Pressure and temperature swing adsorption and temperature swing adsorption

摘要

PCT No. PCT/GB95/02623 Sec. 371 Date Apr. 28, 1997 Sec. 102(e) Date Apr. 28, 1997 PCT Filed Nov. 10, 1995 PCT Pub. No. WO96/14916 PCT Pub. Date May 23, 1996A method is provided for separating one or more volatile contaminant components from a gas using a pressure and temperature swing adsorbent filtration filter bed system containing three or more layers of adsorbent materials characterized in that the layers comprise a first layer of adsorbent material, a second layer of dessicant material and a third layer of material capable of adsorbing contaminants that are not retained by the first layer. Preferably the third layer is capable of adsorbing contaminants of relatively low boiling point, e.g. of boiling point less than 50 DEG C., and preferably comprises a microporous adsorbent. The second layer of dessicant material preferably comprises a zeolite.