Metalloporphyrins and trace metals as geochemical indicators for petroleum heavy ends
Of the various trace metals in petroleum, vanadium and nickel are the most abundant. Heavy ends of 3 oil samples from different fields were used. They were each fractionated into their maltene and asphaltene components on the basis of their hexane solubility. The porphyrins were isolated from the oil fractions by liquid chromatography of ethanolic extracts on activated silica gel. The fractions were eluted with hexane-benzene and chloroform benzene and the visible spectra and more reliable absorption spectra were measured. The total vanadium and nickel content of the maltenes and asphaltenes was measured in methyl isobutyl ketone-xylene solutions at 318.5 and 235 nm resonance lines by absorption spectroscopy. The result on the total trace metal content indicates that the vanadium/nickel index of 3.52 of the asphaltenes is reliable and comparable with the crude oil. The higher accuracy of the isolated measurements of the metal porphyrin content produced more acceptable proportions of porphyrinic metals, and is in support of the measured vanadium/nickel index. 3 tables.
- Research Organization:
- Alexandria Univ., Egypt
- OSTI ID:
- 6168766
- Report Number(s):
- CONF-810813-(Vol.2)
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Vol. 26:4; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
023000 -- Petroleum-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
400105 -- Separation Procedures
58 GEOSCIENCES
580400* -- Geochemistry-- (-1989)
ABSORPTION SPECTRA
ADSORBENTS
ALCOHOLS
ALKANES
AROMATICS
ASPHALTENES
ASPHALTS
BENZENE
BITUMENS
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CHEMISTRY
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
COMPARATIVE EVALUATIONS
COMPLEXES
DATA
DISPERSIONS
DISTILLATES
DISTILLATION
ELEMENTS
ENERGY SOURCES
ETHANOL
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GEOCHEMISTRY
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HEXANE
HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
KETONES
METALS
METHYL ISOBUTYL KETONE
MIXTURES
NICKEL
NICKEL COMPLEXES
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SOLVENTS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
PORPHYRINS
QUANTITATIVE CHEMICAL ANALYSIS
SAMPLE PREPARATION
SEPARATION PROCESSES
SILICA GEL
SOLVENTS
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
TAR
TRACE AMOUNTS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
VANADIUM
VANADIUM COMPLEXES
VISCOSITY
VISIBLE SPECTRA
XYLENES