Product use

1. Used for the production of papermaking and cellulose pulp;
2. Used for the production of soaps, synthetic detergents, synthetic fatty acids and the refining of animal and vegetable oils.
3. Textile printing and dyeing industry used as cotton desizing agent, scouring agent and mercerizing agent.
4. The chemical industry is used to produce borax, sodium cyanide, oxalic acid, phenol, etc.
The oil industry refines petroleum products and USES them in oilfield drilling mud. Also used in the production of alumina, zinc and copper metal surface treatment and glass, enamel, tanning, medicine, dyes and pesticides.
6. Food grade products are used as acid neutralizer in the food industry, which can be used as peel remover for oranges and peaches, detergent for empty bottles and cans, as well as decolorizing agent and deodorant.
7 can also be used as an alkaline desiccant. Caustic soda is widely used in the national economy and is needed in many industrial sectors. The largest use of caustic soda is in the manufacture of chemicals, followed by papermaking, aluminum refining, tungsten refining, rayon, rayon, and soap manufacturing. In addition, in the production of dyes, plastics, agents and organic intermediates, old rubber regeneration, metal sodium, water electrolysis and inorganic salt production, borax, chromium salt, manganese salt, phosphate, etc., also need to use a large number of caustic soda.

Toxicity of protective

Highly corrosive, its solution or dust splash on the skin, especially to the mucous membrane, can produce a soft scab, and can penetrate deep tissue. The burn left a scar. Splash into the eye, not only damage the cornea, but also damage the deep tissue of the eye. In case of accidental splashing on the skin, rinse immediately with clean water for 10min; If splash into eyes, rinse immediately with clean water or normal saline for 15min, then add 2% novocaine. Serious person sends a hospital to treat quickly. The maximum allowable concentration of caustic soda dust in the air is 0.5mg/m3. Operators must wear work clothes, masks, protective glasses, rubber gloves, rubber apron, rubber boots and other labor protection supplies. Apply a neutral and hydrophobic ointment to the skin. The workshop should be well ventilated.

Packaging storage and transportation

In general, three layers of plastic woven bags of 25kg are used for flake alkali, the inner layer and outer layer are plastic woven bags, and the middle layer is plastic inner layer bag. The caustic soda is classified as class 8.2 alkaline corrosion product in the classification and marking of commonly used hazardous chemicals (GB 13690-92), and belongs to class 8 dangerous goods. The code of hazard code is 1823. Store in ventilated, dry warehouse or shed. The packing container should be complete and sealed. Must not be mixed with inflammables and acids. Pay attention to moisture and rain during transportation. Fire, you can use water, sand and a variety of fire extinguishers, but the fire personnel should pay attention to the causticity of caustic soda dissolved in the water.

Physical and chemical properties

Pure for colorless transparent crystal, relative density of 2.130. The melting temperature of 318.4 ℃. The boiling point of 1390 ℃. Commercially available caustic soda has solid and liquid two: pure solid caustic soda is white, has a block, sheet, bar, granular, brittle; Pure liquid caustic soda is colorless transparent liquid. Solid caustic soda has strong hygroscopicity. Soluble in water, heat release when dissolved, aqueous solution is alkaline, has the slippery feeling; Soluble in ethanol and glycerol; Insoluble in acetone and ethyl ether. Highly corrosive, corrosive to fiber, skin, glass, ceramics, etc. React with metal aluminum, zinc, nonmetal boron and silicon to release hydrogen. Disproportionation with halogens such as chlorine, bromine, iodine, etc. To form salt and water by neutralizing with acids.

When storing solid sodium hydroxide, be careful to seal it tightly to prevent exposure to air to absorb moisture and deliquescence or carbon dioxide. In glass bottles containing tablets of alkali or other forms of sodium hydroxide, do not use a glass plug, should be replaced by a rubber plug, because sodium hydroxide will react with silica in the glass to produce sodium silicate, resulting in cork and bottle body bonding is not easy to open.