CO₂ removal with 'switchable' versus 'classical' ionic liquids

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    Abstract

    Switchable ionic liquids (SILs) are promising solvents for CO2 separation due to their high CO2 capturing efficiency and easy preparation compared to 'classical' ionic liquids. Considering viscosity, the present study has demonstrated that SILs formed at least two times stronger chemical bonds with CO2 than studied classical ionic liquids (ILs). Furthermore, the reversible properties of SILs were confirmed by evaluation of different regeneration methods. On average, molar fractions of CO2 were more than 0.3 outperforming acetate-based ILs (molar fraction of CO2 around 0.25) and more than ten times the capacity of physical ionic liquids (molar fraction 0.02). Consequently, SILs are found to be efficient CO2 absorbents operating at atmospheric pressure.
    Original languageUndefined/Unknown
    Pages (from-to)42–50
    Number of pages9
    JournalSeparation and Purification Technology
    Volume97
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • CO2 capture
    • Viscosity
    • Ionic liquids
    • Regeneration
    • Switchable solvents

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