Abstract
The methods of 1 H, 13C NMR-spectroscopy were used to study the fragmentary compositions of oil from the Karazhanbas, Zhangurshi deposits (Kazakhstan) and heavy oil residues obtained before and after the electrohydraulic effect of water hammer after topping a light fraction of oil products. Their fragmentary composition were determined by the value of integrated intensities of 1 H, 13C NMR signals of the oil under study. The obtained results have shown that the composition of oil samples understudy includes terminal CH3-groups of long alkyl chains having a value of 0.87 ppm. The presence of long alkyl chains of oil components imparts a high viscosity and bituminous consistency to the latter. The content of aromatic protons according to the integrated intensities of 1 H NMR in both oil samples does not exceed 2.08%; but there are no aromatic nuclei by the integral intensities of carbon atoms at all. The low content of protons of Hα-type in hydrocarbon crude (5.2–5.3%) indicates a low content of aromatic and carbonyl carbons as well as heteroatoms in the studied samples. The content of the greater proportion of protons of the Hγ-type in Karazhanbas oil (33.0%) compared to the Zhangurshi oil (23.8%) indicates a greater length of aliphatic hydrocarbons of the latter and its increased viscosity.
Highlights
A modern high-resolution NMR-spectroscopy, being a method of both qualitative and quantitative analysis is widely used to carry out control over the quality of oil and petroleum products [1,2,3,4,5]
The obtained results have shown that the composition of oil samples understudy includes terminal CH3-groups of long alkyl chains having a value of 0.87 ppm
To determine the fragmentary composition of oil by the NMR spectroscopy method, the spectrum 1H and 13C of oil and oil products is divided into several ranges of chemical shifts corresponding to different molecular fragments
Summary
A modern high-resolution NMR-spectroscopy, being a method of both qualitative and quantitative analysis is widely used to carry out control over the quality of oil and petroleum products [1,2,3,4,5]. The qualitative indicators of oil and oil products have been laid in their elemental, structural – group, fragmented and compositional analysis, which are “encrypted” in quantitative form in NMR spectra of hydrogen and carbon of oil objects [3]. The purpose of the study is the NMR-spectroscopic determination of fragmentary oil composition of the Karazhanbas, Zhangurshi deposits as well as heavy oil residue of Kazakhstan obtained before and after the electrohydraulic effect of water hammer after topping a light fraction of oil products. NMR-Spectrometric Determination of the Fragmented Oil Composition from the Karazhanbas
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