EPR, UV and IR Spectroscopic Methods for the Study of Crude
DOI:
https://doi.org/10.15377/2409-787X.2026.13.1Keywords:
IR, UV, EPR, Radicals, Luminescence, Heavy petroleum residues, Substituted aromatic hydrocarbons, Aromatic hydrocarbons (I–IV groups).Abstract
This work for first time the systematizes research data obtained by EPR, UV, IR spectroscopy, and luminescence methods for light, medium, and heavy Azerbaijani crude oils. In light Surakhany oil (685 m depth), EPR analysis revealed asphaltene radicals and signals of metal oxides. The composition, kerosene, and diesel fractions of commercial oils from Sangachal-Deniz, Bulla-Deniz, Khara-Zira, and Alat-Deniz (ρ = 812.4 kg/m³) were studied, where EPR spectra of Co, Mo, and Mn were detected. The composition, physicochemical properties, and paramagnetism of Zagly oil were examined together with aromatic hydrocarbons of groups I–IV. In group III, an EPR signal with ΔH = 7.5 mT and g = 2.4 was recorded. Groups I–III contain small amounts of benzene, naphthalene, phenanthrene, and anthracene derivatives. Kerosene fractions of heavy West Absheron oil (ρ = 912.5 kg/m³) exhibited a similar EPR signal (ΔH = 7.5 mT, g = 2.4), also observed in group III aromatic hydrocarbons of Zaqly oil. In diesel fractions, an EPR signal with ΔH = 1.1 mT and g = 2.0023 was detected, corresponding to group II aromatic hydrocarbons. UV spectroscopy and luminescence measurements indicate that these radicals belong to substituted aromatic hydrocarbons. Balakhany oil (ρ = 919 kg/m³) was investigated, with particular attention to aromatic hydrocarbons containing three or more condensed benzene rings responsible for visible luminescence. Absheron oil (ρ = 920 kg/m³), its 50-degree fractions, and heavy petroleum residues were also studied. Residues from primary processing exhibit lower aromatic hydrocarbon content, improved environmental characteristics, and significant resource potential.
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Copyright (c) 2026 Maisa A. Najafova, Yusura A. Abdullayeva, Saida F. Akhmedbekova, Mamed A. Bayramov
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