Oxygen Generator-Presentation

Pressurized air is passed through the membrane and is

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Unformatted text preview: aracteristics of each component in relation to the membrane. Membranes Drawbacks Membranes require a large surface area to achieve high product flow rates. Large pressures are typically used – Safety hazard – Large compressors Oxygen and Argon molecules are similar in size and have similar permeability properties. – This results in a selectivity of ≈2.5 O2/Ar and a low oxygen recovery. Pressure Swing Adsorption Pressure Swing Adsorption Uses sorbents (zeolites, nanotubes) in two adsorption columns to separate molecules. Two columns allow for the process to operate semicontinuously. 4 Process stages – Adsorption/Production – Blowdown/Purge Pressure Swing Adsorption Stage 1 Compressed air is fed into the first bed. Nitrogen and argon molecules are trapped, while oxygen is allowed to flow through. Pressure Swing Adsorption Stage 2 The adsorbent in the first bed becomes saturated with nitrogen and argon molecules The airflow feed is directed into the second bed. Pressure Swing Adsorption Stage 3 The adsorbent adsorbs nitrogen and argon in the second be...
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