A Comparative Analysis of Vanadyl Porphyrins Isolated from Resins of Heavy Oils with High and Low Vanadium Content

Makhmut Yakubov,Guzalia Abilova,Nikolay Mironov,Dmitriy Milordov,Svetlana Yakubova,Damir Tazeev,Elvira Tazeeva

doi:10.3390/pr9122235

Makhmut Yakubov, Guzalia Abilova + Show 5 more

Open Access

https://doi.org/10.3390/pr9122235

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Abstract

The composition of purified vanadyl porphyrins recovered from the resins of heavy oils possessing high and low vanadium contents was investigated. Vanadium content in the resins of the heavy oils under study differs by a factor of ca. 15. To recover and purify vanadyl porphyrins from the resins, extraction by N,N–dimethylformamide (DMF) with subsequent two-stage column chromatography on silica gel and sulfocationite were employed. The change of structural-group composition and content of vanadyl porphyrins in the products obtained at each stage was evaluated using Fourier IR and UV-Vis spectroscopy. Analysis of the purified vanadyl porphyrins using MALDI mass spectrometry determined distribution of their most abundant types (etio- and DPEP) and identified C27–C39 homologs for the resins possessing high vanadium content and C28–C39 homologs for the resins with low vanadium content.

Highlights

Growing demand in motor fuels stimulates an increase in recovery and upgrading of heavy oil (HO) featuring a high content of resinous and asphaltene components and heteroatomic sulfur, nitrogen, and oxygen-containing compounds, as well as vanadyl and nickel metal complexes [1,2]
Heavy oil with the increased vanadium content can be considered to be the source of natural porphyrins, which are accumulated in resin and asphaltene components [16]
There are more asphaltenes and resins and there is a higher density in HO no. 2

Summary

Introduction

Growing demand in motor fuels stimulates an increase in recovery and upgrading of heavy oil (HO) featuring a high content of resinous and asphaltene components and heteroatomic sulfur-, nitrogen-, and oxygen-containing compounds, as well as vanadyl and nickel metal complexes [1,2]. Heavy oil with the increased vanadium content can be considered to be the source of natural porphyrins, which are accumulated in resin and asphaltene components [16].

Results

Conclusion