The characteristics of metal complexes before and after hydrotreating
As is known, some heavy petroleum oils contain large quantities of metals, mainly vanadium, which are usually associated with large molecules containing condensed polyaromatic rings. This causes considerable difficulty in hydrocatalytic upgrading of such heavy oils. For this reason, fundamental research on the characteristics of metal complexes in heavy oils has been carried out in view of hydrotreating. Several petroleum residues are the mixture of asphaltene micelles as particles containing resinic components, colloidally dispersed in maltenes (non-asphaltenes) as the medium. Asphaltenes contain heteroatom compounds, especially vanadium compounds, which play a significant role in the hydrotreating. Previous reports have indicated that the cracking of asphaltenes is very important for the hydroprocessing of heavy oils and the hydrodemetallization and hydrodesulfurization are closely related to the asphaltene cracking. Since the vanadium compounds mainly exist as the vanadyl porphyrins in asphaltenes, the structure of vanadyl porphyrins has been characterized by means of electron spin resonance (ESR). Also, the behavior of vanadyl compounds during the asphaltene cracking reaction and of the vanadium atoms during the hydrodemetallization were described. The characteristic changes in vanadyl porphyrins were further studied in both of the hydrotreating and thermal treating by using ESR.
- Research Organization:
- Chiyoda Chemical Engineering and Construction Co., Ltd., R and D Center, 3-13, Moriya-cho, Kanagawa-ku, Yokohama 221
- OSTI ID:
- 5598536
- Report Number(s):
- CONF-860425-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Vol. 31:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Two-step hydrodesulfurization of heavy hydrocarbon oil
Process for hydrotreating heavy hydrocarbon oil
Related Subjects
020400* -- Petroleum-- Processing
023000 -- Petroleum-- Properties & Composition
AROMATICS
ASPHALTENES
ASPHALTS
BITUMENS
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
COMPLEXES
CRACKING
DECOMPOSITION
DEMETALLIZATION
DESULFURIZATION
ELECTRON SPIN RESONANCE
ENERGY SOURCES
FOSSIL FUELS
FUELS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROGENATION
MAGNETIC RESONANCE
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM RESIDUES
PORPHYRINS
PYROLYSIS
RESONANCE
SEPARATION PROCESSES
STRUCTURAL CHEMICAL ANALYSIS
TAR
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPLEXES
VANADIUM COMPOUNDS
VISCOSITY