Carbon Dioxide Capture by Tertiary Amidine Functional Adsorbents

TL;DRAbstract

In the recent past carbon dioxide capture from gas streams has been done using multiple methods. These methods include cryogenic, membrane, O2/CO2 recycle combustion systems, physical absorption, and chemical absorption. The most common of these methods is chemical absorption, which typically uses primary and secondary amines. MEA and DEA are the most common amines used for carbon dioxide capture. These amines bind carbon dioxide at a 2:1 molar ratio. These systems are liquid systems that require large amounts of energy for regeneration and recirculation. Liquid amine systems typically bind 2.5 to 4 mol CO2/kg absorbent at the 2:1 molar ratio. Liquid tertiary amines and amidines have been shown to bind carbon dioxide at a 1:1 molar ratio, thereby reducing the volume of amine, but the binding is much slower. Amine blends have been used to compensate for this difference. In order to reduce regeneration and recirculation costs and increase CO2 binding capacity solid adsorbents are being c

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