Record Display for the EPA National Library Catalog

RECORD NUMBER: 39 OF 44

OLS Field Name OLS Field Data
Main Title Structural Changes in Surfactant-Modified Sorbents during Furnace Injection.
Author Kirchgessner, D. A. ; Jozewicz, W. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab. ;Acurex Corp., Research Triangle Park, NC.
Publisher cMar 89
Year Published 1989
Report Number EPA/600/J-89/008;
Stock Number PB89-236384
Additional Subjects Air pollution control ; Sorbents ; Surfactants ; Sulfur dioxide ; Particle size ; Calcium hydroxides ; Sintering ; Porosity ; Surface chemistry ; Diffusion ; Chemical reactions ; Experimental design ; Reprints ; Limestone injection multistage burners process ; Calcium lignosulfonate
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB89-236384 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/18/1989
Collation 9p
Abstract
The paper discusses a calcium hydroxide (Ca(OH)2) sorbent, modified by the addition of calcium lignosulfonate, that was recently developed for use in EPA's LIMB (limestone injection multistage burners) process. The increased reactivity with sulfur dioxide (SO2) displayed by this modified sorbent has been shown to be caused, in part, by its decreased particle (agglomerate) size compared to conventional Ca(OH)2. Subsequent work has shown that surfactant-modified Ca(OH)2 also undergoes significantly different structural changes during furnace injection. For a given reactor temperature and residence time, the modified sorbent calcines to a greater extent that unmodified sorbent. It also loses surface area more slowly, and retains more of its porosity, suggesting that it sinters more slowly than conventional sorbent. Therefore, in addition to reducing the particle size of Ca(OH)2 in some applications, calcium lignosulfonate also appears to cause the water of hydration to be bound less tightly, and to inhibit one or more of the diffusion mechanisms responsible for the process of sintering.