Abstract: A process is disclosed for maintaining or increasing electrolyte flow rate through a microporous diaphragm in an electrochemical cell for the production of hydrogen peroxide by maintaining in the electrolyte a sufficient concentration of a stabilizing agent. Flow rate is maintained or increased by complexing transition metal ions or compounds with the stabilizing agent.

Abstract: Novel methods of decreasing the concentration of hydroxyl ions in an electrochemically generated alkaline peroxide aqueous solution consisting of partial neutralization of a stabilized solution of alkaline hydrogen peroxide, electrodialysis, and dialysis of an aqueous solution of alkaline hydrogen peroxide. The methods of the invention can be performed at ambient temperature and pressure.

Abstract: A bipolar, filter press type cell is disclosed having a liquid permeable diaphragm which is particularly suited for the electrolysis of a brine solution to produce chlorine and caustic or the electrolysis of an aqueous alkali metal hydroxide to produce an aqueous alkaline hydrogen peroxide solution. The cell can include a multiplicity of cell units extending generally in a vertical as well as a horizontal direction. A porous, self-draining electrode assembly includes a current distributor in contact with a side of the electrode opposite the electrolyte active side of the electrode.

Abstract: A porous diaphragm is disclosed for use in an electrochemical cell having at least one electrode characterized as porous and self-draining. The diaphragm provides a way of obtaining uniformity of flow of an electrolyte through the diaphragm even when exposed to varying electrolyte head pressures. The porous diaphragm of the invention has a plurality of layers of a microporous polyolefin film or a composite comprising the microporous polyolefin film and a support fabric resistant to deterioration upon exposure to an aqueous solution of an ionizable compound.

Abstract: A porous diaphragm is disclosed for use in an electrochemical cell having at least one electrode characterized as porous and self-draining. The diaphragm provides a uniformity of flow of an electrolyte through the diaphragm even when exposed to varying electrolyte head pressures. The porous diaphragm of the invention has a plurality of layers of a microporous polyolefin film or a composite comprising the microporous polyolefin film and a support fabric resistant to deterioration upon exposure to an aqueous solution of an ionizable compound.

Abstract: Cell having a porous, self-draining, gas diffusion electrode contained within a frame and having on both sides of said electrode a liquid permeable microporous diaphragm. The electrode assembly contains an internally positioned current distributor. The cell has two oppositely charged electrodes separated by the electrode assembly which divides a single electrolyte compartment. In operation, electrolyte is flowed into the electrolyte compartment and spent electrolyte is removed. In one embodiment of the invention, the electrolyte is internally circulated by turbulent flow of electrolyte as the result of the upward movement of gas released at an electrode.