Solvent effects in the molecular weights of petroleum asphaltenes

Conference · Tue Sep 01 04:00:00 EDT 1981 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:6326975

Speight, J G

Asphaltenes were isolated from Athabasca bitumen by the addition of n-pentane (40%) to a 1% solutumen in benzene (1 g/cc). The asphaltenes were further refined by the repetition of the precipitation procedure. The raw asphaltenes were also continuously extracted (Soxhlet) by a variety of a solvents until the extracts were colorless (ca 24 h). Solvents included carbon tetrachloride, tetrahydrofuran, and pyridine. Molecular weights were determined at various temperatures by vapor pressure osmometry. The tendency of asphaltenes to undergo/dissociation depending upon the nature of the solvent also appears to be true for the series of higher molecular weight fractions. Notice should be taken that, although the results with these particular asphaltenes and with asphaltenes available from other Alberta crude oils suggest that molecular weight varies with the dielectric constant of the solvent, factors not yet investigated may also be responsible for this phenomenon. 1 figure, 1 table.

• Research Organization: Exxon Research and Engineering Co., Linden, NJ
• OSTI ID: 6326975
• Report Number(s): CONF-810813-(Vol.2)
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 26:4
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
023000* -- Petroleum-- Properties & Composition
04 OIL SHALES AND TAR SANDS
040500 -- Oil Shales & Tar Sands-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
ASPHALTENES
ASPHALTS
AZINES
BITUMENS
CARBON TETRACHLORIDE
CHLORINATED ALIPHATIC HYDROCARBONS
DATA
EXPERIMENTAL DATA
EXTRACTION
FURANS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HIGH TEMPERATURE
INFORMATION
MEASURING METHODS
MOLECULAR WEIGHT
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PRECIPITATION
PYRIDINE
PYRIDINES
SEPARATION PROCESSES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
TAR
TEMPERATURE DEPENDENCE
TETRAHYDROFURAN
THERMODYNAMIC PROPERTIES
VAPOR PRESSURE