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Kinetics Investigation of the Thermal Treatment of Textile Waste with Particular Emphasis on Cellulosic/Polyester Fabrics

Mostofian, Taraneh | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57888 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fotovat, Farzam; Yaghmai, Soheila; Ghobadi, Zahra
  7. Abstract:
  8. In this study, the co-pyrolysis process of textile waste based on cellulose and polyethylene terephthalate (PET) was investigated using thermogravimetric analysis (TGA/DTG). Additionally, the pyrolysis kinetics of the thermal degradation process for each material and their combinations were studied. Kinetic parameters, including activation energy (E) and pre-exponential factor (A), were calculated for the pyrolysis of the samples using iso-conversional kinetic models such as Friedman (FR), Kissinger-Akahira-Sunose (KAS), and Flynn-Wall-Ozawa (FWO) based on the TGA and DTG curve data and compared with the corresponding reported values. Furthermore, the pyrolysis kinetics were modeled using continuous and discrete distributed activation energy models (DAEM) based on experimental TGA data, and the thermal decomposition behavior was predicted using these models. The predicted curves obtained from the continuous DAEM algorithm showed good agreement with experimental data, with fitting values exceeding 97% for the conversion rate and over 98% for the degree of conversion. This demonstrates the accurate interpretation of the pyrolysis process by the DAEM model. In the discrete DAEM algorithm, initially, 88 first-order reactions were assumed for modeling the pyrolysis process; however, not all of these reactions had a significant contribution to the process. Based on the kinetic parameters obtained from the discrete DAEM algorithm, it was determined that the thermal decomposition process of cellulose: PET mixtures with ratios C:P70:30, C: P50:50, and C: P30:70 can be modeled with 16, 14, and 11 parallel first-order reactions, respectively. Additionally, the synergistic effect of different cellulose and PET ratios on reaction kinetics and pyrolysis products was studied. It was found that the C: P30:70 ratio exhibited the highest promotive synergistic effect in two temperature ranges (300–350°C) and (420–530°C). Conversely, the C: P70:30 ratio showed the least promotive synergy in the same temperature ranges
  9. Keywords:
  10. Textile Waste ; Cellulose ; Polyethylene Terephthalate ; Pyrolysis ; Isoconversional Kinetic ; Distributed Activation Energy Model (DAEM) ; Thermogravimetry Analysis

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