Apparatus for removing sulfur dioxide from stack gases

Patent · Tue May 03 04:00:00 EDT 1977

OSTI ID:7300687

Field, E L; Lamantia, C R; Lunt, R R; Oberholtzer, J E; Valentine, J R

A method and apparatus for removing sulfur dioxide from stack gases are described. The stack gases are scrubbed with an aqueous wash liquid containing one or more alkali metal compounds which react to form the bisulfite, sulfite and sulfate salts of the alkali metal. The spent absorbent liquid effluent is then treated with calcium compounds in at least two separate reaction stages, the conditions of ion concentration and pH of the first stage being maintained to favor the precipitation of calcium sulfate in the presence of SO/sub 3//sup 2 -/ ions. In the succeeding reaction stages the precipitation of the desired amount of SO/sub 3//sup 2 -/ ions is carried out to form calcium sulfite. The resulting compound of calcium with sulfite and sulfate (which may in part be in the form of mixed crystals) are removed and the regenerated liquid is recycled.

• Assignee: Combustion Equipment Associates, Inc.
• Patent Number(s): US 4021202
• OSTI ID: 7300687
• 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
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
DESIGN
DESULFURIZATION
ELEMENTS
EQUIPMENT
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
INDUSTRIAL PLANTS
METALS
OPERATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION ABATEMENT
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
RECYCLING
REMOVAL
SCRUBBERS
SODIUM
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES