Sodium hypochlorite solution has significant advantages in disinfection, completely solving the technical problem of difficult solubility in water and precise dosing of gas disinfectants such as chlorine, chlorine dioxide, ozone, etc. It eliminates the safety hazards of liquid chlorine, chlorine dioxide, ozone and other chemicals, does not produce harmful health and environmental side reactions during disinfection, and does not produce many precipitates caused by the use of bleach powder. Because of these characteristics, sodium hypochlorite has been widely used for disinfection, epidemic prevention and disinfection and sterilization of various water bodies, including tap water, reclaimed water, industrial circulating water, swimming pool water, hospital sewage, etc. Large quantities of high concentration sodium hypochlorite are produced by chemical methods. However, due to the difficulty of long-term storage and inconvenient transportation of sodium hypochlorite solution, electrolysis is also used to produce sodium hypochlorite in fields such as water treatment, environmental protection, and health and epidemic prevention.
The principle of producing sodium hypochlorite by electrolysis method is to use diaphragm free electrolysis and generate sodium hypochlorite through homogeneous secondary chemical reactions. The concentration of NaCl electrolyte is low, ranging from 5% to 10%. The electrode process involves the dissolution of chlorine gas from the anode reaction in the electrolyte to generate HCl and HClO. Due to the absence of a separator in the electrolytic cell, H2 is precipitated from the cathode.
Total reaction formula: NaCl+H2O → NaClO+H2 ↑
The production of sodium hypochlorite by electrolysis can be divided into two types according to the working mode: intermittent and continuous; According to the structure of the reactor, it can be divided into two types: plate electrode reactor and tube electrode reactor. The former can use both sides of the electrode, while the latter can only use one side of the electrode.
The design of the electrodes for the sodium hypochlorite generator using the electrolysis method should take into account various factors, and be designed and manufactured based on the characteristics of compact and reasonable structure, economical operation indicators, convenient operation and maintenance, and long equipment service life. The chemical industry that produces chlorine gas, hydrogen gas, and caustic soda by electrolyzing salt water solution is called the chlor alkali industry, which is the largest field in modern electrochemical industry and plays an important role in the national economy.
In addition to the above, downstream products such as hydrogen chloride (aqueous solution is hydrochloric acid), sodium hypochlorite, chlorinated stone, and polyvinyl chloride (PVC Polyvinyl chloride polymer) can also be produced=
PVC molecular structure, hydrogen peroxide, etc.
In chlor alkali production, pure saturated salt water is used as the electrolysis solution, titanium electrode is used as the anode, and iron mesh attached asbestos wool is used as the cathode. The anode chamber produces chlorine gas, while the cathode chamber produces hydrogen gas and sodium hydroxide. After purification, it is widely used in various industrial production.
The application of titanium anodes has greatly promoted the development of the chlor alkali industry and is a groundbreaking contribution to the field of electrochemistry. The electrode has high catalytic activity for chlorine evolution and good electrocatalytic activity, mechanical stability, and chemical stability for chlorine evolution reactions. Therefore, it is an irreplaceable electrode material in today's chlor alkali industry, with a service life of more than five years.
The multi-coated titanium anodes produced by the company for sodium hypochlorite generators are available in various forms for users to choose from, including plates, nets, tubes, rods, wires, etc. The product performance is stable and the quality is reliable. The electrode coating has a long continuous service life, and the titanium substrate can be reused.
