Patent ID: 7604222

Claim:
An apparatus, comprising: an exchange column having a longitudinal axis, an inner wall spaced apart from and surrounding the longitudinal axis, thereby being an interior space between the inner wall and the longitudinal axis; and a dividing wall disposed in the interior space, the dividing wall comprising a first plate having an outer surface and an inner surface opposite the outer surface, a second plate having an exterior surface and an interior surface opposite the exterior surface and spaced apart from the inner surface of the first plate, at least one projection fixedly connected to the inner surface of the first plate and adapted to be spaced apart from the interior surface of the second plate, and at least one another projection fixedly connected to the interior surface of the second plate, said another projection adapted to be spaced apart from the inner surface of the first plate and spaced apart laterally from the at least one projection, the dividing wall dividing the interior space into at least a first longitudinal space adjacent the outer surface of the first plate and a second longitudinal space adjacent the exterior surface of the second plate.