In the separation by emulsion-type liquid membrane of benzene-cyclohexane mixture（the difference between the boiling points of the two components is small）, the effects of feed composition, the volume ratio of solvent to feed, surfactant concentration and glycerol concentration on the separation factor have been studied.
As the averages separation factor of 5.74 for this system at the contact time of 10 minutes for various feed composition, this technique has been found much more effective than the distillation method. Since the relative solubility ratio of benzene in benzene-cyclohexane mixture is greater than that of cyclohexane, the separation factor has been found to increase as the concentration of benzene inceases up to 70 mol per cent. It has also been found that the permeation of benzene has reached the maximum value when the volume ratio of solvent to feed is equal to four.
The separation has been most effective at the concentration of the surfactant below one weight per cent in which the separation factor increases rapidly with increasing contact time, while the contact time has nearly no effect on the separation factor at the surfactant concentration above one weight per cent. The separation factor has also been effective at the glycerol concentration of 50 weight per cent.