Flue gas desulfurization/denitrification using metal-chelate additives
This patent describes a method for removing SO/sub 2/ and NO from flue gas containing oxygen resulting from the combustion of carbonaceous material which consists of: preparing an aqueous scrubber solution containing an aqueous sulfur dioxide sorbent and an active metal chelate, the active metal chelate being prepared by mixing a metal ion as a soluble metal salt in an aqueous solution with a chelating agent in an oxygen-free environment for a period of time sufficient for all the possible coordination sites on the chelating agent to coordinate with the metal ion, thereby forming the active metal chelate, and contacting the oxygen-containing flue gas containing at least l000 ppm SO/sub 2/ with the scrubber solution while maintaining the pH of the scrubber solution between 5 and 9, the SO/sub 2/ dissolving in the solution to form HSO/sub 3-/, the NO dissolving in the solution to form HNO/sub 2/, the HNO/sub 2/ reacting with some of the HSO/sub 3-/ to form hydroxylamine N-sulfonates, thereby removing SO/sub 2/ and NO from the flue gas.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4612175
- OSTI ID:
- 5338410
- Country of Publication:
- United States
- Language:
- English
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Flue gas desulfurization/denitrification using metal-chelate additives
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Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADDITIVES
ADSORBENTS
AIR POLLUTION CONTROL
AMINES
AQUEOUS SOLUTIONS
CHALCOGENIDES
CHELATES
CHELATING AGENTS
CHEMICAL REACTIONS
COMPLEXES
CONTROL
DENITRIFICATION
DESULFURIZATION
DISPERSIONS
DISSOLUTION
ELEMENTS
FLUE GAS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXYLAMINE
INORGANIC ACIDS
MIXTURES
NITRIC ACID
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PH VALUE
POLLUTION CONTROL
QUANTITY RATIO
REMOVAL
SOLUTIONS
SULFONATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFURIC ACID
WASTES