Data on the hydrocarbon composition of straight-run oil fractions are required to choose methods for their use directly after primary oil refining (fractionation) and subsequent secondary processing. The paper presents the results of determining the group hydrocarbon composition of straight-run oil narrow-temperature fractions (paraffins, naphthenes, aromatic hydrocarbons) by the refracto-densimetric method. We used the additivity of the characteristics (in terms of mass fractions of group components), i.e., derivatives of the refractive index and fraction density (specific refraction and specific volume). The values of group narrow-temperature hydrocarbon reference points were estimated proceeding from data on the initial refracto-densimetric characteristics of fractions and their dearomatized parts and data of gas-liquid chromatography. It is shown that the paraffin reference points are quite close to the reference points determined by chromatographic data. The values of narrow-temperature group reference points can be adjusted using available chromatographic data on the individual hydrocarbon composition of wide straight-run oil fractions. A method for determining the reliability of measurements using Kurtz – Lorentz maps is proposed. The results obtained can be used in the group analysis of hydrocarbon composition in production conditions in real time in situ performed both on ELOU AVT industrial installations and ARN-2 laboratory fractional distillation installations when installing in-line refractometers and densimeters or combined in-line refracto-densimetric analyzers.
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Николаев et al. (2024) studied this question.
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