268070 Process Development for Phase-Changing Aminosilicone-Based CO2-Capture Absorbents

Wednesday, October 31, 2012: 3:35 PM
336 (Convention Center )
Tiffany Westendorf1, Benjamin R. Wood1, Sarah Genovese1, Irina Sultanova1, Robert J. Perry1, Rachel Farnum1, Michael J. O'Brien1, Malgorzata Rubinsztajn1, Ravi-Kumar Vipperla2 and Robert Enick3, (1)Global Research, General Electric, Niskayuna, NY, (2)GE Energy, Greenville, SC, (3)University of Pittsburgh, Department of Chemical and Petroleum Engineering, Pittsburgh, PA

Liquid aminosilicone-based absorbents have been developed that have the potential to significantly reduce the cost of CO2 capture from pulverized coal power plants.  Upon exposure to CO2, these novel absorbents solidify, thereby enabling innovation in CO2 capture process design.  Compared to MEA-based CO2 capture absorbents, the phase-changing aminosilicones have the potential to reduce CO2 capture cost through higher CO2 absorption capacity, greater thermal stability, and reduced solvent losses due to volatility.  Furthermore, the phase-changing behavior of these new absorbents and the absence of aqueous diluent enable the use of more energy-efficient separations process units.  Finally, by enabling pressurized desorption of CO2, the energy required to compress the clean CO2 stream pre-sequestration is significantly reduced. 

A process is being developed in which CO2 is removed from simulated flue gas in a spray absorber, and the solid CO2-sorbent complex is slurried in liquid absorbent for transport to a pressurized desorber.  In the desorber, the solids are heated to release CO2 and regenerate the liquid absorbent for recycle.  Experiments at the lab scale focusing on spray absorption, slurry rheology, and pressurized desorption are in progress to generate data needed to scale up the process.  These results and their effect on estimated CO2 capture economics will be discussed.

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See more of this Session: CO2 Capture, Control and Sequestration III
See more of this Group/Topical: Sustainable Engineering Forum