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    Asymmetric Hollow Fiber Membranes for Separation of CO 2 from Hydrocarbons and Fluorocarbons at High-Pressure Conditions Relevant to C 2 F 4 Polymerization

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    Type
    Article
    Authors
    Kosuri, Madhava R.
    Koros, William J.
    KAUST Grant Number
    KUS-11-011-21
    Date
    2009-12-02
    Permanent link to this record
    http://hdl.handle.net/10754/597616
    
    Metadata
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    Abstract
    Separation of high-pressure carbon dioxide from fluorocarbons is important for the production of fluoropolymers such as poly(tetrafluoroethylene). Typical polymeric membranes plasticize under high CO2 partial pressure conditions and fail to provide adequate selective separations. Torlon, a polyamide-imide polymer, with the ability to form interchain hydrogen bonding, is shown to provide stability against aggressive CO2 plasticization. Torlon membranes in the form of asymmetric hollow fibers (the most productive form of membranes) are considered for an intended separation of CO 2/C2F4. To avoid safety issues with tetrafluoroethylene (C2F4), which could detonate under testing conditions, safer surrogate mixtures (C2H2F 2 and C2H4) are considered in this paper. Permeation measurements (at 35 °C) indicate that the Torlon membranes are not plasticized even up to 1250 psi of CO2. The membranes provide mixed gas CO2/C2H2F2 and CO 2/C2H4 selectivities of 100 and 30, respectively, at 1250 psi partial pressures of CO2. On the basis of the measured separation performances of CO2/C2H 2F2 and CO2/C2H4 mixtures, the selectivity of the CO2/C2F4 mixture is expected to be greater than 100. Long-term stability studies indicate that the membranes provide stable separations over a period of 5 days at 1250 psi partial pressures of CO2, thereby making the membrane approach attractive. © 2009 American Chemical Society.
    Citation
    Kosuri MR, Koros WJ (2009) Asymmetric Hollow Fiber Membranes for Separation of CO 2 from Hydrocarbons and Fluorocarbons at High-Pressure Conditions Relevant to C 2 F 4 Polymerization . Ind Eng Chem Res 48: 10577–10583. Available: http://dx.doi.org/10.1021/ie900803z.
    Sponsors
    The authors thankfully acknowledge the financial support provided by National Science Foundation-Science and Technology Center (NSF-STC), a center for environmentally responsible solvents and processes. This publication was also based on work Supported in part by Award No. KUS-11-011-21 made by King Abdullah University of Science and Technology (KAUST). The authors also acknowledge Solvay Advanced Polymers for generously providing the Torlon.
    Publisher
    American Chemical Society (ACS)
    Journal
    Industrial & Engineering Chemistry Research
    DOI
    10.1021/ie900803z
    ae974a485f413a2113503eed53cd6c53
    10.1021/ie900803z
    Scopus Count
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