Abstract
This first study of electrospraying of a liquid into a dense, supercritical fluid has demonstrated a new method for dispersing aqueous liquid into supercritical carbon dioxide (SC-CO2) using pulsed high-voltage electric fields. The electrodispersion cell (EDC) was equipped with a laser light scattering system to determine the dependence of mean droplet size on operating variables such as field strength, pulse frequency, and liquid flow rate. Over a range of operating conditions, electrospraying produced micron-size aqueous dispersions with high interfacial area, and the micron-size dispersions were very efficiently coalesced by the wire-mesh electrode so that entrainment of liquid in the CO2 flowing from the cell was negligible. In related work elsewhere, results have been presented on the effects of temperature and pressure of the SC-CO2 on the droplet size and on the extraction of ethanol from an aqueous solution into SC-CO2 using the EDC. This new method of contacting an aqueous phase with SC-CO2 may find initial applications in cases where small quantities of a valuable component must be separated from water. * Managed by Lockhead Martin Energy Research Corp. for the U.S. Department of Energy under contract DE-AC05-96OR22464.
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