Patent ID: 7838454
Filing Date: 2010-11-23
Classification: B01D,B01J,C22B,Y02P

Abstract:
1. A method for desorbing substances from a resin in an apparatus having first and second chambers connected in fluid communication, the method including the steps of: a) supplying a loaded resin having targeted materials and impurities sorbed thereon to the first chamber and the resin moving in a downward direction within the first chamber, wherein impurities having less affinity for the resin than the targeted materials are desorbed from the resin and targeted material can be sorbed onto the resin in the first chamber; b) conveying the resin from the first chamber to the second chamber and moving the resin in an upward direction within the second chamber; c) supplying a desorption solution to the second chamber such that the solution flows downwardly in the second chamber and upwardly in the first chamber in countercurrent flow to the direction of movement of the resin within the first and second chambers; d) discharging stripped resin from the second chamber; e) discharging a first stream of desorption solution containing a high concentration of impurities and a low concentration of targeted substances from the first chamber; and f) discharging a second stream of desorption solution containing a relatively high concentration of targeted material and a relatively low concentration of impurities from a lower region of the first and/or second chambers and/or from the solution being conveyed between the chambers.