Separating CO2 from Air: Chemical Methods and Techniques

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SUMMARY

The discussion focuses on effective chemical methods for separating CO2 from air using alkaline substances such as sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide (Ca(OH)2). These compounds react with CO2 to form bicarbonates or carbonates, while remaining inert to nitrogen (N2), oxygen (O2), and argon (Ar). The process involves drying the carbonates in an oven to eliminate moisture, followed by heating to decompose them back into CO2.

PREREQUISITES
  • Understanding of chemical reactions involving alkaline substances
  • Knowledge of carbonate and bicarbonate chemistry
  • Familiarity with thermal decomposition processes
  • Basic laboratory skills for handling chemicals safely
NEXT STEPS
  • Research the properties and reactions of sodium hydroxide (NaOH) in CO2 capture
  • Explore the thermal decomposition of calcium carbonate (CaCO3)
  • Investigate industrial applications of CO2 separation techniques
  • Learn about alternative methods for carbon capture and storage (CCS)
USEFUL FOR

Chemists, environmental scientists, and engineers focused on carbon capture technologies and air quality improvement will benefit from this discussion.

The riddler
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Basically anyway to do the question above.

Thanks for any replies
 
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Use something like NaOH, KOH, Ca(OH)2. These will react with the CO2 in the air to give the corresponding bicarbonates/carbonates. They won't react with N2, O2, or Ar. Then dry the carbonates in an oven to get rid of the water and then heat them up to decompose them into CO2.
 

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