Industrial use
Molecular structure diagram
1, used as a multi-purpose desiccant, such as nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide and other gases. Used as dehydrating agent in the production of alcohol, ester, ether and acrylic resin. Calcium chloride aqueous solution is an important refrigerant for freezer and ice making, which can accelerate the hardening of concrete and increase the cold resistance of building mortar. It is an excellent antifreeze for buildings. Used as port antifogging agent, road cleaner and fabric flame retardant. Used as protective agent and refining agent in aluminum-magnesium metallurgy. It is a precipitant for producing lake pigments. Deinking for waste paper processing. It is a raw material for producing calcium salt.
2. Chelating agent; Curing agent; Calcium fortifier; Refrigerant for freezing; Desiccant; Anticaking agent; Microbial inhibitors; Pickling agent; Tissue improver.
3. Used as desiccant, road dust collector, defogging agent, fabric flame retardant, food preservative and used for making calcium salt.
4. Used as lubricant additive.
5, used as analytical reagent
6. Mainly used for treating tetany, urticaria, exudative edema, intestinal and ureteral colic, magnesium poisoning, etc. Caused by hypocalcemia.
7. Used as calcium enhancer, curing agent, chelating agent and desiccant in food industry.
8, can increase the permeability of bacterial cell wall [2].
Medical use
Indications:
1, this product can be used for colic, etc.
2. It can be used for pruritic dermatosis.
3, used to rescue magnesium salt poisoning.
4, vitamin D deficiency rickets, rickets, pregnant women and lactating women.
5. Treat tetany caused by calcium deficiency, acute hypocalcemia, alkalosis, hypoparathyroidism and vitamin D deficiency.
6. Allergic diseases;
7. Rescue of magnesium poisoning;
8. Rescue of fluorosis;
9, the application of cardiac resuscitation, such as hyperkalemia, hypocalcemia or calcium channel block caused by cardiac insufficiency rescue.
10, calcium chloride solution can induce the polymerization of actin monomer, and the critical concentration of actin monomer is inversely proportional to the concentration of calcium chloride solution. The specific mechanism of actin-induced polymerization is related to the combination of calcium ions with specific parts of protein.
desiccant
Granular anhydrous calcium chloride is often used as a desiccant to fill drying pipes, and giant algae (or seaweed ash) dried with calcium chloride can be used to produce soda ash. Some home dehumidifier, such as DampRid, use calcium chloride to absorb moisture in the air. Calcium chloride can also be used as a desiccant or dehydrating agent for gases and organic liquids. Because calcium chloride is neutral, it can dry acidic or alkaline gases and organic liquids, and it can also dry a small amount of gases, such as nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide, carbon dioxide, nitrogen dioxide and so on. In the lab. But it can't be used to dry ethanol and ammonia, because ethanol and ammonia will react with calcium chloride to produce alcohol compound CaCl2 4C2H5OH and ammonia compound CaCl2 8NH3 respectively. Anhydrous calcium chloride can also be made into household products and used as air absorbent. Anhydrous calcium chloride, as a water absorbent, has been approved by FDA for dressing first aid, and its function is to ensure the dryness of wounds.
When the air humidity is lower than the dew point, anhydrous calcium chloride is sprinkled on the sandy pavement, and the moisture in the air is condensed to keep the pavement moist, thus controlling the dust on the pavement.
Deicing agent and cooling tank
Calcium chloride can reduce the freezing point of water, and sprinkling hydrated calcium chloride on the road surface can prevent icing and deicing, but the salt water after melting ice and snow will destroy the soil and vegetation along the road and worsen the pavement concrete.
Calcium chloride solution can also be mixed with dry ice to make a low-temperature cooling bath. Rod-shaped dry ice is added to the saline solution in batches until ice cubes appear in the system. The stable temperature of cooling bath maintained by different kinds and concentrations of salt solution is different. Generally, calcium chloride is commonly used as salt raw material, and the required stable temperature can be obtained by adjusting the concentration, not only because calcium chloride is cheap and easy to obtain, but also because the crystallization temperature of calcium chloride solution (that is, the temperature when the solution completely condenses to form granular ice salt particles) is quite low, reaching -5 1.0℃, which makes the adjustable temperature range from 0℃ to -5 1℃. This method can be realized in a Dewar bottle with thermal insulation effect, or in the case that the Dewar bottle has limited volume and needs to prepare more salt solution, the cooling bath can be filled in a common plastic container. In this case, the temperature maintenance is also relatively stable.
The source of calcium ion
Adding calcium chloride into the swimming pool water can make the pool water become a pH buffer solution, increase the hardness of the pool water and reduce the erosion of the pool wall concrete. According to Le Chatterley's principle and the same ion effect, increasing the concentration of calcium ions in pond water will slow down the dissolution of calcium compounds necessary for concrete structure.
Adding calcium chloride to the water of marine aquarium can increase the content of bioavailable calcium in the water, and mollusks and coelenterates cultured in aquarium will use it to form calcium carbonate shells. Although calcium hydroxide or calcium reactor can achieve the same goal, adding calcium chloride is the fastest method and has the least influence on the pH value of water.
food
As a food ingredient, calcium chloride can play the role of chelating agent and curing agent. It has been approved as a food additive by the European Union, and its E code is E509. It is considered as "generally safe" by the US Food and Drug Administration (GRAS). It is estimated that the daily intake of calcium chloride food additives per person is 160 ~ 345mg.
As a curing agent, calcium chloride can be used in canned vegetables. It can also solidify tofu to form tofu, and it can also be used as a raw material for cooking molecular food to gelatinize the surface of vegetables and fruit juice, and react with sodium alginate to form caviar-like balls. As an electrolyte, it is added to sports drinks or some soft drinks including bottled water. Because calcium chloride itself has a very strong salty taste, it can be used to make pickles instead of salt without increasing the sodium content of food. Calcium chloride can lower the freezing point and delay the freezing of caramel in caramel filled chocolate bars.
Calcium chloride will be added to the beer brewing liquid lacking minerals, because calcium ion is one of the most influential minerals in the beer brewing process, which will affect the acidity of wort and the function of yeast. Calcium chloride can bring sweetness to brewed beer.
otherwise
Hydrated calcium chloride solid can be used as phase change energy storage material. For example, because the melting point of calcium chloride hexahydrate is 30℃, the heat of solution (that is, the heat absorbed in the process of changing from solid phase to liquid phase at the same temperature) reaches 1.90 kJ/mol, so calcium chloride hexahydrate can be used as a medium-low temperature for industrial waste heat recovery and solar radiation heat absorption and utilization. However, similar to all inorganic hydrated salt phase change materials, it has serious supercooling problem (its supercooling reaches 20℃), which needs to be overcome by adding nucleating agent.
Calcium chloride is helpful to accelerate the initial setting in concrete, but chloride ion will cause corrosion of steel bars, so calcium chloride cannot be used in reinforced concrete. Anhydrous calcium chloride can provide concrete with a certain degree of moisture because of its hygroscopicity.
Calcium chloride is also an additive for plastics and fire extinguishers. It is used as a filter aid in wastewater treatment and as an additive in blast furnace to control the aggregation and adhesion of raw materials to avoid the settlement of burden, and plays the role of diluent in fabric softener.
The exothermic nature of calcium chloride solution makes it used in self-heating tanks and heating pads.
In petroleum industry, calcium chloride is used to increase the density of solid-free brine, and can also be added to the water phase of emulsified drilling fluid to inhibit the expansion of clay. As a flux, it plays a role in reducing the melting point in the process of producing metallic sodium by electrolysis of molten sodium chloride by David method. When making ceramics, calcium chloride will be used as one of the material components, which will make clay particles suspended in the solution, so that clay particles can be more easily used during grouting.