Process for removing SOx and NOx compounds from gas streams

Patent · Tue Aug 31 04:00:00 EDT 1982

OSTI ID:6661341

Albertson, W; Hass, R H

A gas stream containing SOx and NOx compounds is first treated for SOx removal by absorbing the SOx components in an aqueous liquid absorbent comprising formic or oxalic acid and an alkanolamine containing a tertiary amine functional group. When spent, this absorbent is regenerated by subjection to an elevated temperature sufficient to produce sulfur and/or hydrogen sulfide. The SOx-purified gas recovered from the first absorption step is then treated for NOx removal by contact with a second liquid absorbent solution containing a ferrous chelate in an aqueous, acidic medium. This absorbent is regenerated by contact, under conditions of elevated temperature and pressure, and in the presence of added formate ion, with a catalyst comprising a water-insoluble substance containing one or more tertiary amine functional groups such that absorbed nox components are converted to elemental nitrogen.

• Assignee: Union Oil Co Of California
• Patent Number(s): US 4347227
• OSTI ID: 6661341
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
ABSORPTION
AIR POLLUTION CONTROL
AMINES
AQUEOUS SOLUTIONS
CARBOXYLIC ACIDS
CATALYSTS
CHALCOGENIDES
CHELATES
CHEMICAL REACTIONS
COMPLEXES
CONTROL
DENITRIFICATION
DESIGN
DESULFURIZATION
DICARBOXYLIC ACIDS
DISPERSIONS
ELEMENTS
EQUIPMENT
FLUE GAS
FORMIC ACID
GASEOUS WASTES
HEATING
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INDUSTRIAL PLANTS
IRON COMPLEXES
MIXTURES
MONOCARBOXYLIC ACIDS
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXALIC ACID
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PRESSURIZING
REGENERATION
SOLUTIONS
SULFIDES
SULFUR
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
WASTES