Biodiesel purification by solvent-aided crystallization using n-hexane as solvent
WAN NUR AISYAH Wan Osman, HATEEM Feroze, SHAFIRAH Samsuri, EDUARD Hernandez Yanezdownload PDF
Abstract. Biodiesel is a form of fuel that has a natural origin as it is derived from organic components such as vegetable oil and animal fats. However, biodiesel has to be purified based on the required biodiesel purity standards before it can be used as diesel fuel. This study focuses on a lab-based purification method which is solvent-aided crystallization (SAC) using a typical solvent used for oilseed extraction that is n-hexane. Response surface methodology was used to optimize the process parameters. The purified biodiesel was analyzed via GC-MS to determine its fatty acid methyl ester (FAME) content, reflecting the purity of the biodiesel. The effect of cooling temperature and the concentration of the solvent was studied. The highest purity was obtained at intermediate parameter levels; 12°C and 1.5 wt% of n-hexane. The predicted optimum process parameters within the experimental range were 9.924°C and 1.131 wt%, with FAME purity of 99.789%. The data was validated with an experimental run, and the FAME purity obtained was 99.88%, a 0.1% difference from the predicted value. The FAME purity obtained was above the biodiesel purity standards making this environmentally friendly process viable to be used on a much larger scale in the biodiesel industry.
Cooling Temperature, Fatty Acid Methyl Ester, Environmentally Friendly, Response Surface Methodology, Solvent Concentration
Published online 5/20/2023, 11 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: WAN NUR AISYAH Wan Osman, HATEEM Feroze, SHAFIRAH Samsuri, EDUARD Hernandez Yanez, Biodiesel purification by solvent-aided crystallization using n-hexane as solvent, Materials Research Proceedings, Vol. 29, pp 117-127, 2023
The article was published as article 15 of the book Sustainable Processes and Clean Energy Transition
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 Pacific Biodiesel, “What is Biodiesel,” 3 March 2020. [Online]. Available: https://www.biodiesel.com/what-is-biodiesel/. [Accessed 5 June 2021].
 Knoema, “Malaysia – Biodiesel consumption,” knoema.com, 2019. [Online]. Available: https://knoema.com/atlas/Malaysia/topics/Energy/Renewables/Biodiesel-consumption. [Accessed 5 June 2021].
 I. M. Atadashi, M. K. Aroua, A. R. Abdul Aziz and N. M. N. Sulaiman, “Refining technologies for the purification of crude biodiesel,” Applied Energy, vol. 88, no. 12, pp. 4239-4249, 2011. https://doi.org/10.1016/j.apenergy.2011.05.029
 H. Bateni, A. Saraeian and C. Able, “A comprehensive review on biodiesel purification and upgrading,” Biofuel Research Journal, vol. 4, no. 3, pp. 668-690, 2017. https://doi.org/10.18331/BRJ2017.4.3.5
 I. M. Atadashi, M. K. Aroua, A. R. Abdul Aziz and N. M. N. Sulaiman, “Membrane biodiesel production and refining technology: A critical review,” Renewable and Sustainable Energy Reviews, vol. 15, no. 9, pp. 5051-5062, 2011. https://doi.org/10.1016/j.rser.2011.07.051
 I. M. Atadashi, “Purification of crude biodiesel using dry washing and membrane technologies,” Alexandria Engineering Journal, pp. 1265-1272, 2015. https://doi.org/10.1016/j.aej.2015.08.005
 Z. Gao, S. Rohani, J. Gong and J. Wang, “Recent developments in the crystallization process: toward the pharmaceutical industry,” Engineering, vol. 3, no. 3, pp. 343-353, 2017. https://doi.org/10.1016/J.ENG.2017.03.022
 S. Samsuri, N. L. Jian, F. W. Jusoh, E. Hernández Yáñez and N. Y. Yahya, “Solvent‐Aided Crystallization for Biodiesel Purification,” Chemical Engineering & Technology, vol. 43, no. 3, pp. 447-456, 2020. https://doi.org/10.1002/ceat.201900433
 C. P. Davis, “Medical Definition of n-Hexane,” MedicineNet, 29 March 2021. [Online]. Available: https://www.medicinenet.com/n-hexane/definition.htm. [Accessed 10 July 2021].
 S. J. Kumar, S. R. Prasad, R. Banerjee, D. K. Agarwal, K. S. Kulkarni and K. V. Ramesh, “Green solvents and technologies for oil extraction from oilseeds,” Chemistry Central Journal, vol. 11, no. 1, pp. 1-7, 2017. https://doi.org/10.1186/s13065-017-0238-8
 M. M. K. Bhuiya, M. Rasul, M. Khan, N. Ashwath and M. Mofijur, “Comparison of oil extraction between screw press and solvent (n-hexane) extraction technique from beauty leaf (Calophyllum inophyllum L.) feedstock,” Industrial Crops and Products, vol. 144, p. 112024, 2020. https://doi.org/10.1016/j.indcrop.2019.112024
 M. Hayyan, F. S. Mjalli, M. A. Hashim and I. M. AlNashef, “A novel technique for separating glycerine from palm oil-based biodiesel using ionic liquids,” Fuel Processing Technology, vol. 91, no. 1, pp. 116-120, 2010. https://doi.org/10.1016/j.fuproc.2009.09.002
 F. Yang, M. A. Hanna and R. Sun, “Value-added uses for crude glycerol–a byproduct of biodiesel production,” Biotechnology for biofuels, p. 13, 2012. https://doi.org/10.1186/1754-6834-5-13
 N. Binhayeeding, S. Klomklao and K. Sangkharak, “Utilization of waste glycerol from biodiesel process as a substrate for mono-, di-, and triacylglycerol production,” Energy Procedia, vol. 138, pp. 895-900, 2017. https://doi.org/10.1016/j.egypro.2017.10.130
 A. Rodrigues, J. C. Bordado and R. G. D. Santos, “Upgrading the glycerol from biodiesel production as a source of energy carriers and chemicals-A technological review for three chemical pathways,” Energies, vol. 10, no. 11, p. 1817, 2017. https://doi.org/10.3390/en10111817
 W. Gao, M. Zhang and H. Wu, “Differential Scanning Calorimetry Studies on the Cold Flow Properties of Fuel Mixtures from Bio-Oil, Crude Glycerol, Methanol, and/or Biochar,” Energy & Fuels, vol. 31, no. 8, pp. 8348-8355, 2017. https://doi.org/10.1021/acs.energyfuels.7b01475
 M. Bogataj and M. J. Bagajewicz, “Synthesis of non-isothermal heat integrated water networks in chemical processes,” Computers & Chemical Engineering, vol. 32, no. 12, pp. 3130-3142, 2008. https://doi.org/10.1016/j.compchemeng.2008.05.006
 L. Ma, E. Lv, L. Du, J. Lu and J. Ding, “Statistical modeling/optimization and process intensification of microwave-assisted acidified oil esterification,” Energy Conversion and Management, vol. 122, pp. 411-418, 2016. https://doi.org/10.1016/j.enconman.2016.06.001
 P. Ghorbannezhad, A. Bay, M. Yolmeh, R. Yadollahi and J. Y. Moghadam, “Optimization of coagulation-flocculation process for medium density fiberboard (MDF) wastewater through response surface methodology,” Desalination and Water Treatment, vol. 57, no. 56, pp. 26916-26931, 2016. https://doi.org/10.1080/19443994.2016.1170636
 S. Samsuri, N. A. Amran, L. J. Zheng and M. M. M. Bakri, “Effect of coolant temperature and cooling time on fractional crystallization of biodiesel and glycerol,” Malays. J. Fundam. Appl. Sci, vol. 13, pp. 676-679, 2017. https://doi.org/10.11113/mjfas.v13n4.925
 J. Van Gerpen and G. Knothe, “Bioenergy and biofuels from soybeans,” in Soybeans, New York, AOCS Press, 2008, pp. 499-538. https://doi.org/10.1016/B978-1-893997-64-6.50019-6
 F. J. Eisenbart and J. Ulrich, “Solvent-aided layer crystallization-Case study glycerol-water,” Chemical Engineering Science, vol. 133, pp. 24-29, 2015. https://doi.org/10.1016/j.ces.2014.12.060