In the laboratory temperature, under controllable conditions, the solid can be separated from the molten monohydrate under the electrolytic effect. The principle is based on the following response:
4 NaOH·H2O(l) → 4 Na(l) + O2(g) + 6 H2O(g)
This process does not need to be heated and melted (definition: the change process of substance from solid to liquid). Resistance heating of monohydrate will generate heat of satisfaction. However, to start it, a small amount of liquid water must be used to create a conductive electrolyte (property: complex). The liquid form of sodium hydroxide, also known as caustic soda and caustic soda. Due to different production processes in existing chlor alkali plants, the concentration of liquid alkali is usually 30-32% or 40-42%. It is an important basic chemical raw material with a wide range of uses. Chemical industry is used to manufacture formic acid, oxalic acid, borax, phenol, sodium cyanide and soap, synthetic fatty acid, synthetic detergent, etc. The chemical name of flake alkali is sodium hydroxide, which is a white translucent flake solid. It is a basic chemical raw material. It is widely used in papermaking, synthetic detergent, soap, viscose fiber, rayon, cotton and other light textile industries, pesticide, dye, rubber and chemical industries, petroleum drilling, petroleum oil refining and tar refining industries, as well as national defense industry, machinery industry and wood Processing, metallurgical industry, pharmaceutical industry and urban construction. Sewage treatment sheet alkali water treatment industry is widely used as neutralizer, and widely used in the chemical industry for various sodium salt manufacturing, soap, paper making, cotton fabrics, silk, viscose fiber, rubber products regeneration, metal cleaning, electroplating, bleaching, etc. Flake alkali has strong corrosiveness, and it has special requirements for the safety protection of flake alkali. As the temperature of the system increases, the monohydrate will start to melt, and at about 65 ℃, as mentioned above, only when the temperature reaches about 100 ℃, sodium can be blocked. Below this temperature, water will react with sodium. At the above point, no water of any composition will be allowed in the vapor phase to create a basically anhydrous reaction. Although this process has some advantages over other electrolysis processes, it is not the first choice for most chemists, because it will make the appearance of sodium present many gases. These gases are made up of a lot of sodium oxide, and at the end form a dense corrosive effect on the surface.