Thermal stability of asphaltenes

Conference · Sat Sep 01 04:00:00 EDT 1979 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:5749253

Hernandez, J O; Choren, E

The usual high content of V and Ni in heavy crude oils and the importance of the world reserves of this type of oils have motivated a considerable amount of work directed toward the elucidation of the chemical behavior of the organometallic compounds during the refining processes. Asphaltenes and porphyrins have also received a considerable amount of study because of their importance in the metal content of the oils and their importance in the study of the geological history of crudes. This work presents the results of the application of thermal analysis techniques to asphaltenes from Venezuelan oils, with the purpose of establishing their contribution to the volatile and residual parts of the organometallic compounds. The state of free asphaltenes is quite different than when they are dispersed in the crude because in the free state, they are stripped of the asphaltic resins that confer stability to their micellar suspension in the oil. The results show that the content of asphaltenes in the crude oils has no relation to API gravity. Nevertheless, those asphaltenes belonging to the heavier oils have a smaller C/H ratio independent of the field zone. Between 35 and 60% of vanadium content in crude is asphaltenic vanadium. Three samples of asphaltenes were heated, using the conditions of TGA described, up to 550/sup 0/C, and vanadium content was determined for the residue. The loss of vanadium from the different samples varied considerably, suggesting that the thermal stability of the vanadium complexes, was different.

• Research Organization: Universidad del Zulia, Maracaibo, Venezuela
• OSTI ID: 5749253
• Report Number(s): CONF-790917-(Vol.24)(No.4)
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 24:4
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
023000* -- Petroleum-- Properties & Composition
ASPHALTENES
ASPHALTS
BITUMENS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PETROLEUM
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
STABILITY
TAR
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VISCOSITY