Patent ID: 7449093

Claim:
Method for the membrane electrophoresis of substances which are dissolved or dispersed in electrolyte-containing solution using an at least quadrupartite separation chamber ( 7 ) which comprises at least one pair of diluate spaces ( 16 ) and concentrate spaces ( 17 ), a cathode space ( 18 ) and an anode space ( 21 ) having electrodes as anode ( 19 ) and cathode ( 20 ), the diluate spaces and concentrate spaces of each pair being separated from each other by ultrafiltration or microfiltration membranes ( 15 ); the cathode space and anode space being separated from the pairs of diluate and concentrate spaces by restriction membranes and each pair of diluate and concentrate spaces, if there be more than one, being separated from the others by restriction membranes, said separation chamber also comprising an electrode rinsing solution being circulated through the electrode spaces ( 18 , 21 ), and, diluate being continuously conducted through the diluate space ( 16 ), and, respectively, a concentrate being continuously conducted through the concentrate space ( 17 ), wherein at least one substance which is dissolved or dispersed in the diluate is transferred electrophoretically, by means of an electrical field which is applied between the anode ( 19 ) and the cathode ( 20 ), from the diluate space ( 16 ) to the concentrate space ( 17 ), with a pressure difference of at least 3 kPa being maintained between the diluate space ( 16 ) and the concentrate space ( 17 ) of each pair of diluate spaces and concentrate spaces.