Abstract
AbstractPower ultrasound provides a surfactant‐free means of emulsifying dense near‐critical carbon dioxide and water. Droplet size distributions and volume fractions of the dispersed phases have been measured for acoustically formed emulsions. Hydrolysis rates were measured for a series of 7 benzoyl halides under both silent, phase‐separated conditions and for sonicated, emulsified conditions (30°C, 80 bar, 0.6 W/cm3, 20 kHz). Sonication always accelerated the overall hydrolysis rate, sometimes by as much as 200‐fold. Two physical models were developed to describe global kinetics: one for silent and one for sonicated conditions. The model for silent conditions agreed well with the available data set and suggested conditions under which reaction in the carbon dioxide phase (rather than the water phase) might become important. The model for sonicated conditions properly captured the trends in the data set and predicted the experimental results to within a factor of 2 in the worst case. Our analysis strongly suggests that ultrasound accelerates phase‐transfer reactions by increasing the water/carbon dioxide interfacial area. © 2005 American Institute of Chemical Engineers AIChE J, 2006
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
