Brief Introduction of Preparation of Sodium 1.
The preparation method of sodium is currently mainly composed of two methods:
1, is the absorption method to prepare sodium chlorite ---- hydrogen peroxide method.
Hydrogen peroxide method is sodium chlorate dissolved in water and then added to the chlorine dioxide generator; then the mixed gas of sulfur dioxide and air into the generator. In the presence of sulfuric acid, sulfur dioxide and sodium chlorate undergo a reduction reaction. The generated chlorine dioxide is diluted to the explosion-proof level (10%) and then sent to the bubbling absorption tower filled with hydrogen peroxide and liquid alkali to generate sodium. After the reaction solution is precipitated, its clear night is sodium liquid product. If you need to make a solid product, it should also be evaporated, crystallized, and dried. The reaction principle of this method is:
2. Electrolysis method
The electrolysis method is to dissolve sodium chlorate in water and add sulfuric acid to prepare a mixture and add it to the chlorine dioxide generator. Then the mixed gas of sulfur dioxide and air (containing SO2 8%-10%) is introduced into the chlorine dioxide generator for reaction to generate chlorine dioxide gas, which is sent to the cathode chamber of the electrolytic cell. The anode chamber of the tank is continuously fed with brine and distilled water for electrolysis. Chlorine dioxide obtains electrons from the cathode and becomes pressure filter acid, and chlorine ions are discharged at the anode and become chlorine gas to escape. Sodium ions are combined with pressure filter acid at the cathode under the action of DC electric field to form sodium chlorite, which is evaporated, crystallized and dried to obtain solid products. The hair reaction principle is:

The process flow diagram of this method is shown below:

quality standard]
The national professional standard ZB/TG 12015-89 (industrial sodium chlorite) is as follows:
Brief Description of Sodium 1. Production Process
Sodium production is mainly divided into two steps, step is sulfuric acid, sodium chlorate and reducing agent as raw materials, reflecting the production of chlorine dioxide. The second step is the absorption of chlorine dioxide in the lye through the role of oxides to generate sodium. Liquid sodium production is relatively simple, only the reaction and absorption process, and solid sub-production in the production of liquid sodium has to increase evaporation concentration, crystallization, filtration, drying, crushing, packaging and other production processes and devices.
(I), solid sodium production needs chemical raw materials
1 Sulfuric acid industrial products
2 Sodium Chlorate Industrial Products
3 Sulfur dioxide industrial products
4 pieces of alkali industrial products
5 Hydrogen peroxide
(II), hydrogen peroxide method liquid sodium needs chemical raw materials (the concentration of sodium per ton has been generated is 22.5-25%)
1 Sulfuric acid industrial products
2 Sodium Chlorate Industrial Products
3 Liquid alkali industrial products
4 Hydrogen peroxide industrial products
Analysis of the application prospect of 2. technology:
Sodium is a strong oxidant, white crystal, because often contains chlorine dioxide with yellow green. There are two forms of anhydrous substance and trihydrate. Its transfer temperature is 38 ℃, which is slightly hygroscopic and stable at normal temperature. Industrial sodium is heated to 130-140 ℃ due to its content and other impurities, and even chlorine gas will be decomposed at lower temperature. Dissolves into water and alcohol, especially in water solubility is very large. The alkaline aqueous solution of sodium is stable to light, and the acidic aqueous solution is easy to release chlorine dioxide gas.
As an efficient bleaching agent and oxidizing agent (available chlorine content 157%), sodium is mainly used for bleaching fabrics, fibers, pulp, etc. It has the characteristics of small fibers. At the same time, it can also bleach sugar, milk, fat and plants. Also used in the leather industry of the original skin hair removal, some metal surface treatment, drinking water and sewage treatment.
Especially in recent years, with the rapid development of China's industrial water treatment industry. Chlorine dioxide has been widely used as an efficient bactericidal and algaecide, which provides an opportunity for the development of sodium. In addition, the application of sodium in drinking water, aquaculture, food, health and other industries is also increasingly broad. As a result, sodium sales have gradually expanded, often in a state of supply and demand. According to national statistics in 2000, the annual national consumption of sodium is more than 10,000 tons. At present, there are only 5 domestic manufacturers of sodium nitrite, with an annual production of only about 1,000 tons. The amount of products is increasing year by year. With the further strengthening of the government's efforts to control the environment, the use of sodium and the amount of sodium will increase. The gap of sodium will increase year by year.