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

Su Shiung Lam, Wan Adibah Wan Mahari, Yong Sik Ok, Wanxi Peng, Cheng Tung Chong, Nyuk Ling Ma, Howard A. Chase, Zhenling Liew, Suzana Yusup, Eilhann E. Kwon, Daniel C.W. Tsang

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 °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.

Original languageEnglish
Article number109359
JournalRenewable and Sustainable Energy Reviews
Volume115
DOIs
Publication statusPublished - 2019 Nov 1

Fingerprint

Cooking
Economic analysis
Liquid fuels
Energy conversion
Pyrolysis
Microwaves
Vacuum
Plastics
Recovery
Activated carbon
Heating
Liquids
Oils
Heating rate
Gasoline
Byproducts
Energy utilization
Sulfur
Hydrocarbons
Nitrogen

Keywords

  • Fuel
  • Microwave vacuum pyrolysis
  • Oil
  • Plastic
  • Techno-economic analysis
  • Waste

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

Cite this

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, Su Shiung; Wan Mahari, Wan Adibah; Ok, Yong Sik; Peng, Wanxi; Chong, Cheng Tung; Ma, Nyuk Ling; Chase, Howard A.; Liew, Zhenling; Yusup, Suzana; Kwon, Eilhann E.; Tsang, Daniel C.W.

In: Renewable and Sustainable Energy Reviews, Vol. 115, 109359, 01.11.2019.

Research output: Contribution to journalArticle

Lam, Su Shiung ; Wan Mahari, Wan Adibah ; Ok, Yong Sik ; Peng, Wanxi ; Chong, Cheng Tung ; Ma, Nyuk Ling ; Chase, Howard A. ; Liew, Zhenling ; Yusup, Suzana ; Kwon, Eilhann E. ; Tsang, Daniel C.W. / 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. In: Renewable and Sustainable Energy Reviews. 2019 ; Vol. 115.
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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 °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.",
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AU - Lam, Su Shiung

AU - Wan Mahari, Wan Adibah

AU - Ok, Yong Sik

AU - Peng, Wanxi

AU - Chong, Cheng Tung

AU - Ma, Nyuk Ling

AU - Chase, Howard A.

AU - Liew, Zhenling

AU - Yusup, Suzana

AU - Kwon, Eilhann E.

AU - Tsang, Daniel C.W.

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N2 - 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.

AB - 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.

KW - Fuel

KW - Microwave vacuum pyrolysis

KW - Oil

KW - Plastic

KW - Techno-economic analysis

KW - Waste

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