The goal of this project is the development of multilayer polymeric membranes for liquid separation. The main target is the application in the pharmaceutical industry for the separation of complex mixtures of molecules with size smaller than 500 g/mol. The membranes are mainly prepared by interfacial polymerization as flat-sheet or hollow fibers.   The characterization methods are chromatography, electron microscopy, and performance tests mimicking operational conditions. There will be possibilities of scaling up the membranes with the best performance.