Asphaltene cracking in catalytic hydrotreating of heavy oils. 2. study of changes in asphaltene structure during catalytic hydroprocessing

Journal Article · Fri Apr 01 00:00:00 EST 1983 · Ind. Eng. Chem. Process Des. Dev.; (United States)

OSTI ID:6021506

Sachio, A; Chisato, T; Shinichi, N; Yoshimi, S

Characteristics in catalytic conversion of asphaltenes in petroleum heavy residues were studied in the hydrotreating process. A Boscan crude, an Athabasca bitumen, and a Khafji vacuum residue were tested as typical feedstocks. Various analyses were made to obtain the properties of asphaltenes before and after the reaction, e.g., changes of heteroatoms such as sulfur and metals, and decreases of molecular weight. The characteristic changes of asphaltene molecules were also investigated by electron spin resonance (ESR) and X-ray analyses. The association and coordination of vanadyl in asphaltenes were studied by the temperature dependence on the ESR spectra, and the sizes of the stacked crystallites and the aggregated asphaltene micelles were measured with X-ray diffraction and small-angle scattering. In the asphaltene cracking mechanism, it was clarified that the main reactions were the destruction of asphaltene micelles caused by vanadium removal and the depolymerization of asphaltene molecules by removal of heteroatoms such as sulfur.

• Research Organization: Chiyoda Chemical Engineering and Construction Co., Ltd., 3-13, Moriya-cho, Kanagawa-ku, Yokohama 221
• OSTI ID: 6021506
• Journal Information: Ind. Eng. Chem. Process Des. Dev.; (United States), Vol. 22:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
ASPHALTENES
CATALYTIC CRACKING
PETROLEUM RESIDUES
HYDROCRACKING
BITUMENS
DEPOLYMERIZATION
ELECTRON SPIN RESONANCE
MICELLAR SYSTEMS
MOLECULAR WEIGHT
OILS
SULFUR
TEMPERATURE DEPENDENCE
VANADIUM
X-RAY DIFFRACTION
ASPHALTS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRACKING
DECOMPOSITION
DIFFRACTION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
MAGNETIC RESONANCE
METALS
NONMETALS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PYROLYSIS
RESONANCE
SCATTERING
TAR
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
020400* - Petroleum- Processing