Патент №wo/2011/130809 Fractionation of ions from aqueous solutions by electrodialysis using monovalent selective membranes

The present invention relates generally to separation and purification of aqueous solutions and, more particularly, to a system and method for selective fractionation of ions with different charge (at any pH value) and/or size and the use of such for enrichment of ions, particular valuable ions, from industrial streams by novel electrodialysis, as well as for the enrichment and fractionation of organic compounds, proteins, colloids, isomers, or other charged particles. The separation is carried out by means of electrodialysis involving ion exchange membranes (CM, AM) and membranes selective for multivalent anions (MVA) or cations.

Патент №de07104894 Electrodialysis Apparatus and Electrodialysis Method Using the Same

Provided are an electrodialysis apparatus (1) for preparing PCR samples and an electrodialysis method using the same. The electrodialysis apparatus (1) comprises an insertable sample chamber (100); a first dialysis membrane (110) and a second dialysis membrane (120); an anode chamber (210) including an anode (211), wherein the first dialysis membrane (110) separates the anode chamber (210) and the sample chamber (100); and a cathode chamber (220) including a cathode (221), wherein the second dialysis membrane (120) separates the cathode chamber (220) and the sample chamber (100). In particular, when a voltage is applied to the anode (211) and the cathode (221), ionic materials of the sample move towards the anode (211) and cathode (221). The electrode chambers can be agitated by means of supplied gas (262).

Патент № WO/2011/146558 Systems and techniques for electrodialysis Electrochemical separation devices are configured for lower energy consumption. Techniques for reducing shadow effect may involve providing distance between a spacer screen and an adjacent ion-selective membrane. A spacer having a screen that is thin relative to a surrounding frame may be used. Mild pressure may also be applied to a compartment to promote distance between a spacer screen and an adjacent ion-selective membrane.

Патент №us86202338 Regulation process of an electrodialysis device, and electrodialysis installation

The invention relates to a method and a regulating device of an electrodialyser, in particular metal cyanide bath, of the type comprising a stack of ion exchange membranes (2, 3) placed in an electric field. The regulation of the electrodialysis is carried out by taking a sample of the diluted solution to the corresponding output (6), by measuring in a cell (12) the content of a predetermined ionic species of this sample, in particular free cyanide content, and controlling, through a unit (14), a pump (15) as a function of the content, so as to add to the input (5) of the electrodialysis a solution containing ionic species referred to above (free cyanide) in a quantity inverse function of the measured content. The method of the invention allows to eliminate the phenomena of blocking and electrodialysis membrane fouling.