Removal of contaminants and recovery of by-products from hot waste gas stream

Patent · Tue Feb 03 04:00:00 EST 1981

OSTI ID:6479401

Bennett, D W; Katzen, R; Kaupisch, K F

A process is described for the removal of sulfur dioxide and other contaminants and the recovery of ammonium sulfate as a by-product from a hot waste gas stream. The method consists of: cooling the waste gas stream to a temperature below 120* F., passing said waste gas stream in sequence through at least two separate absorption zones utilizing as an absorbent a recirculated aqueous salt solution of ammonium sulfite-bisulfite, withdrawing and oxidizing a portion of said aqueous ammonium sulfite-bisulfite salt solution under pressures and temperatures sufficient to substantially convert the salts to sulfate salts, and recycling the ammonia and sulfur dioxide vapors liberated during oxidation to the first absorption zone.

• Assignee: International Telephone and Telegraph Corp
• Patent Number(s): US 4248842
• OSTI ID: 6479401
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AMMONIUM COMPOUNDS
AMMONIUM SULFATES
CHALCOGENIDES
CHEMICAL REACTIONS
DESULFURIZATION
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
RECOVERY
REMOVAL
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES