Determination of the aromatics content in mineral oils by LF NMR

M.G. Fazlyyyakhmatov ^a,b*, I.N. Shamanov ^a**, B.V. Sakharov ^a,c***, N.M. Khasanova ^a****,

M.A. Varfolomeev ^a*****, G.G. Samosorov ^d******, M.O. Pastukhov ^d*******

^aKazan Federal University, Kazan, 420008 Russia

^bKazan National Research Technical University named after A.N. Tupolev – KAI, Kazan, 420111 Russia

^cState Research Center for Applied Microbiology and Biotechnology, Obolensk village, Serpukhov district, Moscow region, 142279 Russia

^dCentral Forensic Customs Administration, Moscow, 125130 Russia

E-mail: ^*mfazlyjy@kpfu.ru, ^**insafsh77@gmail.com, ^***saharoff2010@yandex.ru,
 ^****nkhasano@yandex.ru, ^*****mikhail.varfolomeev@kpfu.ru,
^******cektu@ca.customs.gov.ru, ^*******pastukhovMO@ca.customs.gov.ru

Received June 19, 2023; Accepted July 24, 2023

ORIGINAL ARTICLE

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DOI: 10.26907/2542-064X.2023.2.322-339

For citation: Fazlyyyakhmatov M.G., Shamanov I.N., Sakharov B.V., Khasanova N.M., Varfolomeev M.A., Samosorov G.G., Pastukhov M.O. Determination of the aromatics content in mineral oils by LF NMR. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2023, vol. 165, no. 2, pp. 322–339. doi: 10.26907/2542-064X.2023.2.322-339. (In Russian)

Abstract

Molecular group composition analysis of mineral oils is helpful to predict the performance of a future lubricant and to assess the compatibility of plasticizer oil with rubbers. The method of pulsed low-frequency NMR relaxation was used to determine the molecular group composition of 11 mineral oil samples, and the ratio of aromatic and non-aromatic hydrocarbons in them was calculated. NMR measurements were performed on a Chromatec-Proton 20M NMR analyzer with a 1H resonance frequency of 20 MHz. The method used consists in recording free induction decay signals, reconstructing the total signal amplitude, estimating the relative signal amplitude per unit mass of the sample, and calculating the proportion of aromatic hydrocarbons in the sample. The results were compared with those obtained by the standard chromatographic method. A high degree of correlation (R² = 0.99) was observed between the results.

Keywords: NMR relaxation, FID, mineral oils, relative hydrogen index, relative proton density, RHI

Figure Captions

Fig. 1. FID signals of oil samples А.1–А.11 with known aromatics content.

Fig. 2. Correlation dependence of RHI values in two models.

Fig. 3. Correlation dependence of aromatics content based on NMR relaxation data and the method described in Appendix A.

Fig. 4. NMR relaxation signals in a series of CPMG pulse sequence of oil samples А.1–А.11 with known aromatics content.

Fig. 5. Correlation dependence of dynamic viscosity on spin-spin NMR relaxation rate of oil samples A.4–A.11.

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