Polyester fiber is a high-molecular-weight compound made from fossil fuels and is used in various synthetic fiber manufacturing processes. In this study, we performed non-catalytic and catalytic pyrolysis experiments using cobalt oxide as a catalyst to recover energy from polyester fiber. The experiment was carried out between 500- 900 ℃ in the presence of N2. Amount of oil formation was the highest at 600 ℃ in non-catalytic pyrolysis and oil formation of catalytic pyrolysis was the highest at 500 ℃. In both non-catalytic pyrolysis and catalytic pyrolysis, gas content was increased and char was decreased with increasing temperature. A marked difference was observed when the catalyst was used; the formation of char was suppressed and oil and gas yields increased. In the catalytic pyrolysis oil, benzoic acid compounds accounted for the largest proportion (16.15 wt%) at 900 ℃, but polycyclic aromatic hydrocarbons and phenols were not observed. Benzoic acid is an important precursor material used to synthesize other organic substances, such as phenol and caprolactam. The non-condensable gas content increased from 11.55 wt% to 22.39 wt%, with increasing temperature. In particular, H2 gas yield was 4.44 wt% at 900 ℃. Therefore, by using catalytic pyrolysis, high value-added chemicals such as benzoic acid compounds and H2 gas can be recovered at high yield at 900 ℃ from the polyester fiber. Consequently, unlike the existing treatment methods, the environmental impact of plastics can be reduced by catalytic pyrolysis.

Waste Treatment Pyrolysis Plastic Waste Thermochemical Process Reusable Energy Catalytic Process

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