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Journal of Thermal Analysis and Calorimetry

, Volume 131, Issue 3, pp 2157–2165 | Cite as

Thermal degradation kinetics study and thermal cracking of waste cooking oil for biofuel production

  • Fekadu Mosisa Wako
  • Ali Shemshedin Reshad
  • Vaibhav V. GoudEmail author
Article

Abstract

Thermal cracking of waste cooking oil (WCO) for production of liquid fuel has gained special interest due to the growing demand of renewable fuel, depleting fossil fuel reserves and environmental issues. In the present work, thermal cracking of WCO to produce liquid hydrocarbon fuels without any preprocessing has been studied. Moreover, non-isothermal kinetics of WCO using thermogravimetric analysis (TGA) has been studied under an inert atmosphere at various heating rates. According to TGA result, active thermal decomposition of WCO was found to be between 318 and 500 °C. Furthermore, the temperature at which the maximum mass loss rate attained was shifted to higher values as the heating rates increased from 10 to 50 °C min−1 and the values were found to be approximately similar to that of R 50. Besides, model-free iso-conversion kinetic methods such as Friedman (FM), Kissinger–Akahira–Sunose (KAS) and Flynn–Wall–Ozawa (FWO) were used to determine the activation energies of WCO degradation. The average activation energy for the thermal degradation of WCO was found to be 243.7, 211.23 and 222 kJ mol−1 for FM, KAS and FWO kinetic methods, respectively. Additionally, the cracking of WCO was studied in a semi-batch reactor under an inert atmosphere and the influences of cracking temperature, time and heating rates on product distribution were investigated. From the reaction, an optimum yield of 72 mass% was obtained at a temperature of 475 °C, time of 180 min and a heating rate of 10 °C min−1. The physicochemical properties studied were in accordance with ASTM standards.

Keywords

Waste cooking oil Thermal cracking Organic liquid product Thermogravimetric analysis Kinetic analysis Activation energy 

Notes

Acknowledgements

The authors gratefully acknowledge Indian Institute of Technology Guwahati, Department of Chemical Engineering and Centre for Instrument Facility (CIF) for the provision of analytical facilities to carry out the research work.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2017

Authors and Affiliations

  • Fekadu Mosisa Wako
    • 1
  • Ali Shemshedin Reshad
    • 1
  • Vaibhav V. Goud
    • 1
    Email author
  1. 1.Department of Chemical EngineeringIndian Institute of Technology GuwahatiGuwahatiIndia

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