Design developments for the emulsion-phase contactor, including a two-electrode region and modulated electrical signals, have increased throughput such that the technology may be considered for industrial solvent extraction applications. Testing has been conducted to evaluate energy consumption, axial dispersion, and mass transport in lab-scale devices. Energy consumption on a volume basis was measured to be 2.4 W/L, which is several orders of magnitude less than that of conventional liquid-liquid contactors. A moderate amount of axial dispersion was measured, partly due to the open architecture and partly due to wall and end effects of the small experimental devices. Multistage mass transfer was demonstrated in a contactor with a 45-cm electrode height for the system of cupric ion transferring from an aqueous buffer solution to kerosene containing versatic acid. Mass transfer performance of up to four equivalent stages approached the limitations set by the hydrodynamics.