CO2 Capture – Gas Treatment with Lipophilic Amines

An innovative method for the separation of CO2 from gases, e.g. flue or synthesis gas, by chemisorption using an aqueous solution of mixed lipophilic amines, such as

N,N- Dimethylcyclohexylamine (DMC). The amine solution loaded with CO2 is regenerated with the help of a temperature induced thermomorphic liquid-liquid-phase separation at moderate temperatures lying well below 100°C. The amines partition into a distinct organic phase, while the CO2 initially remains in the aqueous phase as HCO3- from which it is then liberated and recovered as a gas. Commercial Opportunities: Since the dissociation of the amines from CO2 is brought about by the liquid-liquid miscibility gap, the solvent regeneration operates at much lower temperatures than in conventional CO2-capture processes and can thus be tailored to utilize previously unexploited waste heat sources. The low heat of reaction and dispensing with stripping steam leads to an extremely energy-efficient process for CO2 capture from industrial gases comparable with or superior to the best state-of-the-art technologies. Further advantages include the excellent CO2 absorption kinetics and the improved resistance to oxidative degradation.

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Dipl.-Ing. Alfred Schillert