Molecular characterization and fingerprinting of vanadyl porphyrin and non-porphyrin compounds in heavy crude petroleums using HPLC-GFAA analysis
Element-specific high performance liquid chromatography-graphite furnace atomic absorption (HPLC-GFAA) analysis was used to classify vanadyl porphyrin and nonporphyrin compounds present in Boscan, Cerro Negro, Wilmington, and Prudhoe Bay heavy crude oils, containing 1100, 550, 49, and 19 ppM V. The crude oils and pyridine extraction products have been analyzed using the HPLC-GFAA technique with steric exclusion chromatography (SEC) and polar amino-cyano (PAC) columns to yield molecular weight and polarity distributions. 50% of the V present, in the form of low molecular weight vanadyl compounds, is extracted, primarily from the asphaltene fraction of each oil. HPLC-GFAA reveal two classes of extracted vanadyl nonporphyrin compounds. One class, present in Cerro Negro, Wilmington, and Prudhoe Bay pyrdine extract, consists of relatively nonpolar compound(s) with maximum uv-Vis absorbance at 300 nm. The other class, present in Boscan and Cerro Negro crude oils, consists of a more polar nonporphyrin compound(s) with maximum absorbance of 265 nm. The two Venezuelan, high sulfur crude oils contain proportionally greater percentages of vanadyl porphyrin compounds, while the two North American, low sulfur crude oils contain predominantly vanadyl nonporphyrin and nickel porphyrin compounds. A correlation relating V concentration and sulfur and asphaltene content has been observed, while correlations involving V content and depth of burial or age of deposit were not apparent. 21 figures, 5 tables.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA); California Univ., Berkeley (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6603983
- Report Number(s):
- LBL-15397; ON: DE83006964
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PETROLEUM
CHEMICAL ANALYSIS
VANADIUM COMPOUNDS
ABSORPTION SPECTROSCOPY
ASPHALTENES
CHROMATOGRAPHY
CLASSIFICATION
CORRELATIONS
ORGANOMETALLIC COMPOUNDS
PORPHYRINS
STRUCTURAL CHEMICAL ANALYSIS
SULFUR CONTENT
ASPHALTS
BITUMENS
CARBOXYLIC ACIDS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
SEPARATION PROCESSES
SPECTROSCOPY
TAR
TRANSITION ELEMENT COMPOUNDS
023000* - Petroleum- Properties & Composition