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RECORD NUMBER: 34 OF 270

OLS Field Name OLS Field Data
Main Title Chemical Removal of Nitrogen and Organic Sulfur from Coal.
Author Meyer, R. A. ; Lan, J. S. ; Flega, C. A. ;
CORP Author TRW Systems Group, Redondo beach, Calif.
Year Published 1971
Report Number 17270-6007-RO00; EPA-EHSD-71-7; 0845;
Stock Number PB-204 863
Additional Subjects ( Coal preparation ; Solvent extraction) ; ( Desulfurization ; Coal) ; Nitrogen organic compounds ; Sulfur organic compounds ; Organic acids ; Nitrobenzenes ; Air pollution control ; Denitrification
Holdings
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Status
NTIS  PB-204 863 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 62p
Abstract
Techniques for extracting organic sulfur and nitrogen compounds from coal without significantly altering the remainder of the coal matrix were tested in the laboratory. The concept for chemical removal of organic sulfur and nitrogen is feasible. Weak organic acids remove 45-80% of the organic sulfur from the coals investigated depending on process conditions and the specific coal leached. Nitrobenzene appears to be the most efficient solvent for the removal of organic sulfur. Aqueous caustic removes small amounts of organic sulfur from some coals, but none from others. Particle size (-200 mesh to 1/2-inch) has no discernable effect on the removal of organic sulfur by nitrobenzene. The leaching solvent, nitrobenzene, may be recycled at least three times to remove organic sulfur from coal. Weak organic acids and strong inorganic acids appear to remove nitrogen from the coals tested in this program according to the Dumas analytical method, but no nitrogen is removed according to the Kjeldahl method. Weak organic acids for removal of organic sulfur from coal may be readily adapted to engineering process schemes. The cost of the process for removal of organic sulfur from coal is highly dependent on the degree of solvent loss, and the ability to recycle solvent and allow high sulfur compound buildup. The process cost for removal or organic sulfur is approximately $1.00-$1.50/ton of coal. (Author)