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In 100 ml of an aqueous solution containing 20% by volume of ethanol were incorporated 100 ml of a mixed liquid comprising trioctyl phosphate and 2,6,10,14-tetramethylpentadecane at a weight ratio of 2:1 and 0.2 g of sodium laurylsulfate, and ultrasonic vibration having a frequency of 28 KHz was applied to the liquid mixture for 2 minutes to form an emulsion in which particles of the trioctyl phosphate/2,6,10,14-tetramethylpentadecane mixed liquid having an average particle diameter of 0.3 μm were dispersed in the aqueous solution of ethanol. The emulsion was filtered at a potential gradient of 4.5 V/cm under a pressure of 0.01 kg/cm2 through a polytetrafluoroethylene porous membrane having a nominal average pore size of 2.0 μm. Only the phase of trioctyl phosphate/2,6,10,14-tetramethylpentadecane dispersed in the form of particles permeated through the membrane at a flow rate of 48 kg/m2.hr, and the permeated liquid formed a continuous phase.