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Mass transfer enhancement in supercritical fluids extraction by means of power ultrasound

AuthorsRiera, Enrique; Golás Sánchez, Yolanda; Blanco Blanco, Alfonso; Gallego Juárez, Juan Antonio; Blasco, M.; Mulet, A.
KeywordsPower ultrasound
Supercritical fluids
Separation and extraction processes
Issue Date2004
CitationUltrasonics Sonochemistry 11 : 241-244 (2004)
AbstractThe use of high-intensity ultrasound represents an efficient manner of producing small scale agitation, enhancing mass transfer on supercritical fluids (SF) extraction processes. In this way, a supercritical CO2 extraction of oil from particulate almonds using power ultrasound was studied. To examine the effect of the acoustic waves all experiments were performed with and without ultrasound. A power ultrasonic transducer for a working frequency of about 20 kHz was constructed and installed inside a highpressure 5 l SF extractor. The experimental tests were carried out with CO2 at 280 bar and 55 C. Grounded almonds with an oil content of about 55%, in an amount of 1500 g were deposited inside the SF reactor where the solvent was introduced at a flow rate of 20 kg/h. The results show that the kinetics and the extraction yield of the oil were enhanced by 30% and 20% respectively, when a power of about 50 W was applied to the transducer. The average time of each extraction process was of about 8 h and 30 min. In addition, the transducer was also used as a sensitive probe capable to detect the phase behavior of supercritical fluids when it was driven with low power signals.
Description4 páginas, 6 figuras
Publisher version (URL)http://dx.doi.org/10.1016/j.ultsonch.2004.01.019
Appears in Collections:(CAEND) Artículos
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