OPTIMIZATION OF REACTION TIME IN THE TRANSESTERIFICATION OF DISTILLED-WATER-WASHED USED COOKING OIL INTO FATTY ACID METHYL ESTERS
DOI:
https://doi.org/10.21580/wjc.v9i1.31966Keywords:
Used Cooking Oil, Fatty Acid Methyl Ester, Transesterification, Acid Value, GC-MSAbstract
Fatty acid methyl ester (FAME) is an alternative to fossil diesel fuel that can be synthesized from used cooking oil (UCO). UCO requires pretreatment before it can be used for FAME synthesis because of its high acid value. Pretreatment of UCO using distilled-water washing reduced the acid value from 11.80 mg KOH/g to 3.49 mg KOH/g. The treated UCO was reacted with methanol through transesterification at reaction times of 90, 120, 150, and 180 min to produce FAME. The acid value decreased with increasing reaction time, from 1.57 mg KOH/g at 90 min to 0.97 mg KOH/g at 120 min and 0.43 mg KOH/g at 150 min. However, the acid value increased again at 180 min to 1.10 mg KOH/g, which was attributed to the reversible nature of the reaction. The FAME sample with the lowest acid value was analyzed using GC–MS, and five methyl esters were identified: methyl myristate (2.86%), methyl palmitate (65.88%), methyl oleate (19.25%), methyl stearate (10.85%), and methyl arachidate (0.10%), along with other compounds (1.06%). FAME synthesized from UCO pretreated by distilled-water washing has the potential to reduce large-scale FAME production costs because the distilled-water washing process is highly economical.
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[1] S. Khosa, M. Rani, M. Saeed, S. D. Ali, A. Alhodaib, and A. Waseem, “A Green Nanocatalyst for Fatty Acid Methyl Ester Conversion from Waste Cooking Oil,” Catalyst, pp. 1–20, 2024, doi: https://doi.org/10.3390/ catal14040244 Academic.
[2] N. A. S. Shukor, I. Yusof, W. Z. Samad, S. H. Saleh, and N. Hamzah, “Synthesis and Characterization of KOH / Bentonite Catalyst for Transesterification of Waste Cooking Oil into Fatty Acid Methyl Esters,” Malaysian J. Chem., vol. 26, no. 5, pp. 315–326, 2024, doi: https://doi.org/10.55373/mjchem.v26i5.315.
[3] M. Hasan Abdullah, O. A. Wahyu Riyanto, and D. P. IBSW, “Optimization of Esterification and Transesterification Processes for Biodiesel Production from Used Cooking Oil,” J. Res. Technol., vol. 7, no. 2, pp. 207–216, 2021, doi: https://doi.org/10.55732/jrt.v7i2.432.
[4] J. R. Joshi, K. K. Bhanderi, and J. V. Patel, “Waste cooking oil as a promising source for bio lubricants- A review,” J. Indian Chem. Soc., vol. 100, no. 1, p. 100820, 2023, doi: 10.1016/j.jics.2022.100820.
[5] A. Salihu, A. A. Mahmood, S. Gimba, P. Nzerem, and I. Okafor, “Production of Biodiesel from Waste Cooking Oil by Transesterification Process using Heterogeneous Catalyst,” Niger. J. Environ. Sci. Technol., vol. 5, no. 2, pp. 501–510, 2021, doi: 10.36263/nijest.2021.02.0308.
[6] M. Putri, L. Kalsum, and A. Syarif, “Waste-Cooking-Oil Free Fatty Acid Reduction Using Deep Eutectic Solvent as Raw Material of Biodiesel,” Indones. J. Fundam. Appl. Chem., vol. 6, no. 2, pp. 40–45, 2020, doi: 10.24845/ijfac.v6.i2.40.
[7] M. U. H. Suzihaque, N. Syazwina, H. Alwi, U. K. Ibrahim, S. Abdullah, and N. Haron, “A sustainability study of the processing of kitchen waste as a potential source of biofuel: Biodiesel production from waste cooking oil (WCO),” Mater. Today Proc., vol. 63, pp. S484–S489, Jan. 2022, doi: 10.1016/J.MATPR.2022.04.526.
[8] S. Khuzaimah and N. Eralita, “Utilization of Adsorbent Carbon Coconut Shell for Purification of Used Cooking Oil,” IJCA (Indonesian J. Chem. Anal., vol. 3, no. 2, pp. 88–95, 2020, doi: 10.20885/ijca.vol3.iss2.art7.
[9] E. A. Utami, U. K. Nizar, and S. B. Etika, “Peningkatan Pemurnian Minyak Jelantah melalui Sistem Adsorben Ganda: Bleaching Earth dan Karbon dari Kulit Buah Kakao (Theobroma cacao L),” J. Pendidik. dan Sains, vol. 5, pp. 1368–1392, 2025, doi: https://doi.org/10.58578/masaliq.v5i3.6039.
[10] S. N. Shahdan and R. S. F. N. Hirzin, “Pre-Treatment of Used Cooking Oil Followed by Transesterification Reaction in the Production of Used Cooking Oil-Based Polyol,” Sci. Res. J., vol. 18, no. 2, pp. 129–146, 2021, doi: 10.24191/srj.v18i2.13749.
[11] H. S. Ahmad, N. Bialangi, and Y. K. Salimi, “Pengolahan Minyak Jelantah Menjadi Biodiesel,” J. Entropi, vol. 11, pp. 204–214, 2016.
[12] D. Silsia, F. E. D. Surawan, and I. Meiriska, “KARAKTERISTIK EMULSIFIER MONO DAN DIASILGLISEROL (MDAG) DARI CRUDE PALM OIL (CPO) YANG BERASAL DARI FAT PIT PADA BERBAGAI KONSENTRASI KATALIS NaOH CHARACTERISTICS OF MONO AND DIACYLGLYCEROL (MDAG) EMULSIFIERS FROM CRUDE PALM OIL (CPO) WHICH COMES FROM FAT,” J. Teknol. dan Ind. Pertan. Indones., no. 02, 2017, doi: https://doi.org/10.17969/jtipi.v9i2.9973.
[13] N. S. A. Zamanhuri, M. F. Hanafi, and N. Sapawe, “Characterization and physicochemical properties of biodiesel produced from waste cooking oil (WCO) using magnetic alumina-ferric oxide nanoparticles catalyst,” Mater. Today Proc., vol. 31, no. 2020, pp. A122–A125, 2020, doi: 10.1016/j.matpr.2021.01.035.
[14] A. Firmansyah, Y. Zetra, R. Y. P. Burhan, D. Prasetyoko, and N. Jamarun, “Synthesis of 2-Hydroxyethyl Esters from Castor Oil as Lubrication Bio-Additive Candidates for Low-Sulfur Fossil Diesel,” Indones. J. Chem., vol. 22, no. 3, pp. 845–856, 2022, doi: 10.22146/ijc.73038.
[15] J. Francisco, L. Carmen, M. Torres, Q. Zhang, and P. Á. Mateos, “Determination of the Acidity of Waste Cooking Oils by Near Infrared Spectroscopy,” Processes, pp. 1–7, 2019, doi: https://doi.org/10.3390/pr7050304.
[16] J. Nie, J. Shen, Y. Y. Shim, T. J. Tse, and M. J. T. Reaney, “Synthesis of Trimethylolpropane Esters by Base-Catalyzed Transesterification,” Eur. J. Lipid Sci. Technol., vol. 122, no. 3, pp. 1–10, 2020, doi: 10.1002/ejlt.201900207.
[17] R. Z. K. Hussein, N. K. Attia, M. K. Fouad, and S. T. ElSheltawy, “Experimental investigation and process simulation of biolubricant production from waste cooking oil,” Biomass and Bioenergy, vol. 144, p. 105850, Jan. 2021, doi: 10.1016/J.BIOMBIOE.2020.105850.
[18] A. Santoso, Abdurrohman, A. R. Wijaya, D. Sukarianingsih, Sumari, and D. E. K. Putri, “Synthesis of methyl ester from rice bran oil through the esterification reaction,” Key Eng. Mater., vol. 851 KEM, no. July, pp. 164–171, 2020, doi: 10.4028/www.scientific.net/KEM.851.164.
[19] Maulidiyah, M. Nurdin, F. Fatma, M. Natsir, and D. Wibowo, “Characterization of methyl ester compound of biodiesel from industrial liquid waste of crude palm oil processing,” Anal. Chem. Res., vol. 12, pp. 1–9, 2017, doi: 10.1016/j.ancr.2017.01.002.
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