Activation of calcium oxide as a sorbent
The sorbent capacity of calcium oxide with respect to sulfur dioxide is increased by calcining limestone or dolomite in an atmosphere where the partial pressure of carbon dioxide is greater than 40 percent of the equilibrium partial pressure of carbon dioxide over calcium carbonate at the reaction temperature. Where dolomite is the starting material, it may be calcined in a two-step heating process in which the atmosphere during the first heating stage contains carbon dioxide and the temperature is maintained in the dissociation range of magnesium carbonate (MgCo/sub 3/); the atmosphere of the second heating stage also contains carbon dioxide, but the temperature is maintained in the calcium carbonate (CaCo/sub 3/) dissociation range. Calcium oxide so produced in such an atmosphere of carbon dioxide sufficient to delay calcination is found to have relatively large mouthed pores capable of sorbing increased amounts of sulfur.
- Assignee:
- U S Of America Administrator Of Environ Prot. Agency
- Patent Number(s):
- US 4226839
- OSTI ID:
- 6578742
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCINATION
CALCIUM COMPOUNDS
CALCIUM OXIDES
CARBON COMPOUNDS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DESULFURIZATION
DOLOMITE
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
LIMESTONE
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POWER PLANTS
PYROLYSIS
REMOVAL
ROCKS
SEDIMENTARY ROCKS
SORPTIVE PROPERTIES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
WASTES