Fractionations of nonporphyrin complexes of vanadium and nickel from Boscan crude oil
Samples containing V and Ni nonporphyrin complexes were isolated from Boscan crude oil from Venezuela. Chromatographic studies indicated that a broad molecular weight range of components existed so that silica packings having 300A average pore diameter were superior to those in the range 60 to 100A due to greater permeation. Solvents having widely different polarities and selectivities were needed for elution of nonporphyrins from 300A pore diameter silica derivatized with trimethylchlorosilane. Successive solvents eluted different percentages of the metals and of uv-visible absorbing components. Larger molecular-weight species, which contained the bulk of the metals, were eluted by chloroform, methylene chloride, and tetrahydrofuran. Results also suggested the existence of slow equilibria between high and low molecular weight species within a particular nonporphyrin fraction. When asphaltenes were precipitated from samples of crude oil by n-hexane, most of the V and Ni was found in that higher molecular weight fraction. Results of further fractionating of the soluble (maltene) fraction using neutral alumina and of the path of V and Ni in the separation of asphaltenes into porphyrin and nonporphyrin fractions are reported. Finally, it was found that a procedure utilizing sulfuryl chloride for nonporphyrin demetallation was superior to a procedure employing methanesulfonic acid.
- Research Organization:
- Univ. of Georgia, Athens
- DOE Contract Number:
- AS09-76ER00854
- OSTI ID:
- 6174934
- Journal Information:
- Sep. Sci.; (United States), Journal Name: Sep. Sci.; (United States) Vol. 18:7; ISSN SESCA
- Country of Publication:
- United States
- Language:
- English
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Fractionations of nonporphyrin complexes of vanadium and nickel from Boscan crude oil
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
CHROMATOGRAPHY
DATA
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
INFORMATION
LIQUID COLUMN CHROMATOGRAPHY
METALS
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PETROLEUM
SEPARATION PROCESSES
SPECTRA
TRANSITION ELEMENTS
ULTRAVIOLET SPECTRA
VANADIUM
VISIBLE SPECTRA