GC/MS characterization of condensable tars in the output stream of a stirred fixed-bed gasifier
The output stream of the stirred fixed-bed gasifier at the Morgantown Energy Technology Center was sampled for total entrained material. A major portion of the entrained material, in addition to particles, is condensable tar that is subsequently removed from the process gas by wet scrubbing. Characterization of the entrained materials, specifically the tar, is important to establish contaminant levels and to evaluate performance of downstream cleanup units. Samples of tars were collected from the process unit in a combined ice, dry ice, and liquid nitrogen sampler and stored in a refrigerator. The tar samples were then separated into asphaltene, neutral oil, tar acid, and base fractions by solvent extraction using toluene, pentane, sulfuric acid, and potassium hydroxide extraction. Characterization of the fractions obtained from these tars include IR, UV, GC, and GC/MS analysis. The mass spectrometer analysis of the various isolates shows that many individual peaks in the gas chromatograph are in fact mixtures that can be readily identified by the mass spectrometer. It was found that many of the species identified in these fractions were members of aromatic homologous series consisting of parent, mono, di, and tri substituted compounds. Compound identification was made by comparison of the data system library and standard reference spectra. This paper will discuss the instrumental approach and limitation of the GC/MS and the results of the characterization studies of entrained hydrocarbons collected from the gasifier stream.
- Research Organization:
- Department of Energy, Morgantown, WV (USA). Morgantown Energy Technology Center
- OSTI ID:
- 5386209
- Report Number(s):
- DOE/METC/TPR-82/2; ON: DE82011723
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIPHENYL
GAS CHROMATOGRAPHY
MASS SPECTROSCOPY
CARBAZOLES
COAL TAR
FRACTIONATION
SOLVENT EXTRACTION
STRUCTURAL CHEMICAL ANALYSIS
CONDENSED AROMATICS
CRESOLS
CYCLOALKANES
FURANS
NAPHTHALENE
PHENOLS
PYROCATECHOL
QUINOLINES
TETRALIN
ASPHALTENES
CHEMICAL REACTORS
COAL GASIFICATION
EXPERIMENTAL DATA
INFRARED SPECTRA
OILS
PACKED BED
PENTANE
POTASSIUM HYDROXIDES
SULFURIC ACID
TOLUENE
ULTRAVIOLET SPECTRA
ALKALI METAL COMPOUNDS
ALKANES
AROMATICS
ASPHALTS
AZINES
AZOLES
BITUMENS
CHROMATOGRAPHY
DATA
DEVELOPERS
EXTRACTION
GASIFICATION
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INFORMATION
INORGANIC ACIDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLYPHENOLS
POTASSIUM COMPOUNDS
PYRIDINES
SEPARATION PROCESSES
SPECTRA
SPECTROSCOPY
TAR
THERMOCHEMICAL PROCESSES
010404* - Coal
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& Peat- Gasification
010600 - Coal
Lignite
& Peat- Properties & Composition