Method for desulfurization of coal

Title: Method for desulfurization of coal

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Abstract

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.

Inventors:: Kelland, D.R.

Issue Date:: 1987-07-07

OSTI Identifier:: 7260559

Patent Number(s):: 4678478 A

Application Number:: PPN: US 6-851924

Assignee:: Massachusetts Inst. of Tech., Cambridge, MA (United States) PTO; EDB-94-121090

DOE Contract Number:: FG02-84ER13244

Resource Type:: Patent

Resource Relation:: Patent File Date: 14 Apr 1986

Country of Publication:: United States

Language:: English

Subject:: 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

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                    Kelland, D.R. Method for desulfurization of coal.  United States: N. p., 1987. 
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                    Kelland, D.R. Method for desulfurization of coal.  United States.

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                    Kelland, D.R. Tue .  
        "Method for desulfurization of coal".  United States.

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@article{osti_7260559,

  title        = {Method for desulfurization of coal},

  author       = {Kelland, D.R.},

  abstractNote = {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.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1987},

  month        = {7}

}

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