Regeneration of sulfated metal oxides and carbonates

Patent · Tue Mar 28 04:00:00 EST 1978

OSTI ID:7066491

Hubble, B R; Siegel, S; Cunningham, P T

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.

• Assignee: Dept. of Energy
• Patent Number(s): US 4081522
• OSTI ID: 7066491
• Country of Publication: United States
• Language: English

Related Subjects

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42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DESULFURIZATION
FLUE GAS
GASEOUS WASTES
MANAGEMENT
MATERIALS RECOVERY
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PROCESSING
RECOVERY
REDUCTION
REMOVAL
SULFATES
SULFUR COMPOUNDS
SULFUR OXIDES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES