Use of ferric sulfate: acid media for the desulfurization of model compounds of coal. [Dibenzothiophene, diphenyl sulfide, di-n-butyl sulfide]
The objective of this work has been to investigate the ability of ferric sulfate-acid leach systems to oxidize the sulfur in model compounds of coal. Ferric iron-acid leach systems have been shown to be quite effective at removal of inorganic sulfur in coal. In this study, the oxidative effect of ferric iron in acid-leach systems was studied using dibenzothiophene, diphenyl sulfide, and di-n-butyl sulfide as models of organic sulfur groups in coal. Nitrogen and oxygen, as well as various transition metal catalysts and oxidants, were utilized in this investigation. Dibenzothiophene was found to be quite refractory to oxidation, except in the case where metavanadate was added, where it appears that 40% oxidation to sulfone could have occurred per hour at 150/sup 0/C and mild oxygen pressure. Diphenyl sulfide was selectively oxidized to sulfoxide and sulfone in an iron and oxygen system. Approximately 15% conversion to sulfone occurred per hour under these conditions. Some of the di-n-butyl sulfide was cracked to 1-butene and 1-butanethiol under similar conditions. Zinc chloride and ferric iron were used at 200/sup 0/C in an attempt to desulfonate dibenzothiophene sulfone, diphenyl sulfone, and di-n-butyl sulfone. Di-n-butyl sulfone was completely desulfurized on one hour and fragmented to oxidized parafins, while dibenzothiophene sulfone and diphenyl sulfone were unaffected. These results suggest that an iron-acid leach process could only selectively oxidize aryl sulfides under mild conditions, representing only 20% of the organic sulfur in coal (8% of the total sulfur). Removal through desulfonation once selective sulfur oxidation had occurred was only demonstrated for alkyl sulfones, with severe oxidation of the fragmented paraffins also occurring in one hour.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); California Univ., Berkeley (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5947034
- Report Number(s):
- LBL-11992; ON: DE82001021
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPPER SULFATES
CATALYTIC EFFECTS
IRON CHLORIDES
IRON SULFATES
CHEMICAL REACTIONS
MANGANESE SULFATES
ORGANIC SULFUR COMPOUNDS
OXIDATION
SULFONES
DESULFURIZATION
ZINC CHLORIDES
ZINC SULFATES
CATIONS
COAL
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
INFRARED SPECTRA
MASS SPECTROSCOPY
NITROGEN
OXYGEN
STRUCTURAL MODELS
SULFOXIDES
SULFURIC ACID
CARBONACEOUS MATERIALS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CHROMATOGRAPHY
COPPER COMPOUNDS
DATA
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
IONS
IRON COMPOUNDS
MANGANESE COMPOUNDS
MATERIALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SPECTRA
SPECTROSCOPY
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC HALIDES
010402* - Coal
Lignite
& Peat- Purification & Upgrading
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)