Process for removing SOX and NOX compounds from gas streams

Patent · Tue May 15 04:00:00 EDT 1984

OSTI ID:6313650

Hass, R H

A process for removing SO /SUB x/ pollutants from a stack gas by (1) absorbing the SO /SUB x/ pollutants into an aqueous absorbent containing a formate compound and (2) regenerating the spent absorbent containing dissolved SO /SUB x/ compounds by contact, in the presence of added formate anion, with a water-insoluble, solid substance containing one or more tertiary amine functional groups. Nitrogen monoxide is removed by providing in the aqueous absorbant an iron (II) chelate, such as a chelate of ferrous ion with ethylenediaminetetraacetic acid. Regeneration of the spent absorbent containing absorbed NO is accomplished under the same conditions as for spent absorbents containing absorbed SO /SUB x/ compounds. SO /SUB x/ and NO pollutants dissolved in the absorbent are, during regeneration, converted to hydrogen sulfide and nitrogen, respectively.

• Assignee: Union Oil Company of California
• Patent Number(s): US 4448899
• OSTI ID: 6313650
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACETIC ACID
ADSORBENTS
AIR POLLUTION CONTROL
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CATALYTIC EFFECTS
CHALCOGENIDES
CHELATES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COMPLEXES
CONTROL
DENITRIFICATION
DESULFURIZATION
ELEMENTS
FORMATES
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
IRON COMPOUNDS
MONOCARBOXYLIC ACIDS
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REGENERATION
SULFIDES
SULFUR COMPOUNDS
SULFUR OXIDES
TRANSITION ELEMENT COMPOUNDS
WASTES