How does an adsorbent gas dryer bed work? Looking for detailed technical info.?

The purpose of any adsorbent bed is to remove a compound(s) from a liquid or gas. Typically, you are attempting to remove an impurity. Exactly how, chemically or physically, a adsorbent gas dryer bed works depends on the impurities that an operator is attempting to remove. A summary of how coal fired power plants remove impurities can be found at http://www.icac.com/i4a/pages/index.cfm?pageid=3401 Basically, a stream of gas (like air) passes the adsorpent bed which is filled with some type of adsorbent material. There are numerous types of material but the one to use depends the specific situation. The packing material can also be stationary/fixed or it can move around. The material in the bed must also have a high surface area to contact the incoming gas/liquid stream. (For example, an ounce of sand has a much higher surface area than a one ounce marble.) The surface of the adsorbent material reacts with the impurities to either immobilize the impurity by having it stick to the surface or undergo a chemical reaction to create a new material that is easier to remove. For example, sulfur dioxide can be removed for the air by reacting it with limestone converting it into a solid (calcium sulfate (gypsum) or calcium sulfite). For detailed info, I would need to know what the application of your gas dryer bed is in order to point you in a more specific direction. Other keywords to look up: Scrubbers, packed bed, packed bed reactors

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