Patent ID: 7691264
Filing Date: 2010-04-06
Classification: B01D

Abstract:
1. A semi-permeable membrane system for transferring a magnetic particle fraction contained in a first fluid, to a second fluid comprising: a) a membrane ( b) means for alternately generating a pressure differential between the two fluids at opposite sides of the membrane ( c) means for generating a magnetic field in said at least one passage, said magnetic field generating means being switchable for establishing the magnetic field during fluid flow in one direction and eliminating the magnetic field during fluid flow in the opposite direction, d) the switching positions being changeable cyclically between a first on position wherein the magnetic field is switched on and the magnetic particles are not carried along with the fluid flow in the membrane and a second off position in which the magnetic field is switched off and the magnetic particles are moved with the fluid flow thereby moving the magnetic particles stepwise through the membrane from the first fluid to the second fluid.