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RECORD NUMBER: 4 OF 9

OLS Field Name OLS Field Data
Main Title Investigation of the Limestone-SO2 Wet Scrubbing Process.
Author Coutan, R. W. ; Cherr, R. H. ; Rosenber, H. ; Genc, J. ; Lev, A. ;
CORP Author Battelle Memorial Inst., Columbus, Ohio. Columbus Labs.
Year Published 1969
Report Number PH-86-68-84; 17;
Stock Number PB-188 708
Additional Subjects ( Air pollution ; Sulfur compounds) ; ( Limestone ; Waste gases) ; Chemical engineering ; Reaction kinetics ; Chemical analysis ; Particle size ; Scrubbers ; Sulfur dioxide ; Dolomite(Mineral) ; Hydration
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-188 708 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 75p
Abstract
The wet lime-SO2 scrubbing process was investigated on a laboratory scale in support of full-scale prototype studies. The investigation consisted of laboratory scale experiments in the following areas: Measurement of the overall rate of uptake of SO2 in a stirred-pot reactor; Measurement of the relative rates of hydration of selected limestones and dolomites; Measurement of the relative rates of dissolution of selected limestone and dolomite materials; Chemical analysis of selected dolomite- and limestone-based liquors prepared at three temperatures. These experiments were designed to yield qualitative indications of the importance of individual physical and chemical processes to the overall limestone-SO2 wet scrubbing process. The results of the current experiments indicate that lime in particulate form reacts readily with various sulfur species or carbonate in solution to yield a coating which inhibits utilization of the bulk of the lime. The two primary variables studied were the flue gas and the scrubber-liquor compositions. The results indicate a strong dependence of hydration rate on the conditions of calcination of the stone and particle size. The results also indicate that the rate of the hydration process is limited by diffusion of water through the lime particle, and that over-burning of the lime markedly decreases hydration rate. Other experiments, using partically sulfated limes or solutions containing SO4(-2), showed that hydration rates are severely limited by the presence or formation of a layer of sulfate on the lime particles. Rates of dissolution of hydrated lime were determined in a well-stirred system using a calcium ion-specific electrode and a pH electrode for monitoring the concentrations of Ca(++) and OH(-) in solution. (Author)