Regeneration of sulfated metal oxides and carbonates

Patent · Tue Mar 28 00:00:00 EST 1978

OSTI ID:863043

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

---

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 (United States)
• 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

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