Gas separation: processes – Solid sorption – With plural indirect heat transfer steps on solid sorbent or...
Patent
1996-03-15
1997-09-23
Spitzer, Robert
Gas separation: processes
Solid sorption
With plural indirect heat transfer steps on solid sorbent or...
95125, 95126, 96146, 96154, B01D 5304, B01D 5326
Patent
active
056699620
ABSTRACT:
A cyclic process is provided for drying a compressed gas using at least two shell and tube adsorber heat exchangers each having a shell-side passage and a tube-side passage wherein the tubes have an interior surface which is uniformly coated with a solid adsorbent. In the operation of the process, a feed gas at ambient conditions is passed to the shell-side passage of the first adsorber to cool the adsorber and heat the feed gas stream to provide a first exchanged stream. The first exchanged stream is compressed and passed to the shell-side passage of another adsorber heat exchanger to provide a second exchanged stream. The second exchanged stream is returned to the tube-side passage of the first adsorber heat exchanger wherein the second exchanged stream is contacted with the adsorbent to adsorb moisture and thereby produce a dry compressed gas stream. A portion of the dry compressed gas stream is employed to purge the tube-side passage of other adsorber heat exchangers. The position of the first and other adsorber heat exchanger is interchanged in a cyclic process to produce the dry compressed gas. The interchanging of the adsorber heat exchangers is cycled rapidly to provide dry compressed gas for truck or locomotive brake systems and shop air supplies which have significantly lower adsorbent mass requirements and use significantly less purge gas than conventional pressure swing adsorption dryers.
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Lukchis, George M., "Adsorption Systems: Part II," Chemical Engineering Magazine, Jul. 9, 1993, p. 83.
McBride Thomas K.
Silverman Richard P.
Spitzer Robert
Tolomei John G.
UOP
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