Improved Pelletized Immobilized Amine Sorbents for CO2 Capture

Improved Pelletized Immobilized Amine Sorbents for CO₂ Capture

Fri, 05/01/2020 - 12:00

USPN 10,065,174; USPN 10,603,654;

Opportunity

This invention describes basic immobilized amine sorbents (BIAS) with improved pelletization process and formulation for use in CO₂ capture processes. This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory.

Challenge
BIAS sorbents demonstrate high CO₂ capture capacity and thermal stability over multiple steam regeneration cycles and represent a promising approach for CO₂ removal from a variety of source points, including coal and natural gas combustion power plants. Bench- and pilot-scale testing have demonstrated the feasibility of commercial-scale BIAS sorbents. However, full commercialization of BIAS sorbents requires pelletization. Commercially available silica typically serves as the support for amine-based particle sorbents, yet these materials are not commercially feasible due to their relatively low mechanical strength and difficult management in dynamic reactor systems. Thus, the development of an economical method of fabricating a strong silica-supported BIAS pellet is a primary concern.

Overview

This technology describes a method to generate pelletized BIAS sorbents using low-cost inorganic binders, such as fly ash and polymer binders as well as with polychloroprene latex. The technology also describes using a novel cross linker and antioxidant during pellet functionalization. The process generates low-cost amine-based sorbents with high mechanical strength, high CO₂ capture capacity, and long-term CO₂ capture stability. The pelletized sorbents can be used for packed bed, moving bed and other reactor configurations. The pellets can also be used under both pressure and temperature swing conditions.

Advantages

Demonstrates high mechanical strength and CO₂ capture capacity.
Provides an economical alternative for pelletization of amine-based sorbents.
Offers a scalable pelletization process.
Has the potential for greater CO₂ capture stability in the presence of water vapor and oxygen.

Applications

Any facility or system from which CO₂ capture is desired could benefit from this technology. These sources may include coal and natural gas combustion power plants, Marcellus shale gas cleanup, cement production plants, confined spaces such as submarines and space shuttles/stations, landfills and aerobic digesters for biogas cleaning and waste incineration units.

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