Patent ID: 7300498
Filing Date: 2007-11-27
Classification: B01D,B01J

Abstract:
1. In a method for treatment of an exhaust fluid stream containing a material to be removed, comprising the steps of: a) passing an exhaust stream through a first adsorption bed so as to trap a material to be removed, from the stream, in said first adsorption bed, b) conveying heated inert gas through a second adsorption bed so as to drive off said material that was trapped in said second adsorption bed, c) recovering said material removed from said second adsorption bed, d) reversing connections between the exhaust stream and the inert gas, and said first and second beds, such that the exhaust stream passes through said second bed and the inert gas passes through said first bed, and e) continuously repeating steps (a) through (d), wherein the improvement comprises: f) conveying liquefied inert gas to a one of said first and second beds which is currently receiving the exhaust stream, g) directing inert gas, taken from a same source as said liquefied inert gas, to a one of said first and second beds which is currently receiving the heated inert gas, and h) diverting a portion of the exhaust stream so as to pre-heat the inert gas before the inert gas enters one of said first and second beds, and returning said portion of the exhaust stream to a conduit connected to the one of said first and second beds which is currently receiving the exhaust stream.