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Title: Separation of Carbon Dioxide from Flue Gas Using Ion Pumping

We are developing a new way of separating carbon dioxide from flue gas based on ionic pumping of carbonate ions dissolved in water. Instead of relying on large temperature or pressure changes to remove carbon dioxide from solvent used to absorb it from flue gas, the ion pump increases the concentration of dissolved carbonate ion in solution. This increases the overlying vapor pressure of carbon dioxide gas, which can be removed from the downstream side of the ion pump as a nearly pure gas. This novel approach to increasing the concentration of the extracted gas permits new approaches to treating flue gas. The slightly basic water used as the extraction medium is impervious to trace acid gases that destroy existing solvents, and no pre-separation is necessary. The simple, robust nature of the process lends itself to small separation plants. Although the energy cost of the ion pump is significant, we anticipate that it will be compete favorably with the current 35% energy penalty of chemical stripping systems in use at power plants. There is the distinct possibility that this simple method could be significantly more efficient than existing processes.
Authors:
; ;
Publication Date:
OSTI Identifier:
891065
Report Number(s):
UCRL-CONF-220812
TRN: US200621%%92
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: GHTG-8 International Conference On Greenhous Gas Control Technologies, Trondheim, Norway, Jun 19 - Jun 22, 2006
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; CARBON DIOXIDE; CARBONATES; ENERGY ACCOUNTING; FLUE GAS; GASES; GREENHOUSE GASES; POWER PLANTS; PUMPING; SOLVENTS; VAPOR PRESSURE; WATER