Record Display for the EPA National Library Catalog


Main Title Development of New and/or Improved Aqueous Processes for Removing SO2 from Flue Gases. Volume II.
Author Graef, A. F. ; Gressing, L. E. ; Mille, F. E. ;
CORP Author Envirogenics Co., El Monte, Calif.
Year Published 1970
Report Number PH-86-68-77; 0620;
Stock Number PB-196 781
Additional Subjects ( Air pollution ; Sulfur dioxide) ; ( Adsorption ; Sulfur dioxide) ; ( Zinc oxides ; Adsorbents) ; ( Air pollution control equipment ; Scrubbers) ; ( Sulfites ; Oxidation) ; Feasibility ; Cost estimates ; Economic analysis ; Operating costs ; Nitrogen oxides ; Particle size ; Fluidized bed processing ; Roasting ; Nitrogen dioxide ; Flue gases ; Materials recovery ; Sodium sulfites ; Carbonates ; Magnesium oxides ; Osmosis ; Combustion products ; Iron ; Waste gas recovery ; Air pollution control
Library Call Number Additional Info Location Last
NTIS  PB-196 781 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 172p
Efficient absorption of SO2 at flue gas concentrations can be effected through the use of dry, fluidized basic materials in the range of 50 to 60 C, if sufficient water is incorporated into the gas phase upstream of sorbent contactor. The formation of sulfate can be essentially eliminated in a fluidized bed absorber, and reduced to a very low value in an aqueous absorber, through the use of ferrous ion in an aqueous prescrubber to reduce NO2 to NO. The thermal decomposition of both zinc and magnesium sulfites is markedly promoted by the presence of steam. A new process for the removal of SO2 from flue gas is described in which dry fluidized zinc oxide is used as the absorbent. The oxide is recovered for reuse upon thermal decomposition of the resulting sulfite, and the liberated SO2 is recovered as such. Little or no sulfate is formed. NOx (especially NO2) is the major contributor to oxidation of the sorbent in aqueous solution systems. The efficiency of SO2 removal from flue gas is not affected by the presence of NOx. The economics of the conceptualized fluidized-bed zinc oxide process appear to be superior to other regenerable processes for the removal of SO2 from flue gases. (Author)