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Title: Evaluating the energy performance of a hybrid membrane-solvent process for flue gas carbon dioxide capture

In this study, a particularly energy intensive step in the conventional amine absorption process to remove carbon dioxide is solvent regeneration using a steam stripping column. An attractive alternative to reduce the energy requirement is gas pressurized stripping, in which a high pressure noncondensable gas is used to strip CO 2 off the rich solvent stream. The gas pressurized stripping column product, having CO 2 at high concentration and high partial pressure, can then be regenerated readily using membrane separation. In this study, we performed an energetic analysis in the form of total equivalent work and found that, for capturing CO 2 from flue gas, this hybrid stripping process consumes 49% less energy compared to the base case conventional MEA absorption/steam stripping process. We also found the amount of membrane required in this process is much less than required for direct CO 2 capture from the flue gas: approximately 100-fold less than a previously published two-stage cross-flow scheme, mostly due to the more favorable pressure ratio and CO 2 concentration. There does exist a trade-off between energy consumption and required membrane area that is most strongly affected by the gas pressurized stripper operating pressure. While initial analysis looks promising frommore » both an energy requirement and membrane unit capital cost, the viability of this hybrid process depends on the availability of advanced, next generation gas separation membranes to perform the stripping gas regeneration.« less
 [1] ;  [2] ;  [3] ;  [4] ;  [2]
  1. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); AECOM Corp., Pittsburgh, PA (United States)
  2. Carbon Capture Scientific LLC, South Park, PA (United States)
  3. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
  4. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States); LumiShield Technologies, Inc., Pittsburgh, PA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0888-5885
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 55; Journal Issue: 43; Journal ID: ISSN 0888-5885
American Chemical Society (ACS)
Research Org:
National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
Sponsoring Org:
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; gas pressurized stripping; membrane; CO2 absorption; amine solvent
OSTI Identifier: