Emulsions prepared by two-stage ceramic membrane jet-flow emulsification



To solve the paradox between the flux and droplet size in conventional membrane emulsification, a process including a two-stage ceramic membrane emulsification under jet flow was proposed. An apparatus integrating slurry reactor and membrane emulsification was used in this investigation. In the first stage, a ZrO2 ceramic membrane, with a nominal pore size of 0.16 μm, was used. The flux of the membrane was 150 L m−2 h−1 at a pressure of 0.35 MPa and a temperature of 20°C, and the droplet size of the emulsion was 54.69 μm. To obtain monodispersed emulsions with a small droplet size, a second ceramic membrane jet-flow emulsification was used. An α-Al2O3 ceramic membrane with a nominal pore size of 1.5 μm was selected as the emulsification medium. The flux was attained at 454 L m−2 h−1 at a pressure of 0.2 MPa, and the monodispersed emulsion with droplet size (D50) of 2.29 μm could be obtained. The effects of pressure, stirring speed, and emulsifier concentration on the second stage of the process were discussed in detail. © 2005 American Institute of Chemical Engineers AIChE J, 2005