Air pollution control process and apparatus

Patent · Tue Nov 04 04:00:00 EST 1986

OSTI ID:6991326

Rosenberg, H S; Genco, J M

This patent describes a continuous process for removing pollutants from waste gases which pollutants are present in the gas in the form of acid components. The process comprises: (a) introducing the waste gas into an evaporator tower where the gas is mixed with an aqueous solution of a salt of the acid component; (b) heat-vaporizing the resulting mixture in the evaporator so as to form salt crystals from the salt solution and withdrawing the salt crystals from the gas substantially without the pollutants and solids from the gas; (c) passing the gas through a separation device to remove the formed crystals together with solids initially present in the gas prior to passing the gas to an absorption tower; (d) then passing the now substantially dry gas including residual salt crystal to the absorption tower, introducing an alkaline absorbent into the tower. The absorbent is a liquid or forms a liquid in the tower and is adapted to form salts with the acid component of the gas in the form of an aqueous concentrated solution of the salt and to dissolve residual salt crystals present in the gas and introducing fresh water to the extent necessary to form and maintain the liquid absorbent and aqueous salt solution; (e) continuously circulating the formed salt solution out of and into the absorption tower; (f) while continuously withdrawing a controlled amount of the salt solution and recycling the amount into the evaporator tower for the gas-solids separation step and (g) discharging the pollutants-free gas from the absorption tower.

• Assignee: Industrial Resources, Inc., Lakewood, CO
• Patent Number(s): US 4620856
• OSTI ID: 6991326
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION
ADSORBENTS
AIR POLLUTION CONTROL
AQUEOUS SOLUTIONS
CONTROL
CRYSTALS
DISPERSIONS
EVAPORATION
EVAPORATORS
FLUE GAS
FRESH WATER
GASEOUS WASTES
HYDROGEN COMPOUNDS
MIXTURES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTANTS
POLLUTION CONTROL
PURIFICATION
RECYCLING
SALTS
SEPARATION EQUIPMENT
SOLUTIONS
WASTES
WATER