Efficient Liquid Liquid Extraction By Emulsion Formation and Separation in Robust Milli-Fluidic Devices

This project investigates the feasibility of increasing transport between phases during liquid liquid extraction by the use of milli-fluidic devices by increasing contact time.  In traditional liquid liquid extraction, separation by gravity limits contact time of emulsions.  Milli-fluidic devices allow this contact time to be extended and controlled, increasing predictability and efficiency.  The examined milli-fluidic process includes the formation of an emulsion, over which the contact time is controlled by tubing length, and an emulsion separation device.  The emulsion separation device utilizes the attraction of the aqueous phase to a hydrogel lining within the channel in order to stabilize colaminar flow of the aqueous and organic phases.  This process allows for the efficient separation of streams at a controlled time in order to increase mass transfer.  These devices handle greater liquid flows than previously recorded for milli-fluidic devices, increasing their potential application to industrial processes.  In industrial settings, milli-fluidic devices can reduce the volumetric flow required of the phases in order to carry out the process and obtain the desired amount of mass transfer.  Lowering the volume required for the process has an important impact potential in industries which deal with high value products.  This study examines a system of water, octanol, and FD&C red.