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Mild supercritical-gas extraction from low-rank coals: separation, spectroscopy, and composition of alkane products

Journal Article · · Sep. Sci. Technol.; (United States)
 [1]; ;
  1. Univ. of Leeds, England
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Alkane fractions of supercritical-gas (SRG) extracts of Turkish lignite were separated by silica-gel chromatography followed by 5 A molecular-sieve adsorption, yielding the branched cyclic alkane subfractions. Progress was monitored by gas-liquid chromatography and /sup 1/HNMR spectroscopy. Saturated aliphatic hydrocarbons identified by gas chromatography/mass spectrometry from one lignite include normals n-C/sub 13/ to n-C/sub 33/ inclusive, acrylic isoprenoids C/sub 18/, C/sub 19/, and C/sub 20/, and two C/sub 31/ pentacyclic (triterpane) and one (C/sub 15/) dicyclic cycloalkanes. The distributions of n-alkanes depend more on extraction conditions than do the distributions of isoprenoids and cycloalkanes. overall, batchwise SCG extraction of low-rank coals with toluene or tetrahydrofuran at about 350/sup 0/C appears to cause little thermolysis and can yield relatively large quantities of paraffinic hydrocarbons, representative of the original coals, and useful as geochemical markers.

OSTI ID:
6179949
Journal Information:
Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 17:1; ISSN SSTED
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
ADSORBENTS
ADSORPTION
ALKANES
ALKENES
AROMATICS
BROWN COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTION YIELD
CHROMATOGRAPHY
COAL
COAL LIQUEFACTION
CYCLOALKANES
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FUELS
FURANS
GAS CHROMATOGRAPHY
HETEROCYCLIC COMPOUNDS
HIGH PRESSURE
HIGH TEMPERATURE
HYDROCARBONS
LIGNITE
LIQUEFACTION
MAGNETIC RESONANCE
MASS SPECTRA
MATERIALS
MOLECULAR SIEVES
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
RESONANCE
SEPARATION PROCESSES
SILICA GEL
SORPTION
SPECTRA
SUPERCRITICAL GAS EXTRACTION
TEMPERATURE DEPENDENCE
TETRAHYDROFURAN
THERMOCHEMICAL PROCESSES
TOLUENE
YIELDS