Process for removing SOx and NOx compounds from gas streams

Patent · Tue Sep 16 04:00:00 EDT 1980

OSTI ID:6712409

Hass, R H

A process is given for removing SOx pollutants from a stack gas by (1) absorbing the SOx pollutants with an aqueous absorbent containing a formate compound and (2) regenerating the spent absorbent containing dissolved sox 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 an aqueous absorbent of an iron(II) chelate, such as a chelate of ferrous ion with ethylenediaminetetraacetic acid. Regeneration of spent absorbent containing absorbed no is accomplished under the same conditions as for spent absorbents containing absorbed sox compounds. Sox and no pollutants dissolved in the absorbent are, during regeneration, converted to sulfur and nitrogen without the discharge of waste solids.

• Assignee: Union Oil Co of California
• Patent Number(s): US 4222991
• OSTI ID: 6712409
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR POLLUTION CONTROL
AMINO ACIDS
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHELATING AGENTS
CHEMICAL REACTIONS
COMPLEXES
DENITRIFICATION
DESULFURIZATION
EDTA
FLUE GAS
FORMATES
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
IRON COMPLEXES
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POWER PLANTS
REMOVAL
SULFUR COMPOUNDS
SULFUR OXIDES
THERMAL POWER PLANTS
TRANSITION ELEMENT COMPLEXES
WASTES