Membrane emulsification is a new technology to produce single emulsion (Oil in Water, W/O) with uniformly controlled particle size and also to produce double emulsion (O/W/O, W/O/W) with high yield. A large scale application was achieved already with the membrane emulsification using SPG. Membrane separation, bubbling element for efficiently dissolving gas into liquid, carrier for HPLC analysis and DNA synthesis are also newly developed applications for the porous glass materials.