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Sodium-limestone double alkali flue gas desulfurization process with improved limestone utilization

Patent ·
OSTI ID:6247446
; ;

This patent describes a sodium-limestone double alkali process for the continuous desulfurization of flue gas, having the steps of absorbing sulfur dioxide from an SO/sub 2/-containing gas stream in an absorber with an aqueous solution of sodium sulfite and sodium bisulfite, diverting at least a portion of the absorber effluent solution for regeneration with limestone, introducing limestone into the diverted absorber effluent solution to convert bisulfite to sulfite, separating by-product solids from the limestone-treated solution, and returning regenerated solution to the absorber, the improvement for increasing the utilization of the limestone used during the regeneration operation.

Assignee:
FMC Corp., Philadelphia, PA
Patent Number(s):
US 4687648
OSTI ID:
6247446
Country of Publication:
United States
Language:
English

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Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORPTION
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
ALKALI METALS
AQUEOUS SOLUTIONS
BY-PRODUCTS
CARBONATE ROCKS
CEA-ADL DUAL ALKALI PROCESS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
DISPERSIONS
ELEMENTS
FLUE GAS
FLUID FLOW
GAS FLOW
GASEOUS WASTES
KINETICS
LIMESTONE
METALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
RECYCLING
REGENERATION
ROCKS
SEDIMENTARY ROCKS
SLURRIES
SODIUM
SODIUM COMPOUNDS
SOLIDS
SOLUTIONS
SORPTION
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SUSPENSIONS
WASTES
YIELDS