Improvements in or relating to liquid-liquid extractions

摘要

1,145,184. Separating liquids. METALLGESELLSCHAFT A.G. 24 Aug., 1966 [25 Aug., 1965], No. 38039/66. Heading B2J. An electro static separator improves the extraction rate in separating organic compounds in an organic solvent, by applying an electric field of between 1 and 60 volts/cm with D.C. or A.C. of 10-500 volts, the polar phase in the mixture being present in about 20-. 75% of the total mixture. The current to the electrodes is switched on for 0.1 to 1.0 seconds and off for 0.2 to 1.0 seconds periodically. The apparatus comprises a feed and mixing pump 1 supplied by pipes 2, 3 with the two liquid phases, a separator chamber 4 having three electrodes 5a, b, c (which may be deflector plates, slotted or perforated plates, wire mesh or round section material and tubes) and insulating bushings 7a, b, c to the electrodes. The separated light and heavy phases are removed via outlet pipes 8, 9 respectively. Optionally, electrodes may be provided, additionally or exclusively in the admission pipe 10. The polar phase, as described, is N-methylpyrrolidone containing 12% water, and the non-polar phase a mixture of pentane and toluene.