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Molecular Mobility of Crude Oils via Electron Paramagnetic Resonance of Organic Free Radicals
Abstract
This study aimed to investigate the molecular mobility of crude oils using the linewidth of the free radical electron paramagnetic resonance signal (EPR) as a molecular mobility probe. For this, aromatic and paraffinic crude oil samples were analyzed by X-band EPR spectroscopy, NMR experiments in time domain (TD-NMR), and rheometry. The variations on the half height linewidth with temperature presented a similar behavior for both samples, being related to different molecular mobility regimes. EPR results were compared to the variation of viscosity with temperature obtained by rheometry and TD-NMR. The results showed changes in the decrease trend of viscosity for the paraffinic sample at a temperature close to the range in which it is observed the transition from rigid to liquid regime in the EPR analysis. EPR technique showed more detailed information about the regime transition for the oil samples studied, which is in agreement with the results obtained by rheometry and TD-NMR.
Keywords
petroleum,
electron paramagnetic resonance,
NMR experiments in time domain,
viscosity,
temperature variation,
asphaltene
Supporting agencies: We would like to thank Mr. Sohail Mohammad for providing the samples; “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior” (CAPES-Brazil) and “Conselho Nacional de Desenvolvimento Científico e Tecnológico” (CNPq-Brazil) for financial support; the Magnetic Resonance, Spectroscopy and Magnetism Group from University of São Paulo, São Carlos Institute of Physics, for the viscosity TD-NMR measurements, and LNNA/Embrapa for rheometry measurements.
About the Authors
A. Khan
Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL)
Brazil
Brazil
Londrina
D. F. Valezi
Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL)
Brazil
Brazil
Londrina
M. T. Picinato
Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL); Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná (UTFPR)
Brazil
Brazil
Londrina
B. L. S. Vicentin
Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL)
Brazil
Brazil
Londrina
A. M. Netto
Braskem S.A. São Paulo
Brazil
Brazil
SP
A. C. G. Mantovani
Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL)
Brazil
Brazil
Londrina
E. Di Mauro
Laboratório de Ressonância Paramagnética Eletrônica (LARPE), Departamento de Física, Universidade Estadual de Londrina (UEL)
Brazil
Brazil
Londrina
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Review
For citations:
Khan A., Valezi D.F., Picinato M.T., Vicentin B.S., Netto A.M., Mantovani A.G., Di Mauro E. Molecular Mobility of Crude Oils via Electron Paramagnetic Resonance of Organic Free Radicals. Zhurnal Prikladnoii Spektroskopii. 2022;89(1):138-143.
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