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Pelletized Basic Amine Sorbents Using Fly Ash and Polymer Binders

Date Posted
USPN 10,065,174; USPN 8,834,822; USPN 8,500,854

Opportunity

Research is active on the development of basic immobilized amine sorbents for use in CO2 captures processes. These inventions are available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory.

Overview

Basic immobilized amine sorbents (BIAS) represent a promising approach for CO2 removal from a variety of source points including coal and natural gas combustion power plants. Basic immobilized amine-based sorbents demonstrate high CO2 capture capacity and thermal stability over multiply steam regeneration cycles. Bench- and pilot-scale testing have demonstrated the feasibility of BIAS sorbents to commercial scale. However, for the full development of BIAS sorbents to commercial scale, pelletization is required. Commercially available materials such as silica, for use in the pelletization of powder amine sorbents are not commercially feasible due to their relatively low mechanical strength and difficult management in dynamic reactor systems.

This invention describes a method to generate pelletized BIAS sorbents using low cost inorganic binders, such as fly ash, and polymer binders including poly (chloroprene) (chlorinated rubber). 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.

Significance
  • BIAS pellets demonstrate high mechanical strength and CO2 capture capacity
  • Method provides an economical alternative for pelletization of amine-based sorbents
  • Scalable pelletization process
  • Potentially greater CO2 capture stability in the presence of water vapor
Applications

Any facility or system from which CO2 capture is desired. 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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