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Main Title Calcination of calcium hydroxide sorbent in the presence of SO2 and its effect on reactivity /
Author Jozewicz, Wojciech. ; Kirchgessner, D. A.
CORP Author Acurex Corp., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, Air and Engineering Research Laboratory,
Year Published 1989
Report Number EPA/600/D-89/045; AEERL-P-512; EPA-68-02-4701
Stock Number PB89-221345
Additional Subjects Air pollution control ; Calcium hydroxide ; Adsorbents ; Sulfur dioxide ; Reaction kinetics ; Chemical reactions ; Combustion products ; Surface chemistry ; Area ; Porosity ; Experimental design ; Calcium sulfates ; Calcination ; Limestone injection multistage burners
Library Call Number Additional Info Location Last
NTIS  PB89-221345 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 31 pages ; 28 cm
The paper discusses the calcination of Ca(OH)2 sorbent in the presence of SO2 and its effect on reactivity. When Ca(OH)2 is calcined in an isothermal flow reactor with 300 ppm or less SO2, the structure of the sorbent is characterized by retention of higher pore volumes and surface areas than when calcined in the absence of SO2. When reinjected into the isothermal flow reactor (1000 C, 3000 ppm, 0.8 s), a higher level of reactivity with SO2 is observed for the SO2-modified calcine than for the unmodified sorbent. Structural evidence suggests that a slower initial rate of sintering in the modified calcine accounts for its enhanced reactivity. It is postulated that deposition of small amounts of CaSO4 on pore faces and along crystal boundaries retards the solid state diffusion process responsible for sintering. The effects on sintering and reactivity of various combinations of residence time (0.6 - 2.0 s) and SO2 concentration (10 - 50 ppm) during precalcination have been tested.
"David A. Kirchgessner, project officer." "PB89-221345." "EPA/600/D-89/045." "April 1989." Microfiche.