Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10893310.54859/kjogi108933Research ArticleOptimization results of the ELOU-AVT unit at the Atyrau Oil RefineryKarabassovaNagima A.nagima@inbox.ruhttps://orcid.org/0000-0001-6121-1125KayrliyevaFazilat B.<p>Cand. Sc. (Engineering)</p>kairliyeva.fazi@mail.ruhttps://orcid.org/0000-0001-5323-0916ShambilovaGulbarshin K.<p>Doct. of Sc. (Chemistry)</p>shambilova_gulba@mail.ruhttps://orcid.org/0000-0002-2733-986XShiriyazdanovRishat R.<p>Cand. Sc. (Engineering)</p>petroleum9@bk.ruhttps://orcid.org/0009-0009-6770-3820Atyrau Oil and Gas University named after Safi UtebaevUfa State Petroleum Technological University010420268189973010202505022026Copyright © 2026, Karabassova N.A., Kayrliyeva F.B., Shambilova G.K., Shiriyazdanov R.R.2026<p><strong>Background:</strong> Increasing the depth of oil refining and improving the quality of commercial petroleum products are directly related to the efficiency of primary processing, particularly atmospheric oil distillation. This problem is extremely relevant for the modern oil and gas industradoy, since primary crude oil processing units operating in Kazakhstan were constructed during the Soviet period and therefore require modernization.</p> <p><strong>Aim: </strong>Development and experimental evaluation of technological methods for intensifying atmospheric and vacuum crude oil distillation at the ELOU-AVT unit of the Atyrau Refinery, aimed at reducing the content of light fractions in fuel oil and increasing the yield of valuable distillate products.</p> <p><strong>Materials and methods: </strong>To study the fractional composition of fuel oil, the ARN laboratory setup was used. Data from analytical control of ELOU-AVT products and material balance calculations are presented. Diagrams illustrating the yield of light petroleum products were constructed to visualize the obtained results.</p> <p><strong>Results: </strong>Based on laboratory research, it was found that the content of light petroleum products in fuel oil exceeded the norm. To increase the yield of vacuum gas oil, raise the coke residue of the tar, and reduce the output of fuel oil at the ELOU-AVT unit, technological measures were implemented to increase the supply of live steam to the bottom of the atmospheric column and reduce its consumption in the vacuum column. During the experimental and design phase, the content of light petroleum products in fuel oil was reduced from 7% to 5.5%. The coke residue of tar increased from 10.199% to 10.619%. An increase in the yield of gasoline, jet fuel, vacuum gas oil, and vacuum diesel fuel was recorded.</p> <p><strong>Conclusion: </strong>The calculations and analysis carried out confirm the feasibility of investing in the development of a modernized autonomous oil platform that has improved ice resistance and meets all safety requirements for operation in the North Caspian Sea.</p>fuel oilatmospheric-vacuum distillationsteam supplylight petroleum productsoil refining depthмазутатмосфералық-вакуумдық айдаубу беружеңіл мұнай өнімдерімұнай өңдеу тереңдігімазутатмосферно-вакуумная перегонкаподача парасветлые нефтепродуктыглубина переработки нефти1.Medvedev IS, Dyachkova SG. Improving the efficiency of the atmospheric distillation column by controlling excess evaporation in the tube furnace. Industrial processes and technologies. 2025;5(2(16)):95–105. doi: 10.37816/2713-0789-2025-5-2(16)-95-105. (In Russ).2.Sotelo D, Favela-Conteras A, Sotelo C, et al. Design and implementation of a control structure for quality products in a crude oil atmospheric distillation Column. ISA Transactions. 2017;71:573–584. doi: 10.1016/J.Isatra.2017.08.005.3.Bazarov G, Ikromov S. Effective options of oil refining to increase the output of disstillate. The Scientific Heritage. 2021;68-1:11–15. doi: 10/24412/9215-0365-2021-68-1-11-15. (In Russ).4.Kapitonova OV, Osipov EV. Nalozheniye neftyanykh fraktsiy pri razdelenii mazuta pod vakuumom. Herald of Technological University. 2015;18(20):88–90. (In Russ).5.Likanov DA, Lubsandorzhiyeva LK, Kostina TV, Kuzora IE. Optimizatsionnyye meropriyatiya dlya snizheniya svetlykh fraktsiy v mazute na ustanovkakh AVT. Neftepererabotka I neftekhimiya. 2013;1:3–5. (In Russ).6.Makasheva D. Modeling and Optimization of AVT-3 and AT-2 Crude Oil Distillation Units at Atyrau Refinery. Herald of The Kazakh-British Technical University. 2022;19(3):15–22. doi: 10.55452/1998-6688-2022-19-3-15-22. (In Russ).