Study of quality indicators of fatty acids obtained during soapstock pro-cessing by three-stage technology
https://doi.org/10.20914/2310-1202-2025-1-54-63
Abstract
Fatty acids were obtained from soapstocks by a combined three-stage technology, which includes three consecutive stages: the first is saponification of the feedstock with a sodium hydroxide solution, the second is salting out with sodium chloride; the third is a two-stage hydrolysis and decomposition with a solution of sulfuric acid with a concentration of 10–12%, and then with sulfuric acid with a concentration of 80–92%. The organoleptic, physicochemical and other quality indicators of the fatty acids obtained under the rational conditions identified were determined. It was found that the fractional composition of the fatty acids obtained corresponded to the characteristics of fatty acids in first-grade light oils, indicating their high quality. The fatty acids have the following indicators: mass fraction of moisture and volatile substances – 1.8%, mass fraction of total fat – 97.1%, depth of oleic acid cleavage – 64.3%. Comparative analysis of the physicochemical indicators of fatty acids obtained by three methods: decomposition with sulfuric acid, saponification and decomposition with sulfuric acid and saponification, salting out and decomposition with sulfuric acid showed that the concentrations of the main fatty acids (stearic, oleic, linoleic acid) obtained by the third method (saponification, salting out and decomposition with sulfuric acid) were higher than those obtained by the first two methods.
About the Authors
A. N. Ostrikov
Voronezh State University of Engineering Technologies
Dr. Sci. (Engin.), professor, technology of fats, processes and devices of chemical and food production department, Revolution Av., 19 Voronezh, 394036, Russia
M. V. Kopylov
Voronezh State University of Engineering Technologies
Cand. Sci. (Engin.), assistant professor, technology of fats, processes and devices of chemical and food production department, Revolution Av., 19 Voronezh, 394036, Russia
N. I. Tsapkina
Voronezh State University of Engineering Technologies
graduate student, technology of fats, processes and devices of chemical and food production department, Revolution Av., 19 Voronezh, 394036, Russia
A. V. Terekhina
Voronezh State University of Engineering Technologies
Cand. Sci. (Engin.), assistant professor, technology of fats, processes and devices of chemical and food production department, Revolution Av., 19 Voronezh, 394036, Russia
V. N. Vasilenko
Voronezh State University of Engineering Technologies
Doc. Sci. (Engin.), professor, head of the department, machines and apparatuses of food production department, Revolution Av., 19 Voronezh, 394036, Russia
References
1. Abdikamalova A.B., Sharipova A.Sh., Artikova G.N., Seitnazarova O.M., Ismailov B.M. Methods of isolating fatty acids from soap. Sovremennye Innovatsii. 2016. no. 6(8). pp. 12–14. (in Russian).
2. Ostrikov A.N., Kopylov M.V., Tsapkina N.I. Method for obtaining fatty acids from vegetable oil soapstocks. Patent RU 2836916. 2025. Bulletin no. 9. Application no. 2024125531, filed 30.08.2024, published 24.03.2025. (in Russian).
3. Khamdamov M.B. Study of the possibilities of improving the technology for fatty acids production from cotton soapstocks. Multidisciplinary Scientific Journal. 2022. vol. 1. no. 2. pp. 385–388. (in Russian).
4. Alishahi A., Golmakani M., Niakousari M. Feasibility study of microwave assisted biodiesel production from vegetable oil refinery waste. European Journal of Lipid Science and Technology. 2021. vol. 123. no. 9. p. 2000377.
5. Barbusinski K., Fajkis S., Szeląg B. Optimization of soapstock splitting process to reduce the concentration of impurities in wastewater. Journal of Cleaner Production. 2021. vol. 280. p. 124459.
6. Casali B., Brenna E., Parmeggiani F., Tessaro D., Tentori F. Enzymatic methods for the manipulation and valorization of soapstock from vegetable oil refining processes. Sustainable Chemistry. 2021. vol. 2. no. 1. pp. 74–91. doi: 10.3390/suschem2010006.
7. Demidov I., Sytnik N., Mazaeva V. Sunflower and problem alternative fuel in Ukraine. Naukovo-tekhnichnyi Biuleten Instytutu Oliynykh Kultur NAAN. 2014. no. 21. pp. 137–146.
8. Dunn R.O. Correlating the cloud point of biodiesel with its fatty acid methyl ester composition: Multiple regression analyses and the weighted saturation factor (wSF). Fuel. 2021. vol. 300. p. 120820.
9. Ferrero G.O., Faba E.M.S., Eimer G.A. Biodiesel production from alternative raw materials using a heterogeneous low ordered biosilicified enzyme as biocatalyst. Biotechnology for Biofuels. 2021. vol. 14. no. 1.
10. Mashhadi F., Habibi A., Varmira K. Enzymatic production of green epoxides from fatty acids present in soapstock in a microchannel bioreactor. Industrial Crops and Products. 2018. vol. 113. pp. 324–334.
11. Pantoja S., Mescouto V., Costa C., Zamian J., Rocha Filho G., Nascimento L. High-quality biodiesel production from Buriti (Mauritia flexuosa) oil soapstock. Molecules. 2018. vol. 24. no. 1. p. 94.
12. Sytnik N., Kunitsia E., Kalyna V., Petukhova O., Ostapov K., Ishchuk V., Saveliev D., Kovalova T., Kostyrkin O., Petrova O. Technology development of fatty acids obtaining from soapstock using saponification. Eastern-European Journal of Enterprise Technologies. 2021. vol. 5. no. 6(113). pp. 16–23. doi: 10.15587/1729-4061.2021.241942.
13. Sytnik N., Kunitsia E., Mazaeva V., Kalyna V., Chernukha A., Vazhynskyi S., Yashchenko O., Maliarov M., Bogatov O., Bolibrukh B. Rational conditions of fatty acids obtaining by soapstock treatment with sulfuric acid. Eastern-European Journal of Enterprise Technologies. 2021. vol. 4. no. 6(112). pp. 6–13. doi: 10.15587/1729-4061.2021.236984.
14. Kalyna V., Koshulko V., Ilinska O., Tverdokhliebova N., Tolstousova O., Bliznjuk O., Gavrish T., Stankevych S., Zabrodina I., Zhulinska O. Development of soapstock processing technology to ensure waste-free and safe production. Eastern-European Journal of Enterprise Technologies. 2021. vol. 6. no. 10(114). pp. 23–29. doi: 10.15587/1729-4061.2021.245094.
15. Haas M.J. Improving the economics of biodiesel production through the use of low value lipids as feedstocks: vegetable oil soapstock. Fuel Processing Technology. 2005. vol. 86. no. 10. pp. 1087–1096.
16. Korchagin V.I., Protasov A.V., Melnova M.S., Cherkasova T.Yu., Kobzareva V.Yu. Limiting factors in obtaining prooxidants using a mixture of fatty acids extracted from soapstock. Vestnik Voronezhskogo Gosudarstvennogo Universiteta Inzhenernykh Tekhnologiy. 2017. vol. 79. no. 1. pp. 222–226. doi: 10.20914/2310-1202-2017-1-222-226. (in Russian).
17. Birta G., Levoshko N., Knysh V., Usenko S., Shostia A., Ovsiannikova T., Falalieieva T., Marushko L., Semenko Y., Zygin S. Identifying rational conditions for etherification of sunflower soapstock fatty acids. Eastern-European Journal of Enterprise Technologies. 2025. vol. 2. no. 6(134). p. 6. doi: 10.15587/1729-4061.2025.326031.
18. Shamuratov S.K.U., Karimov S.K., Baltaev U.S., Achilova S.S., Abdullayeva G.U.Q. Research into the study of saponification kinetics in the extraction of fatty acids from soapstock. Academic Research in Educational Sciences. 2022. no. 4. URL: https://cyberleninka.ru/article/n/research-into-the-study-of-safonification-kinetics-in-the-extraction-of-fatty-acids-from-soapstock. (accessed 04.06.2025).
19. Teryokhina A.V., Shcherbakov M.N. Study of fatty acid composition of vegetable oils. Proceedings of the Voronezh State University of Engineering Technologies. 2023. vol. 85. no. 1. pp. 111–117. doi: 10.20914/2310-1202-2023-1-111-117. (in Russian).
20. Khamdamov M.B. Study of the possibility of improving the technology of fatty acid production from cotton soapstocks. Research and Education. 2022. vol. 1. no. 2. pp. 385–388. (in Russian).
21. Panina E.V., Korolkova N.V., Sorokina I.A., et al. Resource-saving technologies in vegetable oil production. Tekhnologii i Tovarovedenie Sel'skokhozyaistvennoi Produktsii. 2020. no. 1. pp. 74–81. (in Russian).
22. Buklagin D.S. Deep processing of oil crops. Nauchno-informatsionnoe Obespechenie Innovatsionnogo Razvitiya APK. 2021. pp. 42–48. (in Russian).
Review
For citations:
Ostrikov A.N., Kopylov M.V., Tsapkina N.I., Terekhina A.V., Vasilenko V.N. Study of quality indicators of fatty acids obtained during soapstock pro-cessing by three-stage technology. Proceedings of the Voronezh State University of Engineering Technologies. 2025;87(1):54-63. (In Russ.) https://doi.org/10.20914/2310-1202-2025-1-54-63
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