Evaluation of static micromixers for flow-through extraction by emulsification

With increasing spread of microreaction technology an evaluation of microfluidic tools has become an important aspect. By using an extraction process of iodine from water to n-hexane in an emulsion, the usability of seven different micromixers was tested under same conditions. Extraction efficiency was defined and the dependence on flow rate, phase ratio and the behaviour of the generated emulsion after leaving the micromixer, passing the outlet tube, were observed. This method even provides the possibility to distinguish the micromixers in view of their extraction capability. The comparison among each other and with a simple T-junction shows significant differences in extraction behaviour, which can be interpreted as differences in emulsification behaviour.