L21A - common • Adsorber design-Choice of adsorbent- Bed...

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LECTURE 21 ADSORPTION A separation process to remove a solute from a fluid phase by putting the solute on a solid surface . Fluid + Solute Adsorbent Clean fluid Adsorption is a surface process. Absorption is a bulk process. •Examples ±: Organic gases + Air clean air Water + Organic pollutants clean water Gas Drying Gas + Water Dry gas N 2 + O 2 O 2 (Pressure Swing Adsorption) (Activated Carbon bed) (Activated Carbon bed) Silica gel, alumina
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Modes Of Operation 1. Batch Process Inject fluid stream for a certain time. At some point, the bed is saturated with solute. Does not adsorb anymore. Stop and put in a new bed. Mostly in non-industrial use 2. Semi – Continuous Usually 2 beds. Inject into one until its saturated. Switch to the 2 nd one, while the 1 st one gets regenerated. Go back and forth. Ex: Pressure – Swing Adsorption for dehydration of air 21 0 c Coalescing filter Compressor Cooler Dry air Pressure 6atm 1.5atm Moist air ~6atm Purge Adsorber 1 Adsorber 2 Purifying filter
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3. Continuous Fluidized bed, part of the solid is removed, desorbed and fed back to the original bed. Not very
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Unformatted text preview: common • Adsorber design-Choice of adsorbent- Bed area- Bed length- Cycle time Other Similar processes 1. Ion – Exchange To remove an ion from a liquid phase by exchanging with another ion on a solid (resin) phase. Ex: Removing Ca ++ from hard water Ca ++ (aq) + 2Na (s) R ↔ CaR 2(s) + 2Na + (aq) Also used for - Recovery of uranium from acid leach solution- Recovery of antibiotics, vitamins from fermentation broths 2. Chromatography To separate 2 similar solutes from each other in a mobile phase Column w/a stationary phase Mobile phase with a pulse of A&B Detector •Used in analysis •Used in preparative mode •Very common in biotechnology •Gas chromatography •Liquid chromatography •HPLC, MPLC, LPLC (HP – high pressure, MP – Medium pressure, LP – Low pressure) Missing Material...
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This note was uploaded on 04/15/2008 for the course CHEE 3462 taught by Professor Mohanty during the Spring '07 term at University of Houston.

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L21A - common • Adsorber design-Choice of adsorbent- Bed...

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