Determination of nitrogen and oxygen functional groups in coal-derived asphaltenes
Coal-derived asphaltenes and their derivatives, isolated from five demonstration coal liquefaction processes (PAMCO SRC, Catalytic Inc. SRC, HRI H-Coal, Synthoil, and FMC-COED) were analyzed for hydroxyl content by silylation followed by proton NMR analysis. Nonbasic pyrrolic nitrogen content was determined for these asphaltenes by elemental analysis after they were separated by solvent elution chromatography, and treated further by methylation with methyl iodide to remove residual basic asphaltenes. Nonhydroxylic ether oxygen, and basic pyridine-like nitrogen content were calculated by difference from total oxygen and nitrogen obtained from elemental analysis. Infrared absorptivity values were determined from the OH and NH absorption bands of these asphaltenes, and found to give linear correlations with the weight percentages of OH, and pyrrolic nitrogen: absorptivity/sub OH/ = 0.066 +- 0.002 wt % OH (L/g-cm); absorptivity/sub NH/ = 0.052 +- 0.006 wt % pyrrolic nitrogen (L/g-cm). 1 figure, 4 tables.
- Research Organization:
- Univ. of Southern California, Los Angeles
- OSTI ID:
- 6131669
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 51:4; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010405 -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
010600* -- Coal
Lignite
& Peat-- Properties & Composition
AMIDES
AMINES
AROMATICS
ASPHALTENES
ASPHALTS
AZOLES
BENZENE
BITUMENS
CHEMICAL ANALYSIS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL LIQUEFACTION
DATA
DATA FORMS
DISSOLUTION
ETHERS
ETHYL ETHER
EXPERIMENTAL DATA
FURANS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
INFRARED SPECTRA
IODINATED ALIPHATIC HYDROCARBONS
ISOLATED VALUES
LEACHING
LIQUEFACTION
MAGNETIC RESONANCE
METHYL IODIDE
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SOLVENTS
OTHER ORGANIC COMPOUNDS
PHENOLS
PYRROLES
QUANTITATIVE CHEMICAL ANALYSIS
RESONANCE
SEPARATION PROCESSES
SILICON COMPOUNDS
SOLVENTS
SPECTRA
STANDARDS
STRUCTURAL CHEMICAL ANALYSIS
TAR
THERMOCHEMICAL PROCESSES
YIELDS