In the present work, oil-in-water emulsions were prepared with toluene-water as working system, sodium lauryl sulfate as emulsifier,and α-Al_2O_3 ceramic membrane with pore size of 1.5 μm as emulsifying medium in a new submerged emulsification apparatus. The effects of stirring speed,transmembrane pressure and emulsifier concentration on the droplet size of emulsions and its distribution as well a……