Supercritical fluid fractionation and detailed characterization of the sulfur heterocycles in a catalytically cracked petroleum vacuum residue
The sulfur heterocycles in a catalytically cracked vacuum residue were isolated by use of a newly developed ligand exchange chromatographic procedure, and they were then fractionated according to the number of aromatic rings by using a supercritical fluid fractionation system with supercritical CO/sub 2/ as the fractionation solvent. Compounds in each fraction were identified by capillary column gas chromatography and gas chromatography/mass spectrometry. Characteristic mass spectral fragmentation patterns were used to confirm identifications, particularly for the alkyl-substituted compounds. The sulfur heterocycles in this sample were annellated on both sides of the thiophene ring and were highly alkylated; the most abundant compounds contained alkyl chains with three carbon atoms. Several four-ring compounds containing two sulfur heteroatoms were also detected. This example illustrates the effectiveness of supercritical fluid fractionation according to the number of aromatic rings for highly alkylated samples.
- Research Organization:
- Brigham Young Univ., Provo, UT
- DOE Contract Number:
- AC02-79EV10237
- OSTI ID:
- 5301250
- Journal Information:
- Anal. Chem.; (United States), Vol. 58:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON DIOXIDE
SOLVENT PROPERTIES
HETEROCYCLIC COMPOUNDS
FRACTIONATION
GAS CHROMATOGRAPHY
SUPERCRITICAL FLUID CHROMATOGRAPHY
PETROLEUM RESIDUES
QUALITATIVE CHEMICAL ANALYSIS
SULFUR COMPOUNDS
EXPERIMENTAL DATA
LIGANDS
MASS SPECTROSCOPY
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
ENERGY SOURCES
FOSSIL FUELS
FUELS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
SEPARATION PROCESSES
SPECTROSCOPY
023000* - Petroleum- Properties & Composition
400105 - Separation Procedures
400104 - Spectral Procedures- (-1987)