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Desulfurization process

Patent ·
OSTI ID:5492029
;
This patent describes improvement in a fossil fuel combustion process involving the generation of a flue gas product containing sulfur oxides and halogen compounds wherein an alkali metal compound is contacted with the gas resulting in the removal of sulfur oxides from the gas and formation of a water-soluble residue comprising an alkali metal sulfate and alkali metal halides, which residue is collected from the gas before the gas is released to the environment, and the recovery of the alkali metal ions from the collected residue for use in supplying the alkali metal that is contacted with the gas. The improvement comprises dissolving the residue in water to form an aqueous solution thereof having a pH of less than about 8 so that sulfate ions, halogen ions and alkali metal ions are present therein, and thereafter contacting the solution with a weak base anion-exchange resin having bicarbonate groups associated therewith that exchange with sulfate and halogen ions in the solution so that the sulfate and halogen ions become associated with the resin and the bicarbonate groups become associated with the alkali metal ions in the solution, whereby the alkali metal ions are separated from the sulfate ions and halogen ions for use in supplying the alkali metal compound that is contacted with the gas.
Assignee:
Univ. of Tennessee Research Corp., Knoxville, TN (United States)
Patent Number(s):
US 5059406; A
Application Number:
PPN: US 7-510101
OSTI ID:
5492029
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
014000 -- Coal
Lignite
& Peat-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COMBUSTION PRODUCTS
CONTROL
DESULFURIZATION
ENERGY SOURCES
FLUE GAS
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUELS
GASEOUS WASTES
POLLUTION CONTROL
POWER PLANTS
THERMAL POWER PLANTS
WASTES