CHLOR-ALKALI ANODES & CATHODES
The Anodic Process
An anode chamber is filled with high-density refined salt water (NaCl) by removing impurities and the anode is soaked in Brine solution and connected to a direct electric current (+).
NaCl reacts and ionizes into Na+ and Cl- ions. The Cl- ion is oxidized by anode and becomes chlorine gas (Cl2).
Na+ ion is permeated with the ion exchange membrane with water and processed to a cathode chamber. The generated chlorine gas and Brine solution of lower density is discharged from the anode chamber.
The Cathodic Process
A cathode chamber is filled with the slightly diluted caustic soda (NaOH) and pure water and then the cathode is soaked in caustic soda and connected to the direct electric current (-).
Water in the cathode chamber is ionized to H+ and OH- ions. H+ ion is deoxidized by cathode and becomes hydrogen gas (H2).
The OH- ion bonds to the Na+ ion from the anode to make caustic soda (NaOH). The generated hydrogen gas and caustic soda are discharged from the cathode chamber. Pure water is always supplied to maintain the density designated for caustic soda in the cathode chamber and the density of 32wt% is kept for optimization of the ion exchange membrane.
The Ion Exchange Membrane
Ion exchange membrane selectively permeates only the positive ion and water with ions in an anode chamber then to a cathode chamber. Therefore, an ion exchange membrane also takes on the role to prevent caustic soda and water in a cathode chamber from moving to an anode chamber, and chlorine gas in an anode chamber from moving to a cathode chamber.
Our Anodic & Cathodic Electrodes
- Low Oxygen Evolution
- Low Hydrogen Overpotentials
- High on savings due to reduced power consumption
- Low Voltage operation capability
- Long life