Mixing of sulfur between pyritic and organic phases during coal conversion processes: Annual final report, March 1, 1986-February 28, 1987
In preparation for using /sup 33/S NMR for characterization of organic sulfur types in coal, previously prepared substituted dibenzothiophene model compounds were converted to their corresponding sulfones and their sulfur-33 nmr recorded. The sulfur-33 NMR spectra of dibenzothiophene-5,5-dioxide (2), 2-(p-methylphenylsulfonyl) dibenzothiophene-5,5-dioxide (4), and 2-(methylsulfonyl) dibenzothiophene-5,5-dioxide (6) are reported. The chemical shifts were in the +2 to -21 ppM range. The line widths ranged 70 to 200 Hz. The changes in /sup 13/C chemical shift experienced by aromatic carbons upon oxidizing the sulfide to its sulfone were also studied and the data used to identify which sulfone was formed in multiple thioether-containing aromatics after partial oxidation. Continuing results on the use of the substituted dibenzothiophenes to monitor mixing of sulfur between pyritic and organic phases are also reported. Non-isothermal hydrodesulfurization of model organic sulfur compounds was carried out in a cola-like environment. The model sulfur compounds represented different types of carbon-sulfur bonds commonly encountered in coal. Similar experiments were carried out in the presence of troilite (iron sulfide) to investigate the possibility of sulfur migration from the organic compound to the iron sulfide. Next, iron pyrite was hydrodesulfurized in the presence of some organic molecules to see if sulfur could be incorporated into the organic molecules during the process. Results show that sulfur from organic compounds can be absorbed by troilite, and, similarly, sulfur from pyrite can form new carbon-sulfur bonds during hydrodesulfurization. Based on these observations, it is suggested that during coal conversion reactions it is possible to have intermigration of sulfur between the organic and the inorganic phases.
- Research Organization:
- Southern Illinois Univ., Carbondale (USA). Coal Extraction and Utilization Research Center
- DOE Contract Number:
- FC22-86PC91272
- OSTI ID:
- 6777061
- Report Number(s):
- DOE/PC/91272-T10; ON: DE87009873
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
NUCLEAR MAGNETIC RESONANCE
ORGANIC SULFUR COMPOUNDS
CHEMICAL REACTIONS
PYRITE
ACTIVATION ENERGY
CARBON 13
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL SHIFT
DESULFURIZATION
GAS CHROMATOGRAPHY
HYDROGENATION
MOESSBAUER EFFECT
PYRRHOTITE
STRUCTURAL MODELS
SULFONES
SULFUR 33
THERMAL GRAVIMETRIC ANALYSIS
THIOLS
THIONAPHTHENES
THIOPHENE
TROILITE
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
ENERGY
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
HETEROCYCLIC COMPOUNDS
IRON COMPOUNDS
IRON SULFIDES
ISOTOPES
KINETICS
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
MINERALS
NUCLEI
ORGANIC COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
RESONANCE
SEPARATION PROCESSES
STABLE ISOTOPES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SULFUR ISOTOPES
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
010600* - Coal
Lignite
& Peat- Properties & Composition