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High performance hydrophobic solvent, carbon dioxide capture

United States Patent

9,643,123
May 9, 2017
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
Methods and compositions useful, for example, for physical solvent carbon capture. A method comprising: contacting at least one first composition comprising carbon dioxide with at least one second composition to at least partially dissolve the carbon dioxide of the first composition in the second composition, wherein the second composition comprises at least one siloxane compound which is covalently modified with at least one non-siloxane group comprising at least one heteroatom. Polydimethylsiloxane (PDMS) materials and ethylene-glycol based materials have high carbon dioxide solubility but suffer from various problems. PDMS is hydrophobic but suffers from low selectivity. Ethylene-glycol based systems have good solubility and selectivity, but suffer from high affinity to water. Solvents were developed which keep the desired combinations of properties, and result in a simplified, overall process for carbon dioxide removal from a mixed gas stream.
Nulwala; Hunaid (Pittsburgh, PA), Luebke; David (Bethel Park, PA)
CARNEGIE MELLON UNIVERSITY (Pittsburgh, PA), U.S. DEPARTMENT OF ENERGY (Washington, DC)
14/ 525,011
20150114226
October 27, 2014
FEDERAL FUNDING This invention was made with government support under contract number DE-FE0004000 awarded by the Department of Energy. The government has certain rights in the invention.