It is possible to capture low pressure (partial pressure ~0.15 - 1 atm) CO2 in the form of a dry, friable powder by reacting CO2 with a mist of aminosilicone droplets composed of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane. These mists are readily generated with conventional spray drying equipment that employs either hydraulic nozzles or gas-atomizing nozzles. CO2 is introduced to the spray chamber co-currently with the downward-flowing aminosilicone spray, and the droplets rapidly transform into solid particles within several cm of the nozzle tip. The powder is collected via gravity settling within the spray drying chamber and with a cyclone separator at the chamber exit. Particle size analysis, desorption isotherms (generated using two techniques), TGA-MS results and DSC analysis of the powder will also be presented.

Post-combustion CO2 capture using phase-changing solvents in a spray dryer: Changing aminosilicone liquids into carbamate salt powders

243rd National Meeting (2012)

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