Combined Membrane, Pressure, and Temperature Swing CO2 Separation
Purpose This invention is a more energy efficient process to separate CO2 from flue gas, natural gas, or process gas (e.g. syngas) stream.
Advantages . Combines features of membrane separation, pressure swing, and temperature swing separation into one process that operates continuously . More energy efficient than current technology . Requires less capital investment than existing technology . Can be used for separation of other gas components
Technology Separation of CO2 from flue gas or process gas (e.g., syngas) streams and compression of CO2 to pipeline pressure requires optimization to minimize energy consumption, both thermal and compression. Pressure swing and temperature swing sorption processes and membrane separation have been reported in the literature. Membrane separation is similar to pressure-swing sorption in that the CO2 stream exits at a lower pressure than the feed. For a CO2 separation process to be accepted and implemented, high throughput operations such as power generation and gasification require improved energy efficiency through tight optimization of process variables. Features of membrane, pressure-swing, and temperature-swing separation can be incorporated into the single proposed process to give more flexibility of optimization. Also, the combined process combines absorption and desorption in the same unit so two units are not required.
Applications This invention is meant to be used for CO2 separation in power plants and other industrial facilities.
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