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Fuel ethanol production from starchy grain and other crops: An overview on feedstocks, affecting factors, and technical advances

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  • Li, Jun
  • Zhao, Renyong
  • Xu, Youjie
  • Wu, Xiaorong
  • Bean, Scott R.
  • Wang, Donghai

Abstract

The substitution of gasoline by ethanol with different ratios is commercialized around the world. In this review, an overview on feedstocks, affecting factors, and technical advances in starch ethanol production has been systematically presented. Most ethanol is produced from starchy crops, among which corn, wheat, and sorghum are the major contributors. Additional starchy crops have also been studied for ethanol production but have not yet been industrialized. Degerming and decortication can improve ethanol yield with value-added products produced for ethanol valorization. Starchy crops varieties with high waxy starch, low starch-lipid complex formed, and low protein cross-linking after cooking are more productive for ethanol production. Starch and fiber can not only be separated for first- and second-generation ethanol production, respectively, but also combined for 1.5-generation ethanol production, which is techno-economically feasible. Process integration could be great routes to improve competitive advantage of ethanol due to reduced production cost, but relevant techniques need further advances. Prehydrolysis of protein during mashing can increase FAN content thus improve ethanol yield, but its economics need to be assessed. Value-added protein extracted from DDGS for extensive applications can also valorize ethanol. Recommendations for further improving starch ethanol production and valorizing ethanol have also been included.

Suggested Citation

  • Li, Jun & Zhao, Renyong & Xu, Youjie & Wu, Xiaorong & Bean, Scott R. & Wang, Donghai, 2022. "Fuel ethanol production from starchy grain and other crops: An overview on feedstocks, affecting factors, and technical advances," Renewable Energy, Elsevier, vol. 188(C), pages 223-239.
    • Handle: RePEc:eee:renene:v:188:y:2022:i:c:p:223-239
    DOI: 10.1016/j.renene.2022.02.038
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    4. Nikolaou, M. & Stavraki, C. & Bousoulas, Ι. & Malamis, D. & Loizidou, M. & Mai, S. & Barampouti, E.M., 2023. "Valorisation of bakery waste via the bioethanol pathway," Energy, Elsevier, vol. 280(C).

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