Aminosilicone systems for post-combustion CO2 capture

Gas-liquid membrane contactors for carbon dioxide separation: A review

“…The lack of an aqueous phase and their high boiling points of over 250 ºC, means that latent heats of evaporation are minimised, reducing the regeneration energy demand [70,71]. For example, polydimethylsiloxanes (PDMS) functionalised with side chain amine groups present low vapor pressure and high thermal stability with high CO2 solubility [72]. Structural variation of these aminosilicones has been investigated to potentially improve the CO2 absorption capability, with both CO2-philic backbones and CO2-reactive functional groups for both physisorption and chemisorption [71].…”

“…The use of relatively high CO2 absorption and desorption temperatures is also advantageous for improving process efficiency. Some aminosilicones, such as 1,3-Bis(3-aminopropyl)-1,1,3,3-tetramethyldsiloxane undergo a reversible phase change from liquid to solid as the carbamate salt forms during CO2 absorption [72][73][74]. As with the precipitating potassium carbonate system, a significant advantage in this case is that only the solid needs to be processed through the regeneration system.…”

“…As with the precipitating potassium carbonate system, a significant advantage in this case is that only the solid needs to be processed through the regeneration system. This reduces both the size and energy demand from this regeneration step [72].…”