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A Comparative Analysis of Vanadyl Porphyrins Isolated from Heavy Oil Asphaltenes with High and Low Vanadium Content

A Comparative Analysis of Vanadyl Porphyrins Isolated from Heavy Oil Asphaltenes with High and... The paper describes an investigation of the composition of purified vanadyl porphyrins recovered from heavy oil asphaltenes. For this purpose, high-vanadium crude oils from the Smorodinskoye field, Russia, were compared with low-vanadium crude oils from the Varadero field, Cuba. Based on the comparison of the FT-IR spectra of the asphaltenes, the distinctive features of their structural-group composition were identified. The vanadium content in the Smorodinskoye heavy oil asphaltenes was demonstrated to be 19-fold higher than that in the Varadero heavy oil asphaltenes. To recover and purify vanadyl porphyrins from the asphaltenes, extraction with N,N-dimethylformamide (DMF) followed by two-step column chromatography on silica gel and sulfocationite was employed. The compositions of the vanadyl porphyrin concentrates extracted from the heavy oil asphaltenes differing in vanadium content were identified using MALDI mass spectrometry, FT-IR spectroscopy, and UV-Visible spectroscopy.[graphic not available: see fulltext] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Petroleum Chemistry Springer Journals

A Comparative Analysis of Vanadyl Porphyrins Isolated from Heavy Oil Asphaltenes with High and Low Vanadium Content

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References (30)

Publisher
Springer Journals
Copyright
Copyright © Pleiades Publishing, Ltd. 2022. Translated from Neftekhimiya, 2022, Vol. 62, No. 1, pp. 99–110 https://doi.org/10.31857/S002824212201004X.
ISSN
0965-5441
eISSN
1555-6239
DOI
10.1134/s0965544122010030
Publisher site
See Article on Publisher Site

Abstract

The paper describes an investigation of the composition of purified vanadyl porphyrins recovered from heavy oil asphaltenes. For this purpose, high-vanadium crude oils from the Smorodinskoye field, Russia, were compared with low-vanadium crude oils from the Varadero field, Cuba. Based on the comparison of the FT-IR spectra of the asphaltenes, the distinctive features of their structural-group composition were identified. The vanadium content in the Smorodinskoye heavy oil asphaltenes was demonstrated to be 19-fold higher than that in the Varadero heavy oil asphaltenes. To recover and purify vanadyl porphyrins from the asphaltenes, extraction with N,N-dimethylformamide (DMF) followed by two-step column chromatography on silica gel and sulfocationite was employed. The compositions of the vanadyl porphyrin concentrates extracted from the heavy oil asphaltenes differing in vanadium content were identified using MALDI mass spectrometry, FT-IR spectroscopy, and UV-Visible spectroscopy.[graphic not available: see fulltext]

Journal

Petroleum ChemistrySpringer Journals

Published: Jan 1, 2022

Keywords: heavy oil; vanadium; asphaltenes; vanadyl porphyrins; extraction; chromatography

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