TECHNOLOGY Membrane system recovers, recycles propylene from polymer production

DSM Deutchland GmbH, Dusseldorf, is installing a $1 million propylene recovery unit in a polypropylene plant under construction in Geleen, The Netherlands. The system, designed by Membrane Technology & Research Inc. (MTR), Menlo Park, Calif., will recover propylene from plant vents and recycle it for polymerization. Nitrogen recovered by the process will be used to remove unreacted monomer from the polymer product. Technip is constructing the DSM plant, which will use the Amoco/Chisso polypropylene process, according to MTR. MTR says DSM's VaporSep system will be the largest of its kind. "We evaluated the available technologies for propylene recovery, including pressure swing ads...

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