Organic Liquid CO2 Capture Agents With High Gravimetric CO2 Capacity
Mixtures of organic alcohols and amidine / guanidine bases reversibly bind CO2 chemically as liquid amidinium / guanidinium alkylcarbonates. The energy of CO2 binding in these organic systems was found to be very small, no more than 11 kcal/mol for all alcohols and bases tested. These systems require no solvent to remain liquid when CO2 is bound, therefore having high CO2 capacities, up to 19%. The rate of CO2 uptake and release by these organic systems is limited by dissolution of CO2¬ in and out of the liquid phase. Gas absorption is highly selective for CO2 in both concentrated and dilute gas streams. These organic systems have been shown to bind and release CO2 for five cycles without losing activity or selectivity. We now report a new class of CO2 binding organic liquids that chemically capture and release CO2 much more efficiently than aqueous alkanolamine systems.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 958503
- Report Number(s):
- PNNL-SA-60661; TRN: US201002%%64
- Journal Information:
- Energy & Environmental Science, 1(4):487-493, Vol. 1, Issue 4
- Country of Publication:
- United States
- Language:
- English
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