Influence of cavitation on ethanol enrichment in an ultrasonic atomization system

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Journal titleJournal of Chemical Engineering of Japan
Pages616622; # of pages: 7
SubjectBulk liquid; Collapsing bubble; Ethanol concentrations; Ethanol enrichment; Feed concentration; High frequency; Higher frequencies; Input power; Ki solution; Separation mechanism; Surface excess; Ultrasonic atomization; Ultrasonic parameters; Atomization; Blast enrichment; Cavitation; Liquids; Potassium; Potassium iodide; Separation; Vapors; Ethanol
AbstractEthanol was separated from aqueous solutions through ultrasonic atomization. Ethanol enrichment was evaluated by determining ethanol concentration in condensates collected from atomized mist and vapor. The amount of collected mist and vapor accorded with the amount of liquid left from the atomization column. In the limited range of ethanol feed concentration below 30 mol%, the ethanol concentration in the condensates was affected by ultrasonic parameters such as frequency and input power. Ethanol enrichment was enhanced at higher frequencies and lower input power. The effect of ultrasonic parameters on ethanol enrichment was interpreted from the viewpoint of cavitation. Potassium iodide oxidation was conducted to examine the occurrence of cavitation, and the number of violently collapsing bubbles. The use of higher frequency and lower input power, which corresponded to enhance ethanol enrichment, resulted in a decrease in KI reactivity. This trend suggests that violently collapsing bubbles enhanced fragmentation of the bulk liquid where no separation mechanism works. Assuming that the surface excess of ethanol plays a significant role in the separation, possible routes of ethanol transfer from liquid to mist or vapor are suggested. © 2011 The Society of Chemical Engineers, Japan.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21271138
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Record identifierf5691e8a-f715-48dd-aad6-fea2dfb47928
Record created2014-03-24
Record modified2016-05-09
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