428617 Anti-Foaming Study for Physical Solvents for Pre-Combustion CO2 Capture

Monday, November 9, 2015: 1:33 PM
250E (Salt Palace Convention Center)
Fan Shi1,2, Jeffrey Culp2,3, Nicholas Siefert1 and David Hopkinson4, (1)National Energy Technology Laboratory, Pittsburgh, PA, (2)AECOM, South Park, PA, (3)U.S. Department of Energy, National Energy Technology Laboratory, Pittsburgh, PA, (4)U.S. Department of Energy, National Energy Technology Laboratory, Morgantown, WV

The pre-combustion capture process involves converting fossil fuel into syngas, primarily a mixture of carbon monoxide and hydrogen, usually by gasification. During pre-combustion, coal is first transformed into hydrogen and CO2. In a CO2 separation unit, the carbon dioxide is separated from the hydrogen using a physical solvent, such as commercial Selexol solvent. This process has the potential of capturing and removing 90 percent of CO2emissions from power plants - major contributors to global warming.

We previously explore the use of hydrophobic physical solvent, hybrid-PDMS, for pre-combustion carbon capture.   Solvent showed compatible CO2 solubility to Selexol at different operating conditions. However, foaming issue prevent its use for pre-combustion carbon capture.    To solvent this problem, we investigated adding a none-volatile ionic liquid, allyl pyridinum Tf2N, in hybrid-PDMS. A 1-liter Continuous Stirred Tank Reactor (CSTR) equipped with a 2-liter gas buffer tank has been used to measure CO2, H2, and CH4isotherms at different temperatures. For gas solubility measurement, a dynamic pressure-step method was applied.

This study has established an understanding of the influence of second non-volatile solvent on hybrid-PDMS solvent physiochemical properties, including foaming, gas solubility, CO2 selectivity, viscosity, and so on.

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