Industry
1. When electrolyzing sodium chloride aqueous solution, hydrogen and chlorine will be produced, and chlorine is widely used in chemical industry, which can be used to synthesize polyvinyl chloride, pesticides, hydrochloric acid, etc.
2. Sodium metal is prepared by Dangsi method: sodium metal is prepared by electrolytic fusion of a mixture of molten sodium chloride and calcium chloride. Calcium chloride is used as a flux to reduce the melting point of sodium chloride below 700°C. Calcium is not as reducible as sodium and does not introduce impurities.
3. Sodium chloride is necessary for many biological reactions, such as sodium chloride in a variety of solution formulations in molecular biology experiments, and most of the bacterial culture medium contains sodium chloride. At the same time, it is also the raw material for ammonia-alkali soda ash production.
4. Inorganic and organic industries are used as raw materials for the manufacture of caustic soda, chlorate, hypochlorite, bleaching powder, refrigerants for refrigeration systems, raw materials for organic synthesis and salting out agents. It is used as a heat treatment agent in the steel industry. The high-temperature heat source is prepared with potassium chloride and barium chloride to form a salt bath, which can be used as a heating medium to maintain the temperature between 820~960 °C. In addition, it is also used in glass, dyes, metallurgy and other industries.
5. The analytical reagent is used as a fluorine and silicate trace analysis reagent.
6. Hou's alkali method to produce soda ash: the second step: mix the ammonium bicarbonate solution prepared in the first step with the sodium chloride solution to obtain sodium bicarbonate and ammonium chloride at 10 °C.
Food industry
1. The food industry and fishery are used for salting, and can also be used as raw materials for seasonings and refined salt.
2. Adding salt to cooking dishes can remove some peculiar smells of raw materials and increase deliciousness, which is the freshness of salt. "Bland, salty and tasteless" means that the amount of salt used should be appropriate in order to play its unique function. [1]
3. Gluten protein has a great relationship with the processing characteristics and eating quality of noodles, and sodium chloride can change the formation of gluten protein by changing the degree of gluten hydration and the ionic strength in the dough, thereby affecting the texture and cooking quality of noodles.
Medical
1. Sodium chloride is very important for life on Earth. Most biological tissues contain a variety of salts. The concentration of sodium ions in the blood is directly related to the regulation of safe levels of body fluids. The conduction of nerve impulses caused by signal switching is also regulated by sodium ions.
2. Water containing 0.9% sodium chloride is called normal saline because it has the same osmotic pressure as plasma. Normal saline is the main fluid substitute and is widely used for the treatment and prevention of dehydration, as well as for intravenous therapy and prevention of hypotroplasmic shock.
3. Unlike other primates, humans secrete large amounts of sodium chloride through sweating. Sodium chloride is indispensable. The total amount of sodium ions in the adult body is about 60 g, of which 80% is present in the extracellular fluid, i.e. in the plasma and intercellular fluid. Chloride ions are also mainly found in extracellular fluids. The physiological functions of sodium and chloride ions are mainly as follows:
(1) Maintain the osmotic pressure of extracellular fluid;
(2) Participate in the regulation of acid-base balance in the body;
(3) Chloride ions are involved in the production of gastric acid in the body, in addition, sodium chloride also plays a role in maintaining the normal excitability of nerves and muscles.
Agriculture
Its aqueous solution can be used for seed selection. NaCl solutions are prepared according to the needs of the species, which are denser than water. The seeds are put into NaCl solution, and the floating ones are not full, and the sinking ones are full.
Other
According to the findings released by Dr. Joel Yang, a Chinese researcher at Singapore Science and Technology Research, sodium chloride can significantly increase the capacity of hard drives. Specifically, existing traditional hard drives use randomly allocated magnetic chip storage technology, which can only achieve a data density of 0.5 terabytes per square inch. Thanks to the new technology with sodium chloride, the new high-resolution lithography factor technology will allow the data density to be more orderly, reaching 3.3 terabytes per square inch without the need for complex equipment upgrades. Enabling 1 TB hard drives with this technology allows for 6 TB of capacity without increasing the platter.
