Research Triangle Institute (RTI), in collaboration with its partners, will develop and evaluate an advanced solid sorbent-based CO2 capture process with the potential to substantially reduce the parasitic energy requirement and costs associated with capturing CO2 from coal-fired flue gas compared to conventional aqueous amine CO2 scrubbing. A promising molecular basket sorbent (MBS) from Pennsylvania State University (PSU) will be combined with RTI’s circulating, fluidized, moving-bed reactor (FMBR) process design concept and evaluated at bench scale on simulated coal-fired flue gas to validate the feasibility of the process. The MBS comprises a CO2-philic polymer, polyethyleneimine (PEI), loaded onto high surface area nanoporous materials. The sorbent has shown high CO2 loading capacity and thermal properties that could greatly reduce parasitic power requirements for CO2 capture. The cost-effective circulating FMBR design offers superior gas-solid heat and mass transfer characteristics. Key objectives for this project are the optimization and production scale-up of advanced MBS materials in fluidizable form and the development of an associated fluidized-bed process technology. The data obtained during bench-scale testing of the MBS-based CO2 capture process will be used to prepare a design for a full-scale unit and to conduct technical, economic, and environmental analyses.
The advanced, MBS-based CO2 capture process is anticipated to have reduced parasitic loads and lower capital and operating costs for CO2 capture from coal-fired power plants than conventional technologies, and holds potential to meet the cost and performance goals set by DOE. The development of the MBS-based process also advances the solid sorbent CO2 capture field, and the process engineering and design work will represent important advancements for most solids-based CO2 capture systems.
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