Method and apparatus for unloading vapor adsorbers
 The draft forcing fan system in a vapor adsorber is used to extract spent powdered or granular adsorbent from the contacting column by blocking the normal air route intake and discharge ducts. Auxiliary fittings mounted on the intake and discharge ducting facilitate temporary duct connections with a conveniently sized vacuum receiving cannister. In this mode, the fan which forces draft through the adsorption unit operates as a vacuum sweeper. A manually manipulated sweeper wand connected to the vacuum cannister is used to draft the spent adsorbent charge from the contacting chamber into the cannister for removal, regeneration or disposal. 
Westvaco Corporation
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Harry W.
Robertson, IV