The fate of sulfur in mild gasification liquids
This investigation addresses the determination of sulfur distribution in mild gasification liquids produced from untreated coal and from modified in two ways to reduce sulfur in the products: (a) physical mixing with a sulfur scavenger (CaO), and (b) pretreatment with aqueous alkali followed by mixing with CaO. Coal pyrolysis in the presence of CaO has previously been investigated, (3,5) showing that CaO can be effective in reducing the sulfur content of the fuel gas, and possibly that of the product liquids. Pretreatment of coals with alkaline chemicals has also been studied,(6,7) showing reduced sulfur and other changes in the liquid products.(8) Data on sulfur distribution in the liquid products could be useful for understanding the chemistry of alkali pretreatment and CaO interaction with coal sulfur during pyrolysis. In this work, a pyrolysis-gas chromatography (Py-GC) technique that simulates mild gasification on a milligram scale was used in conjunction with a carbon-specific flame ionization detector (FID) and a sulfur-specific flame photometric detector (FPD) to determine the sulfur distribution in oils/tars from Illinois No. 6 coal. A low-resolution packed GC column was employed to resolve oils/tars by carbon number, with ranges selected to approximate distillation fractions which might be recovered from a commercial mild gasification process. Oils/tars up to C{sub 18} were also collected from the pyro-probe effluent into dichloromethane for off-line study using a high-resolution GC with atomic emission detector (GC/AED) and with GC-mass spectrometry (GC/MS) to measure specific sulfur compounds. 9 refs., 1 tab.
- Research Organization:
- Institute of Gas Technology, Chicago, IL (United States)
- OSTI ID:
- 6224871
- Report Number(s):
- CONF-910902-9; ON: TI92002499
- Country of Publication:
- United States
- Language:
- English
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ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
BITUMINOUS COAL
BLACK COAL
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMATOGRAPHY
COAL
COAL GASIFICATION
COAL LIQUIDS
COAL TAR
DECOMPOSITION
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GAS CHROMATOGRAPHY
GASIFICATION
LIQUIDS
MASS SPECTROSCOPY
MATERIALS
METALS
OILS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SEPARATION PROCESSES
SPECTROSCOPY
SULFUR CONTENT
TAR
THERMOCHEMICAL PROCESSES