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Integrated production of biodiesel and bioethanol from sweet potato

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  • Virgínio e Silva, Joab Oliveira
  • Almeida, Manuel Fonseca
  • da Conceição Alvim-Ferraz, Maria
  • Dias, Joana Maia

Abstract

In the present study, the production of sweet potato bioethanol was conducted at a small industrial plant in Brazil and integrated in biodiesel production through ethanolysis. The specific objectives were: (i) monitor bioethanol production at a small industrial plant, considering production yield; (ii) study the ethanolysis of sunflower oil using sweet potato bioethanol with different grades (98, 99 and 99.4 °GL), with focus on biodiesel yield and purity. Bioethanol was produced under the following conditions: Sweet potato dilution in water (1:1 in wt.%); enzymatic hydrolysis with alpha-amylase (90 °C) and glucoamylase (60 °C) enzymes (700 mL/t); and, fermentation (30 °C) with saccharomyces cerevisiae (3.3 kg/t). Ethanolysis was performed as follows: 6:1 ethanol:oil molar ratio; 1.0 wt% NaOH; 45 °C; 1 h. The average yield of bioethanol was 161.4 L/t, corresponding to 10 598 L/ha. Biodiesel synthesis using bioethanol of different grades showed that both the yield and purity of the product increased with the grade of the ethanol used, with values ranging from 63 to 83 wt%, and 50 to 94 wt% for yield and purity, respectively. Results show that a high alcohol grade is required to make viable integrated production of biodiesel and bioethanol.

Suggested Citation

  • Virgínio e Silva, Joab Oliveira & Almeida, Manuel Fonseca & da Conceição Alvim-Ferraz, Maria & Dias, Joana Maia, 2018. "Integrated production of biodiesel and bioethanol from sweet potato," Renewable Energy, Elsevier, vol. 124(C), pages 114-120.
    • Handle: RePEc:eee:renene:v:124:y:2018:i:c:p:114-120
    DOI: 10.1016/j.renene.2017.07.052
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    References listed on IDEAS

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    1. Ogunkunle, Oyetola & Ahmed, Noor A., 2019. "Performance evaluation of a diesel engine using blends of optimized yields of sand apple (Parinari polyandra) oil biodiesel," Renewable Energy, Elsevier, vol. 134(C), pages 1320-1331.
    2. Singh, Yashvir & Sharma, Abhishek & Tiwari, Sumit & Singla, Amneesh, 2019. "Optimization of diesel engine performance and emission parameters employing cassia tora methyl esters-response surface methodology approach," Energy, Elsevier, vol. 168(C), pages 909-918.
    3. Paola Sakai & Stavros Afionis & Nicola Favretto & Lindsay C. Stringer & Caroline Ward & Marco Sakai & Pedro Henrique Weirich Neto & Carlos Hugo Rocha & Jaime Alberti Gomes & Nátali Maidl de Souza & No, 2020. "Understanding the Implications of Alternative Bioenergy Crops to Support Smallholder Farmers in Brazil," Sustainability, MDPI, vol. 12(5), pages 1-22, March.
    4. Gabriel S. Aruwajoye & Alaika Kassim & Akshay K. Saha & Evariste B. Gueguim Kana, 2020. "Prospects for the Improvement of Bioethanol and Biohydrogen Production from Mixed Starch-Based Agricultural Wastes," Energies, MDPI, vol. 13(24), pages 1-22, December.
    5. Tedesco, Danilo & Moreira, Bruno Rafael de Almeida & Barbosa Júnior, Marcelo Rodrigues & Maeda, Murilo & Silva, Rouverson Pereira da, 2023. "Sustainable management of sweet potatoes: A review on practices, strategies, and opportunities in nutrition-sensitive agriculture, energy security, and quality of life," Agricultural Systems, Elsevier, vol. 210(C).

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