with different processes of cellulose decomposition. The third peak is possibly associated to a synthetic polymer. At a temperature of 460 8C, the expected amount of volatiles of this waste is within 85-89%. The kinetic parameters of the individual degradation processes were determined by using a parallel model. Their dependence on the heating rate was also established. The pyrolysis rate is considered as the sum of the three reaction rates. The pyrolysis in a batch reactor at 700 8C and nitrogen flow of 60 ml/min produces 72 wt.% of oil, 13.5 wt.% of gas and 12.5 wt.% of char. The kinetic parameters of the first peak do not vary with heating rate, while those of the second and the third peak increase and decrease, respectively, with an increasing heating rate, proving the existence of complex reaction mechanisms for both cases.