Preliminary examination of coal liquefaction products. [12 refs]
Coal liquids have been separated by solvent fractionation into three crude fractions: pentane-soluble; pentane-insoluble and benzene-soluble (crude asphaltene); and benzene-insoluble. The pentane-soluble fraction has been further separated into a liquid propane-soluble fraction (gas oil), and a liquid propane-insoluble fraction (resin). The benzene-insoluble fraction has been further separated into a carbon disulfide-soluble fraction (carbene), and a carbon disulfide-insoluble fraction (carboid). The great majority of these materials have been characterized by elemental and metal analyses, molecular weight, particle size, and color intensity determination, and NMR, IR, and x-ray diffraction analyses. The crude asphaltene fractions have been further separated into major fractions by solvent elution chromatography. The two major asphaltene fractions obtained from crude asphaltenes by elution from silica gel with benzene and diethyl ether differ markedly in nitrogen content indicating that species with basic nitrogens are being preferentially absorbed on silica gel. This suggests that silica gel chromatography may provide a mild, chlorine-free procedure for separating asphaltenes into acidic and basic components.
- Research Organization:
- Univ. of Southern California, Los Angeles
- OSTI ID:
- 7146879
- Journal Information:
- Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Vol. 21:5; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Chemistry and structure of coal-derived asphaltenes: Phase I. Quarterly progress report, April--June 1976. [Fractionation into 5 fractions]
Chemistry and structure of coal-derived asphaltenes, Phase II. Quarterly progress report, January--March 1977. [15 refs]
Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ADSORBENTS
ALKANES
AROMATICS
ASPHALTENES
ASPHALTS
BENZENE
BITUMENS
CARBON COMPOUNDS
CARBON SULFIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
COAL LIQUEFACTION
COAL LIQUIDS
COHERENT SCATTERING
COLOR
DIAGRAMS
DIFFRACTION
ETHERS
ETHYL ETHER
EXTRACTION
FLOWSHEETS
FRACTIONATION
HYDROCARBONS
INFRARED SPECTRA
LIQUEFACTION
MOLECULAR WEIGHT
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANOLEPTIC PROPERTIES
OTHER ORGANIC COMPOUNDS
PARTICLE SIZE
PENTANE
PHYSICAL PROPERTIES
SCATTERING
SEPARATION PROCESSES
SILICA GEL
SIZE
SOLUBILITY
SOLVENT EXTRACTION
SPECTRA
SULFIDES
SULFUR COMPOUNDS
TAR
X-RAY DIFFRACTION