Potential of silver-based room-temperature ionic liquids for ethylene/ethane separation

L.M. Galan Sanchez, G.W. Meindersma, A.B. Haan, de

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    The potential of room-temperature ionic liquids (RTILs) in separating ethylene from ethane is investigated. The absorption of olefins is enhanced by chemical absorption via p-complex formation with a transition-metal cation added to a standard RTIL. The effects of the ionic liquid structure of silver-based RTILs that contain Ag(I) salts (AgNO3, Ag[TfO], and Ag[Tf2N]) on gas absorption and solvent stability are investigated. The absorption isotherms of C2H4 and C2H6 into standard RTILs and designed silver-based RTILs were measured with a gravimetric balance between 303 and 333 K and up to 10 bar. C2H4 absorption was chemically enhanced in the silver-based RTILs and was considerably higher than that in the standard RTILs. Absorption of C2H6 in the silver-based RTILs is based on physical interactions only. The olefin/paraffin selectivity at a pressure of 1 bar was 30-50 higher in the silver-based RTILs than in standard ionic liquids.
    Original languageEnglish
    Pages (from-to)10650-10656
    JournalIndustrial and Engineering Chemistry Research
    Issue number23
    Publication statusPublished - 2009


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