Abstract
Benzene proved to be a more effective eluent compared to chlorinated organic solvents traditionally used for chromatographic recovery of vanadyl petroporphyrins from the dimethylformamide (DMF) extract of asphaltenes on a column packed with mesoporous silica gel. Low eluting power of benzene can be compensated by moistening of the silica gel adsorbent. An increase in the silica gel moisture content from 0 to 7.7% does not lead to a decrease in the efficiency of the separation of vanadyl porphyrins from nonporphyrin components but leads to a tenfold decrease in the eluent consumption. A decrease in the eluent flow rate from 0.8 to 0.12 mL min–1 (per gram of the adsorbent) leads to a 1.5-fold increase in the yield of vanadyl porphyrins of required purity. An increase in the adsorbate : adsorbent weight ratio from 1 : 833 to 1 : 83 does not lead to a decrease in the efficiency of the vanadyl porphyrin recovery. Elution with benzene under optimum conditions (adsorbent moisture content, eluent flow rate, adsorbate : adsorbent ratio) allows the recovery of 3 times larger amount of petroleum vanadyl porphyrins from the DMF extract of asphaltenes than when using chloroform and dried silica gel under equal other conditions.
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ACKNOWLEDGMENTS
The authors are grateful to the Center for Shared Use Spectroscopic and Analytical Center, Kazan Scientific Center, Russian Academy of Sciences for the technical support of the study.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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Translated from Zhurnal Prikladnoi Khimii, No. 3, pp. 305–315, August, 2023 https://doi.org/10.31857/S004446182303009X
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Mironov, N.A., Tazeeva, E.G., Milordov, D.V. et al. Influence of the Moisture Content of Mesoporous Silica Gel on the Efficiency of the Chromatographic Recovery of Vanadyl Petroporphyrins with Benzene. Russ J Appl Chem 96, 332–341 (2023). https://doi.org/10.1134/S1070427223030096
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DOI: https://doi.org/10.1134/S1070427223030096