Processes for removal of sulfur dioxide from gases

Patent · Tue Dec 23 04:00:00 EST 1975

OSTI ID:7358186

Lewis, Jr, G W

A method is disclosed for treating flue gas and the like for sulfur dioxide removal and recovery. The gas, containing a minor but polluting amount of sulfur dioxide, is contacted with ammonia in a reaction chamber. The reaction product is caused to precipitate onto a heat sink where it is mechanically removed on a continuous basis. The removed compounds are recycled by one of three ways: (1) by subjecting them to carbon monoxide to obtain sulfur and ammonia, (2) by heating the materials in a vacuum to remove much of the sulfur dioxide, or (3) by volatilizing them and passing the vapors through a metal carbonate to obtain ammonia, carbon dioxide and a metal sulfite. In the second process ammonium sulfite is recycled to the reaction chamber and subsequently precipitates as ammonium bisulfite. 13 Claims, 4 Drawing Figures

• Assignee: TIC; EDB-76-034061; ERA-01-012928
• Patent Number(s): US 3928536
• OSTI ID: 7358186
• 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
AMMONIA
CHALCOGENIDES
CHEMICAL REACTIONS
DESIGN
DESULFURIZATION
EQUIPMENT
FLUE GAS
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
HYDRIDES
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
REMOVAL
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMAL POWER PLANTS
WASTES