Regeneration of sulfated metal oxides and carbonates

Patent · Tue Mar 28 04:00:00 EST 1978

OSTI ID:863043

Hubble, Bill R ^[1]; Siegel, Stanley ^[2]; Cunningham, Paul T ^[3]

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1. Plainfield, IL
2. Downers Grove, IL
3. Naperville, IL

Alkali metal or alkaline earth metal carbonates such as calcium carbonate and magnesium carbonate found in dolomite or limestone are employed for removal of sulfur dioxide from combustion exhaust gases. The sulfated carbonates are regenerated to oxides through use of a solid-solid reaction, particularly calcium sulfide with calcium sulfate to form calcium oxide and sulfur dioxide gas. The regeneration is performed by contacting the sulfated material with a reductant gas such as hydrogen within an inert diluent to produce calcium sulfide in mixture with the sulfate under process conditions selected to permit the sulfide-sulfate, solid-state reaction to occur.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4081522
• OSTI ID: 863043
• Country of Publication: United States
• Language: English

Related Subjects

/423/
alkali
alkali metal
alkaline
alkaline earth
calcium
calcium carbonate
calcium oxide
calcium sulfate
calcium sulfide
carbonate
carbonates
combustion
combustion exhaust
conditions
contacting
diluent
dioxide
dioxide gas
dolomite
earth
earth metal
employed
exhaust
exhaust gas
exhaust gases
form
form calcium
found
gas
gases
hydrogen
inert
limestone
magnesium
magnesium carbonate
material
metal
metal carbon
metal carbonate
metal carbonates
metal oxide
metal oxides
mixture
occur
oxide
oxide gas
oxides
particularly
particularly calcium
performed
permit
process
process conditions
produce
produce calcium
reaction
reductant
regenerated
regeneration
removal
selected
solid reaction
solid-solid
solid-state
sulfate
sulfated
sulfide
sulfide-sulfate
sulfur
sulfur dioxide