Method for desulfurization of coal

Patent · Wed Dec 31 23:00:00 EST 1986

OSTI ID:866301

Kelland, David R ^[1]

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1. Lexington, MA

A process and apparatus 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-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.

• Research Organization: Massachusetts Institute of Technology (Cambridge, MA)
• DOE Contract Number: FG02-84ER13244
• Assignee: Massachusetts Institute of Technology (Cambridge, MA)
• Patent Number(s): US 4678478
• OSTI ID: 866301
• Country of Publication: United States
• Language: English

Related Subjects

/44/201/209/
1-x
added
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ash-forming
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catalyst
chemical
chemical agent
chemical agents
coal
compound
contents
convenient
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desulfurizing
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fes
flocculant
flowing
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form
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heating
inorganic
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inorganic sulfur
iron
iron sulfide
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left
liquid
magnetic
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method
minerals
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organic
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organic iron
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predominantly
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process
pyrite
pyrrhotite
react
reduce
release
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removes
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separation
separation technique
separation techniques
step
sulfides
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troilite