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Electrochemical conversion of enriched crude glycerol: Effect of operating parameters

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  • Hunsom, Mali
  • Saila, Payia

Abstract

The enrichment of crude glycerol (29.8 wt.%) from a biodiesel production plant and its subsequent electrochemical conversion under a galvanostatic mode to added-value compounds was successfully performed at a laboratory scale. The optimal solvent-extraction based enrichment of the crude glycerol, after the acid pre-treatment to remove most free fatty acids and salts, was found using n-propanol:pre-treated crude glycerol at volume ratio of 2, attaining 97.9% glycerol. The effects of the initial glycerol solution pH (1, 7 or 11), type of electrode (platinum (Pt), titanium-coated ruthenium oxide (Ti/RuO2) or stainless steel (SS)) and applied current density (0.08–0.27 A/cm2) were explored. Using a galvanostatic mode, the enriched crude glycerol could be converted to added-value products, such as ethylene glycol, acetol, glycidol, acrolein, 1,2-propanediol (PD) and 1,3-PD. A Pt electrode, initial glycerol solution pH of 1 and current density of 0.14 A/cm2 were found to be optimal giving a complete conversion of 0.3 M glycerol within 14 h with a total product yield of 68.7%. However, each specific product had a different optimal applied current density and electrolysis time. Finally, a simplified diagram showing the possible major reaction pathways of glycerol conversion by this electrochemical conversion over a Pt electrode was presented.

Suggested Citation

  • Hunsom, Mali & Saila, Payia, 2015. "Electrochemical conversion of enriched crude glycerol: Effect of operating parameters," Renewable Energy, Elsevier, vol. 74(C), pages 227-236.
    • Handle: RePEc:eee:renene:v:74:y:2015:i:c:p:227-236
    DOI: 10.1016/j.renene.2014.08.008
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    References listed on IDEAS

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    1. Ayoub, Muhammad & Abdullah, Ahmad Zuhairi, 2012. "Critical review on the current scenario and significance of crude glycerol resulting from biodiesel industry towards more sustainable renewable energy industry," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 2671-2686.
    2. Beatrice, Carlo & Di Blasio, Gabriele & Lazzaro, Maurizio & Cannilla, Catia & Bonura, Giuseppe & Frusteri, Francesco & Asdrubali, Francesco & Baldinelli, Giorgio & Presciutti, Andrea & Fantozzi, Franc, 2013. "Technologies for energetic exploitation of biodiesel chain derived glycerol: Oxy-fuels production by catalytic conversion," Applied Energy, Elsevier, vol. 102(C), pages 63-71.
    3. Rahmat, Norhasyimi & Abdullah, Ahmad Zuhairi & Mohamed, Abdul Rahman, 2010. "Recent progress on innovative and potential technologies for glycerol transformation into fuel additives: A critical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(3), pages 987-1000, April.
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    Cited by:

    1. Talebian-Kiakalaieh, Amin & Amin, Nor Aishah Saidina, 2017. "Thermo-kinetic and diffusion studies of glycerol dehydration to acrolein using HSiW-γ-Al2O3 supported ZrO2 solid acid catalyst," Renewable Energy, Elsevier, vol. 114(PB), pages 794-804.
    2. Muhammad Harussani Moklis & Shou Cheng & Jeffrey S. Cross, 2023. "Current and Future Trends for Crude Glycerol Upgrading to High Value-Added Products," Sustainability, MDPI, vol. 15(4), pages 1-30, February.
    3. Khosravanipour Mostafazadeh, Ali & De La Torre, Maria Samantha & Padilla, Yessika & Drogui, Patrick & Brar, Satinder Kaur & Tyagi, Rajeshwar Dayal & Le Bihan, Yann & Buelna, Gerardo & Moroyoqui, Pablo, 2021. "An insight into an electro-catalytic reactor concept for high value-added production from crude glycerol: Optimization, electrode passivation, product distribution, and reaction pathway identification," Renewable Energy, Elsevier, vol. 172(C), pages 130-144.

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