Record Display for the EPA National Library Catalog


Main Title Thiosulfate as an Oxidation Inhibitor in Flue Gas Desulfurization Processes: A Review of R and D Results.
Author Rochelle, G. T. ; Owens, D. R. ; Chang, J. C. S. ; Brna, T. G. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab. ;Texas Univ. at Austin. ;Acurex Corp., Research Triangle Park, NC.
Year Published 1986
Report Number EPA/600/J-86/277;
Stock Number PB87-167730
Additional Subjects Air pollution control ; Flue gases ; Desulfurization ; Sodium thiosulfates ; Sodium inorganic compounds ; Calcium oxides ; Calcium carbonates ; Pilot study ; Reprints ; Stationary sources
Library Call Number Additional Info Location Last
NTIS  PB87-167730 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 11p
The article describes the pilot-plant testing of sodium thiosulfate (Na2S2O3) as an oxidation inhibitor in flue gas desulfurization by lime and limestone slurry scrubbing with and without MgO and adipic acid additives. The effectiveness of thiosulfate is proportional to the inhibitor product, defined as the product of thiosulfate concentration (M), calcium concentration (M), and the moles of SO2 absorbed per hour per liter of hold tank volume. Gypsum saturation was less than 100% and scaling was eliminated when the inhibitor product exceeded 0.3 times 10 to the minus 6 times M to the 3rd power/hr. Thiosulfate was relatively more effective in systems with chlorides and less effective in systems promoted by MgO. An inhibitor product greater than 10 to the minus 6 times M to the 3rd power/hr significantly enhanced dewatering of solids from limestone scrubbing. SO2 removal and/or limestone utilization were increased in systems that started with less than 10 mM dissolved calcium.