Patent ID: 9669361
Date: 2017-06-06
CPC Classifications: B01D,C23C,C25D

Claim:
1. An electrodialysis device for the regeneration of an electroless plating bath, comprising at least one anode and at least one cathode, at least one first partial electrodialysis device, said at least one first partial electrodialysis device arranged between said at least one anode and said at least one cathode, said at least one first partial electrodialysis device including a membrane electrolysis stack, said membrane electrolysis stack comprising a plurality of membranes and electrolyte compartments arranged between the membranes, said plurality of membranes including at least one first membrane and at least one second membrane with first membranes and second membranes alternating in succession in the membrane electrolysis stack, at least one of the first membranes being an anion exchange membrane, and said first membranes otherwise being selected from the group consisting of anion exchange membranes and bipolar membranes, and every second membrane being selected from the group consisting of monoselective anion exchange membranes, monoselective cation exchange membranes, and proton-selective exchange membranes, each first membrane and the second membrane immediately succeeding each first membrane in the membrane electrolysis stack being selected independently of each other, at least one second partial electrodialysis device, said at least one second partial electrodialysis device arranged between said at least one anode and said at least one cathode, said at least one second partial electrodialysis device including a membrane electrolysis stack, said membrane electrolysis stack comprising a plurality of membranes and electrolyte compartments arranged between the membranes, said plurality of membranes including at least one first membrane and at least one second membrane with first membranes and second membranes alternating in succession in the membrane electrolysis stack, at least one of the first membranes being a bipolar membrane, and first membranes otherwise being selected from the group consisting of anion exchange membranes and bipolar membranes, and every second membrane being selected from the group consisting of monoselective anion exchange membranes, monoselective cation exchange membranes, and proton-selective exchange membranes, each first membrane and the second membrane immediately succeeding each first membrane in the membrane electrolysis stack being selected independently of each other, said first and said second partial electrodialysis devices each including electrolyte diluate compartments located on the cathode side to the at least one first membranes, said diluate compartments being adapted to contain the electrolyte to be regenerated, and electrolyte concentrate compartments located on the cathode side to the at least one second membranes, the concentrate compartments being adapted to contain a concentrate liquid, wherein the concentrate compartments are adapted to receive concentrate liquid containing interfering ions taken up from the electrolyte to be regenerated, wherein the diluate compartments of said first partial electrodialysis device are hydraulically connected to the dilute compartments of second partial electrodialysis devices, and wherein the concentrate compartments of said first partial electrodialysis device are hydraulically connected to the concentrate compartments of second partial electrodialysis devices.