Record Display for the EPA National Library Catalog


Main Title Characterization of carbide lime to identify sulfite oxidation inhibitors /
Author Holcombe, L. J. ; Luke, K. W.
Other Authors
Author Title of a Work
Luke, K. W.,
CORP Author Radian Corp., Austin, TX.;Industrial Environmental Research Lab., Research Triangle Park, NC.
Publisher Environmental Protection Agency, Office of Research and Development ; For sale by the National Technical Information Service,
Year Published 1978
Report Number EPA-600/7-78-176; EPA-68-02-2608
Stock Number PB-286 646
OCLC Number 04702141
ISBN pbk.
Subjects Lime ; Carbides ; Sulfites ; Oxidation ; Sulphites
Additional Subjects Air pollution control ; Electric power plants ; Sulfites ; Oxidation ; Flue gases ; Inhibitors ; Chemical analysis ; Volumetric analysis ; Mass spectroscopy ; Gas chromatography ; X ray diffraction ; Infrared spectroscopy ; Assessments ; Sulfates ; Thiosulfates ; Calcium oxides ; Carbide lime
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EKBD  EPA-600/7-78-176 Research Triangle Park Library/RTP, NC 08/04/1995
ELBD ARCHIVE EPA 600-7-78-176 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ESAD  EPA 600-7-78-176 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-286 646 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation vii, 70 p. : ill. ; 28 cm.
The report gives results of a study of carbide lime--a by-product of acetylene manufacture, primarily calcium hydroxide--used in a flue gas desulfurization (FGD) system at Louisville Gas and Electric (LGE). The study was undertaken to: identify sulfite ion oxidation inhibitors in carbide lime, and develop an analytical method for sulfite that avoids the interferences observed in analyzing scrubber liquors from LGE's FGD system. Thiosulfate was identified as the oxidation inhibitor in carbide lime; it was also identified (along with other reduced sulfur species) as a source of interference in the iodine titration method used at LGE for sulfite analysis. Bench-scale tests verified the presence of thiosulfate as a major inhibition to sulfite oxidation in simulated scrubber liquors. This means that the low oxidation rate (e.g., that reported at LGE with carbide lime) results in a greatly reduced tendency to calcium sulfate (gypsum) scaling, therefore a greatly improved FGD system reliability. The amount of thiosulfate required for scale-free scrubber operation is unknown. However, to bring the thiosulfate level of commercial lime up to that found in carbide lime would cost $1.50 per ton of lime (using sodium thiosulfate pentahydrate at $12 per 100 pounds). The ion chromatograph was found to be the best analytical tool for determining sulfite concentrations in carbide lime liquors.
Contract no. 68-02-2608, task no. 21, program element no EHE624A. Issued Sept. 1978. Includes bibliographical references.