Kinetic Analysis of Saponification Reaction in Eco-Friendly Soap Production Based on Waste Cooking Oil

Authors

  • Apri Wahyudi Tanjungpura University, Indonesia
  • Berlian Sitrous Tanjungpura University, Indonesia
  • Ferdinand Hidayat Tanjungpura University, Indonesia

DOI:

https://doi.org/10.33394/hjkk.v13i3.14828

Keywords:

reaction kinetics, saponification, soap, wasted cooking oil

Abstract

This study aims to determine the kinetics of the saponification reaction in making solid soap from wasted cooking oil and its effect on the quality of the solid soap produced. The novelty of this study lies in evaluates the effect of different NaOH concentrations and reaction durations on the the kinetic model with quality parameters (free fatty acid, free alkali content, and pH) to demonstrating that a pseudo second order reaction mechanism contributes to superior soap characteristics. The method begins with the refining of wasted cooking oil using activated carbon, making solid soap from refined oil with variations in NaOH concentrations of 1; 1.5; and 2 M in 30; 45; and 60 minutes. Determination of reaction kinetics was carried out by titrimetry and testing the quality of solid soap with parameters of free fatty acid content, free alkali, and degree of acidity (pH) based on SNI 3532-2021. The results showed that the saponification reaction followed 2nd order pseudo kinetics. This is supported by the value of the reaction constant reaching 1.0995 min-1 and the coefficient of determination R2= 0,9954. The optimum variation of solid soap obtained is 2 M NaOH concentration in 60 minutes. Soap products produced through pseudo second-order reaction kinetics have high quality with a white appearance, no rancid odor, smooth and soft texture. This is evidenced by the parameters of free fatty acid and free alkali content of 0.1126% and 0.016%. The degree of acidity (pH) of the solid soap produced is also in the range of 9.5-10. All of these parameters have met the criteria for solid soap according to SNI 3532: 2021.

Author Biography

Apri Wahyudi, Tanjungpura University

Department of Chemistry

References

Alum, B. N. (2024). Saponification Process and Soap Chemistry. Inosr Applied Sciences, 12(2), 51–56. https://doi.org/10.59298/inosras/2024/12.2.515600

Baena, A., Orjuela, A., Rakshit, S. K., & Clark, J. H. (2022). Enzymatic hydrolysis of waste fats, oils and greases (FOGs): Status, prospective, and process intensification alternatives. Chemical Engineering and Processing-Process Intensification, 17(5): 108-120. https://doi.org/10.1016/j.cep.2022.108930

Çitak, A., & Kivrak, A. (2019). Determination of the Expression Rate of Ethyl Acetate Hydrolysis Reaction Depending on the Temperature. Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 9(1), 382–388. https://doi.org/10.21597/jist.410336

Heraldy, E., Purnamawati, N., Hidayat, Y., Noegrahaningtyas, K. D., & Nurcahyo, I. F. (2022). Preparation of Biosorbent from Kapok Fruit Peel (Ceiba pentandra) for Adsorption of Lead Waste. Jurnal Kimia Sains Dan Aplikasi, 25(9), 329–337. https://doi.org/10.14710/jksa.25.9.329-337

Hesni, Y., Ginting, Z., Sylvia, N., Masrullita, M., & Mulyawan, R. (2022). Pembuatan Sabun Batang Organik (Opaque) dari Teh Daun Kopi Gayo Robusta. Chemical Engineering Journal Storage (CEJS), 2(3), 35–48. https://doi.org/10.29103/cejs.v2i3.6806

Kementerian Lingkungan Hidup and Kehutanan. (2022). Status Lingkungan Hidup Indonesia 2022 Nomor 97 Tahun 2017 Tentang Kebijakan and Strategi Nasional Pengelolaan Sampah Rumah Tangga (SRT) and Sampah Sejenih Rumah Tangga (SSRT): Jakarta.

Khuzaimah, S. (2018). Pembuatan Sabun Padat Dari Minyak Goreng Bekas Ditinjau Dari Kinetika Reaksi Kimia. Jurnal Teknik Kimia, 19(2), 42–48.

Kurniawan, A., Oko, S., & Muslimin, N. A. 2020). Pemurnian minyak jelantah dengan metode adsorbsi menggunakan arang aktif dari serbuk gergaji kayu ulin (Eusideroxylon zwageri). Jurnal Riset Teknologi Industri, 14(2): 124–132. https://doi.org/10.26578/jrti.v14i2.6067

Laborda, E., Lópezâ€Asanza, J., Morenoâ€Molina, J., Gonzalez, J., & Molina, A. (2025). Currentâ€Potentialâ€Time Response of the Secondâ€Order Coâ€Reactant Mechanism: An Analytical Theoretical Approach. ChemElectroChem, 12(5), 1-7.

Low, S. J. (2017). Determination of Activation Energy of Saponification Reaction through pH Analysis. Research & Reviews: Journal of Chemistry, 6(1), 1–5.

Mardawati, E., Hidayat, M. S., Rahmah, D. M., & Rosalinda, S. (2019). Produksi biodiesel dari minyak kelapa sawit kasar off grade dengan variasi pengaruh asam sulfat pada proses esterifikasi terhadap mutu biodiesel yang dihasilkan. Jurnal Industri Pertanian, 1(3): 46-60.

Vicentini, P., C., Rodolfo Ramos, P., Bernardo Gonçalves, C., & Oliveira, A. (2021). Determination of free fatty acids in crude vegetable oil samples obtained by high-pressure processes. Food Chemistry, 12(1), 100166. https://doi.org/10.1016/j.fochx.2021.100166

Nitbani, F. O., Tjitda, P. J. P., Nurohmah, B. A., & Wogo, H. E. (2020). Preparation of fatty acid and monoglyceride from vegetable oil. Journal of Oleo Science, 69(4), 277–295. https://doi.org/10.5650/jos.ess19168

Pasaribu, M. H. (2022). Studi Kinetika Kimia pada Reaksi Saponifikasi Etil Asetat dengan Metode Titrasi dan Konduktometri. Jurnal Jejaring Matematika Dan Sains, 4(2), 58. https://doi.org/10.36873/jjms.2022.v4.i2.710

Puspitasari, A., Erlita, D., Maria, E., & Mudawah, A. (2023). Pengembangan Produk Baru Sabun Padat Dari Minyak Jelantah. Jurnal Rekayasa Lingkungan, 23(2), 60–66. https://doi.org/10.37412/jrl.v23i2.205

Salanti, J. F., Momuat, L. I., Koleangan, H. S. J., Kimia, P. S., Matematika, F., Alam, P., & Ratulangi, U. S. (2022). Quality Testing and Antioxidant Activity of Soap Contains Algae Extract Eucheuma spinosum Pengujian Kualitas dan Aktivitas Antioksidan dari Sabun Mandi Padat Mengandung Ekstrak Alga Eucheuma spinosum. Jurnal Ilmiah Sains, 22(2), 172–179.

Standar Nasional Indonesia. (2021). SNI 3532:2021 Tentang Sabun Mandi Padat. Dewan Standarisasi Nasional: Jakarta.

Wangi, I. P., Supriyanto, Sulistyo, H., & Hidayat, C. (2024). High shear reactor for glycerolysis—Interesterification palm stearinâ€olein blend: Reaction kinetics and physical properties. Journal of the American Oil Chemists' Society, 101(6), 589-600. https://doi.org/10.1002/aocs.12803

Winanti, D. E. M., & Gultom, F. B. (2024). Pembuatan Sabun Padat dari Minyak Kelapa Dengan Penambahan Gel Lidah Buaya (Aloe vera) Menggunakan Metode Cold Process. Jurnal Laboratorium Sains Terapan, 1(1), 12–17.

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Published

2025-07-17

How to Cite

Wahyudi, A., Sitrous, B., & Hidayat, F. (2025). Kinetic Analysis of Saponification Reaction in Eco-Friendly Soap Production Based on Waste Cooking Oil. Hydrogen: Jurnal Kependidikan Kimia, 13(3), 713–723. https://doi.org/10.33394/hjkk.v13i3.14828

Issue

Vol. 13 No. 3 (2025): June 2025

Section

Articles

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