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Continuous Integrated Process of Biodiesel Production and Purification—The End of the Conventional Two-Stage Batch Process?

Author

Listed:
  • Matea Bačić

    (Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia)

  • Anabela Ljubić

    (Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia)

  • Martin Gojun

    (Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia)

  • Anita Šalić

    (Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia)

  • Ana Jurinjak Tušek

    (Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia)

  • Bruno Zelić

    (Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia)

Abstract

In this research, optimization of the integrated biodiesel production process composed of transesterification of edible sunflower oil, catalyzed by commercial lipase, with simultaneous extraction of glycerol from the reaction mixture was performed. Deep eutectic solvents (DESs) were used in this integrated process as the reaction and extraction media. For two systems, choline chloride:glycerol (ChCl:Gly) and choline chloride:ethylene glycol (ChCl:EG), respectively, the optimal water content, mass ratio of the phase containing the mixture of reactants (oil and methanol) with an enzyme and a DES phase (mass ratio of phases), and the molar ratio of deep eutectic solvent constituents were determined using response surface methodology (RSM). Experiments performed with ChCl:Gly resulted in a higher biodiesel yield and higher glycerol extraction efficiency, namely, a mass ratio of phases of 1:1, a mass fraction of water of 6.6%, and a molar ratio of the ChCl:Gly of 1:3.5 were determined to be the optimal process conditions. When the reaction was performed in a batch reactor under the optimal conditions, the process resulted in a 43.54 ± 0.2% yield and 99.54 ± 0.19% glycerol extraction efficiency ( t = 2 h). Unfortunately, the free glycerol content was higher than the one defined by international standards ( w G > 0.02%); therefore, the process was performed in a microsystem to enhance the mass transfer. Gaining the same yield and free glycerol content below the standards ( w G = 0.0019 ± 0.003%), the microsystem proved to be a good direction for future process optimization.

Suggested Citation

  • Matea Bačić & Anabela Ljubić & Martin Gojun & Anita Šalić & Ana Jurinjak Tušek & Bruno Zelić, 2021. "Continuous Integrated Process of Biodiesel Production and Purification—The End of the Conventional Two-Stage Batch Process?," Energies, MDPI, vol. 14(2), pages 1-17, January.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:2:p:403-:d:479260
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    References listed on IDEAS

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    1. Chattopadhyay, Soham & Sen, Ramkrishna, 2013. "Fuel properties, engine performance and environmental benefits of biodiesel produced by a green process," Applied Energy, Elsevier, vol. 105(C), pages 319-326.
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    4. Aboelazayem, Omar & Gadalla, Mamdouh & Saha, Basudeb, 2018. "Biodiesel production from waste cooking oil via supercritical methanol: Optimisation and reactor simulation," Renewable Energy, Elsevier, vol. 124(C), pages 144-154.
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    Cited by:

    1. Violeta Makareviciene, 2022. "Advances in Catalytic Technologies for Biodiesel Fuel Synthesis," Energies, MDPI, vol. 15(3), pages 1-4, January.
    2. Gojun, Martin & Šalić, Anita & Zelić, Bruno, 2021. "Integrated microsystems for lipase-catalyzed biodiesel production and glycerol removal by extraction or ultrafiltration," Renewable Energy, Elsevier, vol. 180(C), pages 213-221.

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