High-pressure electrodialysis device

An apparatus for performing electrodialysis at pressures greater than or equal to the ambient pressure is described. The apparatus includes an electrodialysis membrane stack (101) and housing. The electrodialysis membrane stack includes at least one electrodialysis cell (102). The electrodialysis apparatus includes electrodes that apply voltage across the electrodialysis stack. The housing pressurizes the electrodialysis stack at a stack pressure. The housing includes a cell chamber that receives the electrodialysis stack, the cell chamber including at least one pressurization port communicating with the cell chamber such that a portion of electrode solution is transmittable into a region of the cell chamber outside the electrodialysis stack. A system for performing electrodialysis at pressures greater than ambient pressure includes at least two solution loops, an electrode solution loop, and an electrodialysis apparatus operatively connected to the solution and electrode solution loops that performs electrodialysis at a stack pressure that is greater than ambient pressure.