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Plastic vs. fuel: Which use of the Brazilian ethanol can bring more environmental gains?

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  • Alvarenga, Rodrigo A.F.
  • Dewulf, Jo

Abstract

Ethanol from sugarcane is mainly used as fuel for cars in Brazil. However, the chemical industry is considering ethanol also as biotic feedstock for several plastics (e.g. polyethylene and polyvinyl chloride). Both uses are able to cause less environmental impacts than their fossil references if we look to certain specific environmental impact categories such as fossil energy consumption and greenhouse gas (GHG) emissions. However, which use would be able to bring the most environmental gains to society? In order to answer this question, we performed an attributional life cycle assessment of using 1 kg of hydrous ethanol as fuel for transportation and the same amount for monomer production (ethylene), and compared them with the common practice of today in Brazil. Using ethanol to produce ethylene (instead of fossil-based ethylene) would generate environmental gains in the order of 32.0 MJ of fossil energy and 1.87 kg CO2eq, whereas the use of ethanol for transportation (instead of gasoline mixture, for flex-fuel cars) would generate environmental gains in the order of 27.2 MJ of fossil energy and 1.82 kg CO2eq. Some uncertainties were quantified, for instance we could observe that when the ethanol-to-ethylene reaction yield was lower than 96%, the fuel route had better results for GHG emission savings.

Suggested Citation

  • Alvarenga, Rodrigo A.F. & Dewulf, Jo, 2013. "Plastic vs. fuel: Which use of the Brazilian ethanol can bring more environmental gains?," Renewable Energy, Elsevier, vol. 59(C), pages 49-52.
    • Handle: RePEc:eee:renene:v:59:y:2013:i:c:p:49-52
    DOI: 10.1016/j.renene.2013.03.029
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    References listed on IDEAS

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    1. Goldemberg, José & Coelho, Suani Teixeira & Guardabassi, Patricia, 2008. "The sustainability of ethanol production from sugarcane," Energy Policy, Elsevier, vol. 36(6), pages 2086-2097, June.
    2. Christin Liptow & Anne‐Marie Tillman, 2012. "A Comparative Life Cycle Assessment Study of Polyethylene Based on Sugarcane and Crude Oil," Journal of Industrial Ecology, Yale University, vol. 16(3), pages 420-435, June.
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    2. Haro, Pedro & Aracil, Cristina & Vidal-Barrero, Fernando & Ollero, Pedro, 2015. "Balance and saving of GHG emissions in thermochemical biorefineries," Applied Energy, Elsevier, vol. 147(C), pages 444-455.

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