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Microwave vacuum pyrolysis of waste plastic and used cooking oil for simultaneous waste reduction and sustainable energy conversion: Recovery of cleaner liquid fuel and techno-economic analysis

Authors
Lam, Su ShiungWan Mahari, Wan AdibahOk, Yong SikPeng, WanxiChong, Cheng TungMa, Nyuk LingChase, Howard A.Liew, ZhenlingYusup, SuzanaKwon, Eilhann E.Tsang, Daniel C. W.
Issue Date
11월-2019
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Microwave vacuum pyrolysis; Waste; Plastic; Oil; Fuel; Techno-economic analysis
Citation
RENEWABLE & SUSTAINABLE ENERGY REVIEWS, v.115
Indexed
SCIE
SCOPUS
Journal Title
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
Volume
115
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/62123
DOI
10.1016/j.rser.2019.109359
ISSN
1364-0321
Abstract
Microwave vacuum pyrolysis was examined and compared to conventional pyrolysis for its technical and economic feasibility in co-processing of waste plastic and used cooking oil simultaneously to generate fuel product. The pyrolysis demonstrated beneficial process features with respect to high heating rate (29 degrees C/min) to provide fast heating, high process temperature for extensive cracking (581 degrees C), short process time (20 min), and low electrical energy consumption (0.38 kWh). The combined use of microwave vacuum pyrolysis and activated carbon reaction bed produced up to 84 wt% yield of liquid oil, containing light hydrocarbons and higher heating value (49 MJ/kg) than diesel and gasoline, hence showing great promise for application as fuel. The use of activated carbon reaction bed showed beneficial effect in creating a reduction environment that prevented the oxidation or formation of oxygenated by-products. A positive synergistic effect between waste plastic and used cooking oil was also observed. The liquid oil obtained from this pyrolysis approach presented a low oxygen and nitrogen content, and free of sulphur, showing 'cleaner' properties with respect to reduced char residues, sludge formation, corrosiveness, degradation of oil quality, and emission of undesired SOx and NOx during its utilization in combustion process. The techno-economic analysis indicated that this pyrolysis approach showed low production cost (USD 0.25/L compared to USD 0.523/L of diesel price in Malaysia). Our results demonstrate that microwave vacuum pyrolysis is potentially economically feasible and show promise as a sustainable approach for energy conversion in providing improved process features and production of cleaner liquid fuel.
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College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles

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