Species-Differentiating Continuous Monitor for Airborne Acids.
Quarterly progress rept. Jul-Sep 75,
ORION RESEARCH INC CAMBRIDGE MASS
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The sources and levels of airborne nitric and sulfuric acids are briefly reviewed. A theoretical study, based on known vapor pressures and thermodynamic properties, concludes that in normal industrial environments virtually all of the nitric acid will be present as vapor, and that virtually all of the sulfuric acid will be as aerosol droplets. Several new collection techniques for separating the two species are proposed. Of these, the most promising appears to be absorption of acidic gases in a wetted-wall scrubber, followed by impingement collection of the aerosol in an ultrasonically-generated aqueous mist. Preliminary experimental results indicate that wetted wall columns can be constructed which will absorb 99 of the acid gases, and pass 98 of the mist droplets. Author
- Air Pollution and Control