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Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production

Author

Listed:
  • Jincheng Ding

    (College of Chemical Engineering, Shandong University of Technology, Zibo, Shandong 255049, China)

  • Zheng Xia

    (Pharmaceutical & Biological Engineering Department, Zibo Vocational Institute, Zibo, Shandong 255314, China)

  • Jie Lu

    (Department of Resources and Environmental Engineering, Shandong University of Technology, Zibo, Shandong 255049, China)

Abstract

Oils with high content of free fatty acid (FFA) can be treated by acid esterification where an alcohol reacts with the given oil in the presence of acid catalyst. The investigated parameters include methanol to oil ratio, temperature and amount of catalyst. The optimum conditions for acid esterification which could reduce FFA content in the feedstock to less than 1.88% (acid value 3.76 mg KOH/g waste cooking oil) were 50 °C, 20% methanol to oil ratio (by volume) and 0.4 vol.% H 2 SO 4 after 5 h. However, oil with an acid value of more than 1 mg KOH/g oil cannot meet the alkaline catalyzed transesterification conditions. Under the conditions of NaOH concentration 0.5 N, excess alkali 15%, 60 °C, 40 min, the FFA removal rate for deacidification reached 77.11% (acid value 0.86 mg KOH/g esterified oil). The acid value of deacidification product was reduced below 0.86 mg KOH/g esterified oil, thus meeting the base-catalyzed trans-esterification conditions.

Suggested Citation

  • Jincheng Ding & Zheng Xia & Jie Lu, 2012. "Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production," Energies, MDPI, vol. 5(8), pages 1-9, July.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:8:p:2683-2691:d:19073
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    References listed on IDEAS

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    1. Jincheng Ding & Benqiao He & Jianxin Li, 2011. "Biodiesel Production from Acidified Oils via Supercritical Methanol," Energies, MDPI, vol. 4(12), pages 1-12, December.
    2. Tan, K.T. & Lee, K.T. & Mohamed, A.R., 2011. "Potential of waste palm cooking oil for catalyst-free biodiesel production," Energy, Elsevier, vol. 36(4), pages 2085-2088.
    3. Barnwal, B.K. & Sharma, M.P., 2005. "Prospects of biodiesel production from vegetable oils in India," Renewable and Sustainable Energy Reviews, Elsevier, vol. 9(4), pages 363-378, August.
    4. Park, Ji-Yeon & Wang, Zhong-Ming & Kim, Deog-Keun & Lee, Jin-Suk, 2010. "Effects of water on the esterification of free fatty acids by acid catalysts," Renewable Energy, Elsevier, vol. 35(3), pages 614-618.
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    Cited by:

    1. Ming-Chien Hsiao & Li-Wen Chang & Shuhn-Shyurng Hou, 2019. "Study of Solid Calcium Diglyceroxide for Biodiesel Production from Waste Cooking Oil Using a High Speed Homogenizer," Energies, MDPI, vol. 12(17), pages 1-11, August.
    2. Erika Carnevale & Giovanni Molari & Matteo Vittuari, 2017. "Used Cooking Oils in the Biogas Chain: A Technical and Economic Assessment," Energies, MDPI, vol. 10(2), pages 1-13, February.

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