Abstract
An adsorption-extrographic method was developed for preconcentration of petroleum vanadyl porphyrins from the dimethylformamide (DMF) extract of high-vanadium-content heavy petroleum asphaltenes. The procedure consists in preliminary adsorption of components present in the benzene solution of the DMF extract onto coarsely porous silica gel under the conditions of increased selectivity of the adsorbent to vanadyl porphyrins, followed by their elution from silica gel with chloroform. The development of the procedure is based on the results of a spectroscopy study of the adsorption of asphaltenes and vanadyl porphyrins present in the DMF extract of asphaltenes onto coarsely porous silica gel. The kinetics of the adsorption of asphaltenes and vanadyl porphyrins is described most adequately by a pseudo-second-order equation; both adsorbates are characterized by comparable rates of the attainment of the adsorption equilibrium. The equilibrium adsorption isotherms of asphaltenes and vanadyl porphyrins formally correspond to the Brunauer–Emmett–Teller multilayer adsorption model. The ability of silica gel for more selective adsorption of vanadyl porphyrins increases with a decrease in the initial concentration of the initial DMF extract of asphaltenes. The suggested adsorption-extrographic method allows preparation of a concentrate with ~20% higher content of vanadyl porphyrins having higher spectral purity, compared to the preconcentration by traditional preparative chromatography.
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The study was financially supported by the Russian Science Foundation (project no. 19-13-00089).
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N.A. Mironov: study of the relationships of the DMF extract of asphaltenes adsorption, construction of adsorption isotherms and kinetic curves, and major contribution to manuscript writing; E.G. Tazeeva: UV-Vis spectroscopic analysis of DMF extract of asphaltenes solutions and mathematical processing of the measurement results; D.M. Milordov: chromatographic preconcentration of vanadyl porphyrins and collection of literature data; G.R. Abilova: preparation of the DMF extract of asphaltenes and of figures for the paper; D.I. Tazeev: adsorption-extrographic preconcentration of vanadyl porphyrins; S.G. Yakubova: development of the experimental procedure, collection of literature data, and preparation of the literature review; M.R. Yakubov: development of the concept of the study, interpretation of the experimental data, and reviewing and writing of the manuscript.
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Translated from Zhurnal Prikladnoi Khimii, No. 9, pp. 1204–1213, January, 2021 https://doi.org/10.31857/S0044461821090115
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Mironov, N.A., Tazeeva, E.G., Milordov, D.V. et al. Adsorption-Extrographic Preconcentration of Petroleum Vanadyl Porphyrins from Dimethylformamide Extract of Heavy Petroleum Asphaltenes. Russ J Appl Chem 94, 1324–1333 (2021). https://doi.org/10.1134/S1070427221090159
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DOI: https://doi.org/10.1134/S1070427221090159