Method for desulfurization of coal

Patent · Tue Jul 07 00:00:00 EDT 1987

OSTI ID:7260559

Kelland, D R

A process and apparatus are disclosed for desulfurizing coal which removes sulfur in the inorganic and organic form by preferentially heating the inorganic iron sulfides in coal in a flowing gas to convert some of the inorganic iron sulfides from a pyrite form FeS[sub 2] to a troilite FeS form or a pyrrhotite form Fe[sub 1[minus]x]S and release some of the sulfur as a gaseous compound. The troilite and pyrrhotite forms are convenient catalyst for removing the organic sulfur in the next step, which is to react the coal with chemical agents such as alcohol, thus removing the organic sulfur as a liquid or a gas such as H[sub 2]S. The remaining inorganic sulfur is left in the predominantly higher magnetic form of pyrrhotite and is then removed by magnetic separation techniques. Optionally, an organic flocculant may be added after the organic sulfur has been removed and before magnetic separation. The flocculant attaches non-pyrite minerals with the pyrrhotite for removal by magnetic separation to reduce the ash-forming contents. 2 figs.

• DOE Contract Number: FG02-84ER13244
• Assignee: Massachusetts Inst. of Tech., Cambridge, MA (United States)
• Patent Number(s): US 4678478; A
• Application Number: PPN: US 6-851924
• OSTI ID: 7260559
• Resource Relation: Patent File Date: 14 Apr 1986
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
DEASHING
DESULFURIZATION
CATALYSTS
COAL PREPARATION
IRON SULFIDES
MAGNETIC SEPARATORS
ORGANIC SULFUR COMPOUNDS
PHASE TRANSFORMATIONS
REMOVAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CONCENTRATORS
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON COMPOUNDS
MATERIALS
ORGANIC COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
010300* - Coal
Lignite
& Peat- Preparation- (1987-)
010402 - Coal
Lignite
& Peat- Purification & Upgrading