||Advanced concepts, SO2 removal process improvements /
Potts, John M. ;
Jordan, John E.
||Tennessee Valley Authority, Muscle Shoals, AL. Div. of Chemical Development.;Industrial Environmental Research Lab., Research Triangle Park, NC.
|| U.S. Environmental Protection Agency, Industrial Environmental Research Laboratory ; National Technical Information Service [distributor],
||TVA Y-139; EPA/600/7-78/216
Flue gases--Desulfurization ;
Sulfite pulping process--Environmental aspects ;
Scrubber (Chemical technology) ;
Flue gases--Desulphurization ;
Sulphite pulping process--Environmental aspects
Air pollution control equipment ;
Sulfur dioxide ;
Potassium sulfates ;
Thermal degradation ;
Industrial wastes ;
Combustion products ;
Sulfuric acid ;
Sodium sulfites ;
Performance evaluation ;
Melamine process ;
||Some EPA libraries have a fiche copy filed under the call number shown.
||xi, 155 pages : illustrations ; 28 cm.
The report gives results of a study of a potassium scrubbing system that recovers useful forms of sulfur from pollutants while using a low-energy process to regenerate the absorbing medium. The report also describes two versions of a new, regenerable process for SO2 scrubbing that show promise for further development; they are based on absorption in a melamine slurry, followed by low temperature thermal or chemical regeneration. No solids requiring disposal are generated by the potassium scrubbing system. Laboratory tests of the scrubbing, thermal decomposition, and reduction steps show that the process (based on the precipitation of potassium pyrosulfite) is feasible. The absorbing solution is regenerated by thermal stripping of one-third of the pyrosulfite and chemical reduction of the remainder to form hydrogen sulfide. Elemental sulfur is obtained via the Claus reaction. The report includes studies of the oxidation of various sulfite compounds produced in several different SO2 scrubbing processes. Using laboratory, bench-scale equipment of new design, the sulfites of ammonia, potassium, zinc, and calcium were successfully oxidized with high efficiency. Such oxidation will be beneficial to the value of the products and to improve physical properties or reduce chemical oxygen demand of the waste.
"November 1978." Includes bibliographical references. "TVA Y-139." "EPA interagency agreement no. IAG-D6-E721-BM, program element no. EHE624." Microfiche.