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ePaper created 2017-03-14, 10:25:37 | version 1.49.03
1st step 2nd step nth step state of the art EMPIRICAL electrophoretic mobility µ FFE 1.1 FFE 1.2 FFE 1.n FFE 2.1 FFE 2.2 FFE 2.n FFE n.1 FFE n.2 FFE n.n 3 Available FFE cells from the ield of analytics have ixed sizes. Using the conventional method of solving customer-speciic separation problems, the process parameters are adapted to the separation problem; the limitations of the FFE cell remain unchanged. This frequently reduces the eficiency of the separation process and / or the product quality. The approach adopted by Fraunhofer IGB combines the process and plant design in order to eliminate these disadvantages. If a separa- tion problem cannot be solved by varying those process pa- rameters that do not negatively inluence the product quality, the FFE cell can be adapted to solve the separation problem. This modiication has further advantages. The separation chamber is always designed to exactly the required width. As a result, the energy consumption is reduced because the electric voltage drop decreases through the FFE cell. Also, the FFE cell throughput can be increased and the process media consumption as well as the material costs for the FFE cell can be reduced. By setting up sequential FFE cells that operate on the 0 / 1 principle (Fig. 2), Fraunhofer IGB optimizes the eficiency of an FFE system in terms of the use of chemicals, energy and the separation performance. Parallelization (Fig. 3) further increases the throughput and permits simple operation of the FFE system. Applications Free low electrophoresis offers numerous industrial applica- tion possibilities such as in the production and recovery of precious metals (both in mining and in recycling), in down- stream processing, in diagnostics and in the production of pharmaceuticals. new development CALCULATION probe sample measurement: sum parameter calculation: µ operation: FFE cell calculation: µ analysis: N*100 fractions determine: migration distance µempirical µcalculated considerable effort available quickly 4 Contact Dr. rer. nat. Thomas Scherer Phone +49 711 970-4091 thomas.scherer@igb.fraunhofer.de Dipl.-Ing. Siegfried Egner Phone +49 711 970-3643 siegfried.egner@igb.fraunhofer.de Funding The work was conducted within the Fraunhofer Lighthouse proj- ect “Critical Rare Earths”. The Fraunhofer-Gesellschaft intends to strengthen Germany as a business location by rapidly transform- ing original scientiic ideas into marketable products through its Lighthouse Project initiative. Project partners Fraunhofer Institutes IWMS, IWM, IWU, IWKS, IGB, IFAM, ISI and LBF Further information www.seltene-erden.fraunhofer.de 1 FFE laboratory setup. 2 Sequential 0/1 principle. 3 Parallelization of a FFE cell sequence. 4 Method developed for calculating the electrophoretic mobility µ. 8 5