황토 합성 촉매를 사용한 면섬유와 폴리에스터섬유의 마이크로파 열분해에 관한 연구

김현준1*, 최준원1,2

(1서울대학교 국제농업기술대학원, 2서울대학교 그린바이오과학기술연구원)

Microwave-assisted fast pyrolysis of cotton and polyester textile wastes with Korean loess hybrid catalyst

Xuanjun Jin1*, Joon Weon Choi1,2

(1Graduate School of International Agricultural Technology, Seoul National University,

2Institutes of Green-Bio Science and Technology, Seoul National University)

Abstract: Korean loess hybrid catalysts were used to investigate the microwave-assisted fast pyrolysis of cotton textile (CT) and polyester textile (PET) wastes. Thermogravimetric analysis revealed synergistic effects during co-pyrolysis, with the PET decomposition temperature decreasing from 429 to 419 °C in the presence of CT. The study employed a purpose-built microwave pyrolysis system connected to a fixed-bed catalytic reactor, operating at 500 °C with a 200 g/h feedstock rate. Gas chromatography-mass spectrometry analysis of the resulting bio-oil showed that catalytic co-pyrolysis significantly reduced the quantity of oxygen-containing compounds while increasing the yield of valuable hydrocarbons. In non-catalytic pyrolysis, PET yielded 10.1% monocyclic aromatic hydrocarbons and 23.5% polycyclic aromatic hydrocarbons, while CT produced 19.0% furans and 25.8% acids and esters. The Korean loess hybrid catalysts demonstrated effective deoxygenation capabilities, promoting the formation of aromatic hydrocarbons through oligomerization, cyclization, and hydrogen transfer reactions. Notably, the co-pyrolysis process led to enhanced decarboxylation or decarbonylation, evidenced by the significant decrease in benzoic acid content. The physicochemical properties of the bio-oil showed improvements, with moisture content decreasing from 10.5% for CT alone to 4.9-5.8% in co-pyrolysis. The total acid number was similar in co-pyrolysis compared to CT alone. This research provides crucial insights into sustainable textile waste management, offering a promising approach for upcycling textile wastes into high-value chemicals and fuels, thus contributing to developing a circular economy in the textile industry.

Keywords: Fast pyrolysis, Microwave, Cotton, Polyester, Korean loess