Pressure Swing Adsorption - PowerPoint PPT Presentation

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Pressure Swing Adsorption

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  1. Pressure Swing Adsorption Group 6 Ryan Hummel, Mike DeGuzman, David Vuong, and Miyoko Ohashi

  2. What is Pressure Swing Adsorption? • Requires a selective adsorbent • Usually binary separation • Not a continuous process

  3. Skarstrom Cycle • Published in 1959 • Two beds, four steps • Difference in purity • Improvements on the cycle

  4. General Equations • Assumptions -process is considered an adiabatic system -gas flow rate is affected by bed height and time -pressure drop can be ignored -negligible mass transfer between gas phase and solid phase

  5. -Mass balances -Energy balances -Linear driving force model is adopted as the mass transfer equation

  6. Four cycle process

  7. PSA unit on the steam reformer supplied to Hickson & Welch, Castleford, England • Hydrogen purification system

  8. Linde AG, Linde Gas Division, Germany • Hydrogen purification system • Process • capacity

  9. Other methods used for gas separation include: Cryogenics Noncryogenics Competing Methods to PSA

  10. Cryogenics: Operated under low temperature. (T = 100K – 150K) This involves liquid to separate gas Both temperature and pressure are controlled. Difference between boiling points is utilized. (Extremely low temperature is necessary for the separation of gases such as air.   Cryogenics

  11. Low temperature achieved by: evaporation of highly volatile liquids or expansion of gases under low pressure Cryogenics

  12. Vacuum Swing Adsorption (VSA) Lower pressure than PSA (to the vacuum level) Vacuum is used to evacuate after the product gas is adsorbed. Recovery of methane from coal mine methane gas. Nitrogen and oxygen were removed 96-98% from the methane-rich gas. High purification level Quick Regeneration cycle takes seconds. Noncryogenics (Swing Adsorption)

  13. Temperature Swing Adsorption (TSA) High temperature let the gas to escape. One cycle takes hours lots of adsorbents are necessary. If combined with PSA  Pressure Temperature Swing Adsorption (PTSA) Noncryogenics (Swing Adsorption)

  14. Solvent Absorption: Liquid absorbs the desired gas selectively. common in soda manufacturing. Membrane Separation: membrane diffusion  uses different velocity of gas molecules. inexpensive method Other Noncryogenics Product not very pure  not good for most industrial uses

  15. Methods contribute to: air separation collection of potentially useful gases (carbon dioxide and hydrogen). Removing harmful gases (VOCs (volatile organic compounds), CO2, NOX, or SO2). PSA – gas separation process

  16. The End