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MIXED-MATRIX-MEMBRANES FUNDED PROJECTS 3.9 Mixed-Matrix membranes for gas separation BMBF Project FKZ 033RC1018 Project Coordination: Torsten Brinkmann, Helmholtz-Zentrum Geesthacht, Institut für Polymerforschung Project Partner: Technische Universität Berlin, Sterling Fluid Systems Holding GmbH, Blücher GmbH 3.9.1 Introduction Membrane technology is now an accepted industrial unit operation for the effective separation of gas mixtures. Membrane technology is used in the chemical and petrochemical industries to separate hydrogen, oxygen and carbon dioxide as well as to separate higher hydrocarbons from the ‘perma- nent’ gases. Examples of the latter include the separation of organic vapours from exhaust air streams, the recovery of monomers during the manufac- ture of polymers and adjusting the hydrocarbon dew point of natural gas or associated petroleum gas. When used in such applications, membrane separation is often superior to competing processes such as absorption, ad- sorption or cryogenic separation, or it can be combined with them to form beneficial hybrid processes [1]. At present, the membranes used for this type of separation operation are thin-film composite membranes with separation layers made from poly(di- methylsiloxane) (PDMS) or poly(octylmethylsiloxane) (POMS). One of the main disadvantages of these materials is that their selectivity towards high- er hydrocarbons decreases with the increasing fugacity of these components in the feed gas stream. On the other hand, a major advantage of these mate- rials is their high permeance, i.e. their selective permeability with respect to hydrocarbons, which enables the design and construction of competitive- ly priced membrane systems [1] that are superior in performance to estab- lished conventional methods of separation. To address the problem of decreasing selectivity, this project applied the mixed-matrix membrane (MMM) concept [2] and introduced high-perfor- mance adsorbents with a high affinity for heavy hydrocarbons into the pol- ymer matrix. The goal was to develop highly selective mixed-matrix mem- branes and to use them to create a separation technology that is better at separating higher hydrocarbons from permanent gases than earlier mem- brane-based processes or other competing separation techniques. 243PDF Image | Chemical Processes and Use of CO2
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