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Process for CO2 Capture Using Zeolites from High Pressure and Moderate Temperature Gas Streams

National Energy Technology Laboratory

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Technology Marketing Summary

Research is currently active on the patented technology "Process for CO2Capture Using Zeolites from High Pressure and Moderate Temperature Gas Streams." The technology is available for licensing and/or further collaborative research from the U.S. Department of Energy’s National Energy Technology Laboratory.


This invention discloses a method for separating COfrom a high-pressure and moderate- temperature gas stream composed of COand other gaseous constituents using a zeolite sorbent in a temperature-swing adsorption process, which produces a COstream at a high CO2pressure contributing to low compression costs for COsequestration. The method also uses COdesorption in a COatmosphere and effectively integrates heat transfer to optimize overall efficiency. Current commercial processes for COremoval from high-pressure gas streams require gas cooling to ambient temperatures contributing to lower thermal efficiencies of the process. The overall efficiency of the COremoval process in the invention disclosure is higher than that of the com-mercial processes since the COremoval process takes place at moderate temperatures and COcan be recovered at high pressure. Presence of moisture in the gas stream does not affect the CO2sorption/desorption process of the zeolites at the reaction conditions used in the process.

The emission of COfrom power plants has been identified as a potential factor in long-term environmental problems. As a result, the separation of COfrom gaseous streams by using adsorption of gases and vapors by micro-porous solids has attracted industry attention due to its importance in the fields of gas separation and gas purification. Therefore, technologies based on COadsorption/desorption that use natural and synthetic zeolites are among the most effective methods.

Researchers have generally used two methods for CO2adsorption/desorption that apply zeolite adsorbents for COseparation: temperature-swing adsorp-tion and pressure-swing adsorption. However, at lower pressures, the COadsorption capacity of zeolites generally diminish rapidly as the tempera-ture of the gas being separated increases. In addition, moisture sorption contributes to decreasing COcapture capacities during multiple cycles.

Therefore, researchers needed a method to address these issues if zeolites are to be used in the COcapture process. This invention does just that by providing a method of COseparation by using zeolite adsorbents in a manner that preserves adsorption capacities at higher temperatures, recovering COat high pressure and addressing the moisture issue.

  • Provides an effective method for separating CO2 from a gas stream
  • Uses a zeolite sorbent in a temperature swing adsorption process
  • Preserves adsorption capacity at higher temperatures
Applications and Industries
  • Fossil-fueled power systems  
  • Natural gas treatment 
  • Hydrocarbon purification 
  • Hydrogen gas production
More Information

U.S. Patent No. 8,128,735, titled "Process for COCapture Using Zeolites from High Pressure and Moderate Temperature Gas Streams."

Inventors: Ranjani V. Siriwardane and Robert W. Stevens, Jr.

Technology Status
Development StageAvailabilityPublishedLast Updated

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To: Jessica Lamp<>