Highly effective liquid chromatography of petroleum vanadylporphyrins

Mozzhelina, T.K.; Serebrennikova, O. V.; Beiko, O.A.; Krasovskaya, L.I.

doi:10.1016/s0031-6458(85)80010-1

Cited by 2 publications

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“…A number of methods have been attempted to isolate the metalloporphyrin compounds, including solubility class separation, Soxhlet extraction, , vacuum sublimation, and chromatographic techniques, such as high-performance liquid chromatography (HPLC) − and thin-layer chromatography. , During the process of isolation, porphyrins and non-porphyrins are separated from each other. Therefore, it should be possible to examine the compounds without interference from each other.…”

Section: Introductionmentioning

confidence: 99%

Separation and Characterization of Vanadyl Porphyrins in Venezuela Orinoco Heavy Crude Oil

et al. 2013

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Venezuela Orinoco heavy crude oil was sequentially separated into several subfractions to determine the contents and types of vanadyl porphyrins contained in the products. Vanadium contents in each subfraction were detected using an atomic absorption spectrometer (AAS) combined with the characterization of vanadyl porphyrins by ultraviolet–visible (UV–vis) spectroscopy and positive-ion electrospray ionization (ESI) Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS). Six types of petroleum vanadyl porphyrins, which have been identified previously, were well-characterized with the detailed fractionation. Three new series of vanadyl porphyrins corresponding to molecules of C n H m N4VO2, C n H m N4VO3, and C n H m N4VO4, respectively, were identified in addition to the six known types of vanadyl porphyrins.

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Section: Introductionmentioning

confidence: 99%

Separation and Characterization of Vanadyl Porphyrins in Venezuela Orinoco Heavy Crude Oil

et al. 2013

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“…Many successive separation procedures can purify petroporphyrins significantly. These separation processes have been used successfully by many, but despite fairly abundant literature on the topic, petroporphyrin extraction and enrichment still present many challenges, including similarity of petroporphyrin solubility to other hydrocarbons, such as asphaltenes or resins, difficulty of detection and quantification of petroporphyrins, and scarcity of petroporphyrin compounds in the starting material. ,,− …”

Section: Introductionmentioning

confidence: 99%

Ultrahigh-Purity Vanadyl Petroporphyrins

et al. 2018

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Petroporphyrins contribute to many of the challenges encountered when producing, transporting, and refining heavy crude oil and bitumen. They are the source of heavy metals that poison catalysts and may facilitate the aggregation, deposition, and emulsion formation exhibited by asphaltenes. Here, they are extracted and enriched to ultrahigh purities from several sources: an Athabasca bitumen, a Canadian northern tier crude oil, and a North American heavy crude oil. Our motivation is to produce usable quantities that can be characterized and used in model studies to understand the molecular structure of asphaltenes and to probe asphaltene−petroporphyrin intermolecular interactions, in the bulk and at interfaces. Extraction is performed in a Soxhlet apparatus. The porphyrin-rich extract is then further purified using extrography (on silicapacked columns) and chromatography (on alumina-packed columns). The process yields purified petroporphyrins in unprecedented quantities (>100 mg). These purified petroporphyrins can be further refined to ultrahigh purities (>85% petroporphyrin by weight) using temperature and centrifugation to fractionate them into more and less soluble fractions. Petroporphyrins are characterized by ultraviolet−visible spectroscopy, X-ray fluorescence spectroscopy, and mass spectrometry (time of flight and Fourier transform ion cyclotron resonance). The majority of the petroporphyrins are simple etioporphyrin (407 nm Soret band) or deoxophylloerythroetioporphyrin (410 nm Soret band) types, but some are more functionalized compounds with highly broadened and shifted Soret bands.

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Highly effective liquid chromatography of petroleum vanadylporphyrins

Cited by 2 publications

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Separation and Characterization of Vanadyl Porphyrins in Venezuela Orinoco Heavy Crude Oil

Separation and Characterization of Vanadyl Porphyrins in Venezuela Orinoco Heavy Crude Oil

Ultrahigh-Purity Vanadyl Petroporphyrins

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