The chlor-alkali industry — in which chlorine(Cl2) and sodium hydroxide/caustic soda (NaOH) are produced simultaneously by electrolytic decomposition of saltwater/brine (NaCl) — has become the principal source of chlorine in modern chemical industry. The main process types used for electrolysis of saturated sodium chloride solution are : 1) diaphragm cell process, 2) mercury cell process, 3) membrane cell process.
Solution Reaction: 2NaCl + 2H₂O → 2NaOH + Cl₂↑ + H₂↑
Howerver, the electrolyzing process in an membrane cell with positive and negatively charged electrodes is the most common and economical way preferred. Amongst all the integrated components in the cell, the quality of anode and cathode is such imperative parts that drastically affecting equipment efficiency. With excellent stability and high conductivity, our titanium mesh plate anodes are the optimum choice for long-term and large scale chlor-alkali production.
Dimensionally stable anodes (DSA) have gradually replaced graphite anodes in the chlor-alkali industry due to their excellent electrochemical performance. Titanium is considered an optimum choice for electrode substrate, as titanium could spontaneously forms a protective oxide layer that protects the substrate from electrolyte erosion. In addition, titanium has no significant resistance to current flow. Regarding the electrocatalytic material, the selection of ruthenium oxide helps to improve the stability of the coating, and titanium oxide is added as a stabilizer for the metal oxide.