CO2-to-carbonate sequestration using membrane capture plus catalytic carbonic-acid formation enables solid, storable CO2 removal.
It captures CO2 from a gas using a gas-diffusion membrane, then converts the CO2 in a catalyst-containing fluid to carbonic acid and finally precipitates carbonate salts by adding mineral ions. The process produces a solid carbonate precipitate suitable for long-term storage, avoiding continuous solvent handling and enabling stable sequestration. Before this patent expired on 2023-05-02, building comparable membrane-catalyst-carbonate precipitation systems likely required licensing from the assignee.
Launch modular post-combustion CO2 capture units that convert flue-gas CO2 into merchantable carbonate solids for onsite disposal.
A process for selectively removing carbon dioxide from a gaseous stream by converting the carbon dioxide to a solid, stable form is provided. In a sequestration process, carbon dioxide enriched air is passed through a gas diffusion membrane to transfer the carbon dioxide to a fluid medium. The carbon dioxide rich fluid is then passed through a matrix containing a catalyst specific for carbon dioxide, which accelerates the conversion of the carbon dioxide to carbonic acid. In the final step, a mineral ion is added to the reaction so that a precipitate of carbonate salt is formed. This solid mineral precipitate can be safely stored for extended periods of time, such as by burying the precipitate in the ground or depositing the precipitate into storage sites either on land or into a body of water. An apparatus for removing carbon dioxide from a gaseous stream is also provided.
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