(2019) Renewable and Sustainable Energy Reviews_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

Lam S.S., Wan Mahari W.A., Ok Y.S., Peng W., Chong C.T., Ma N.L., Chase H.A., Liew Z., Yusup S., Kwon E.E., Tsang D.C.W.

(Elsevier Ltd) Renewable and Sustainable Energy Reviews ISSN: 13640321 Vol.115 Issue. Article No.109359 DOI: 10.1016/j.rser.2019.109359

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 °C/min) to provide fast heating, high process temperature for extensive cracking (581 °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. © 2019 Elsevier Ltd

The authors acknowledge the Ministry of Education Malaysia for the financial support under Fundamental Research Grant Scheme (Vot 59434 , 59512 , 59482 ) and Universiti Malaysia Terengganu under Golden Goose Research Grant Scheme (Vot 55191 ). The authors also acknowledge Henan Agricultural University , Universiti Malaysia Terengganu , and Cambridge University for the technical, facility and analytical support throughout this research, especially to the research staffs, postdoc, and assistants in the labs. The authors acknowledge the Ministry of Education Malaysia for the financial support under Fundamental Research Grant Scheme (Vot 59434, 59512, 59482) and Universiti Malaysia Terengganu under Golden Goose Research Grant Scheme (Vot 55191). The authors also acknowledge Henan Agricultural University, Universiti Malaysia Terengganu, and Cambridge University for the technical, facility and analytical support throughout this research, especially to the research staffs, postdoc, and assistants in the labs.