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Organoclay Sorbent for Removal of Carbon Dioxide from Gas Streams at Low Temperatures

National Energy Technology Laboratory

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Technology Marketing Summary
By incorporating amines inside clay containing quaternary ammonium salts (organoclay) minerals, this invention has created a way to prepare sorbents that capture carbon dioxide (CO2) from low temperature and low pressure gas streams. In this process, the clay minerals are modified with organic materials to retain the amines.

NETL researchers had earlier prepared a sorbent that had incorporated amines and/or polar liquids in a clay matrix. However, the researchers found during long-term tests when the regenerations are conducted at 1000 C that a small amount of liquid was lost from the sorbent. To solve the problem, the researchers modified the clay by exchanging the sodium or calcium ions using quaternary ammonium salts containing organic molecules to improve the interaction between the amines and the clay. The modified clay materials improved the retention of the amines and stabilized reactivity processes.

New developments in a sorbent process are important because an improvement in the separation and capture of CO2 will reduce the total cost required for sequestration, an area of research identified as a high priority for the U.S. Department of Energy. The costs of separation and capture are estimated to compose about three-fourths of the total cost of geologic or ocean sequestration.

Currently, CO2 absorption processes, often called wet chemical stripping, and solid sorbent processes have both been used to remove CO2 in gas streams. Recently, several solid processes have been used but they tended to lose their ability to absorb CO2 over numerous cycles due to loss of amine. This new invention solves that problem by improving the retention capability of the amines.

• Energy mixing is maximized
• Mobilizing of the particulates is complete
• No “dead zones” exist
• Packing of material is minimized
• Eroding effects are significantly reduced
Applications and Industries
  • Mixing nuclear waste at Hanford
  • Any similar industrial process involving heavy solids in a carrier fluid
Technology Status
Development StageAvailabilityPublishedLast Updated

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