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Calcium nitrite

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Products Intro: Product Name:Calcium nitrite
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Calcium nitrite manufacturers

  • Calcium nitrite
  • $1.00 / 25Kg/Drum
  • 2021-04-12
  • CAS: 13780-06-8
  • Min. Order: 25Kg/Drum
  • Purity: 99%
  • Supply Ability: 20tons
  • Calcium nitrite
  • $1.00 / 1drums
  • 2020-11-20
  • CAS:13780-06-8
  • Min. Order: 1KG
  • Purity: 98%
  • Supply Ability: 1kg
  • Calcium nitrite
  • $9.80 / 1.79999995231628KG
  • 2020-01-09
  • CAS:13780-06-8
  • Min. Order: 1g
  • Purity: ≥99%
  • Supply Ability: 100kg
Calcium nitrite Basic information
Product Name:Calcium nitrite
Synonyms:Nitrous acid, calcium salt (2:1);Nitrousacid,calciumsalt;CALCIUM NITRITE;CALCIUM NITRITE, 30 WT. % SOLUTION IN WA TER;CalciumNitriteCa(NO3)2*4H2O;calcium nitrite solution;CALCIUM NITRITE ANHYDROUS;Calcium dinitrite
Product Categories:Calcium Salts;CalciumMetal and Ceramic Science;Inorganics;Inorganic Salts;Salts;Synthetic Reagents;Inorganic Chemicals
Mol File:13780-06-8.mol
Calcium nitrite Structure
Calcium nitrite Chemical Properties
Melting point 390 °C
density 2.23
refractive index n20/D 1.3946
Fp 110 °C
form white-yellow hexagonal crystals
Water Solubility slightly soluble alcohol [MER06]; g/100g solution H2O: 38.3 (0°C), 43.0 (18.5°C), 71.2 (91°C); solid phase Ca(NO2)2 · 4H2O (0°C, 18.5°C), Ca(NO2)2 ·2H2O (91°C) [KRU93]
Merck 13,1688
CAS DataBase Reference13780-06-8(CAS DataBase Reference)
EPA Substance Registry SystemCalcium nitrite (13780-06-8)
Safety Information
Safety Statements 23-24/25
WGK Germany 3
MSDS Information
Calcium nitrite English
SigmaAldrich English
Calcium nitrite Usage And Synthesis
DescriptionCalcium nitrite has the formula of Ca(NO2)2 and the molecular weight of 132.0894 g/mol. It can be made by the usual double decomposition reaction of sodium nitrite and CaCl2. It forms a tetrahydrate that is isomorphous with the strontium and barium salts:
2Na2NO2 (aq) + CaCl2 ? Ca(NO2)2 (aq) + 4NaCl (aq)
Chemical Propertieswhite or yellowish deliquescent, hexagonal crystal(s); prepared from nitric oxide and a mixture consisting of calcium ferrate and calcium nitrate; used to inhibit corrosion in lubricants and concrete [MER06]
Physical propertiesCalcium nitrite, Ca(NO2)2, has the CAS number of 13780-06-8 and occurs as yellow-white crystals. It is very hygroscopic. Its density is 2.23 g/cm3 and it decomposes at 392°C to form nitrogen oxides and CaO. It is slightly soluble in alcohol. Ca(NO2)2·4H2O loses two waters of hydration at about 80°C and one at 105°C to form the monohydrate. It loses the other at about 155°C. The anhydrate, if further heated, is unstable and oxidizes to the nitrate in air above 220°C:
Ca(NO2)2 + O2 + heat?Ca(NO3)2
UsesCalcium nitrite has several industrial uses:
1. Calcium nitrite has high solubility, so can be used as a solution or powder in concrete as an “anti-freeze” during winter months as needed. Using this antifreeze at negative temperature can promote the hydration of minerals in cement, and the freezing point of operative temperature can be reduced to –25°C.
2. This salt is a steel rust inhibitor: calcium nitrite can clean steel and protect it from rust, and can protect steel material in concrete used to construct buildings and structures, to extend the useful life of concrete in buildings.
3. In concrete, Ca(NO2)2 acts as a coagulator: calcium nitrite is free of chlorine and alkali, capable to reduce alkali aggregation of concrete and improve its early strength and compressive resistance. The calcium nitrite protects steel reenforcing bars from chlorideinduced corrosion. One advantage to calcium nitrite is that its protection mechanism is well defined. Data are known that show the levels of chloride to which given levels of calcium nitrite will protect. Once corrosion initiates, the rates are lower with calcium nitrite present. These results have been used to produce reinforced concrete structures with durability in excess of 50–100 years.
4. Calcium nitrite can be used as corrosion inhibitor when added to lubricating agents.
5. Calcium nitrite can also be used in pharmaceutical, dyes and metallurgy industries, as a mild reducing agent.
UsesCorrosion inhibitor in lubricants, concrete.
PreparationIndustrially, calcium nitrite is manufactured by reacting “NOX” gas with “lime”:
Ca(OH)2 + NO +NO2?Ca(NO2)2 +H2O
By carefully controlling calciumnitrite conditions, the selectivity on converted lime, on a molar basis, is over 95% pure. It is soluble in water (98.2 g/100 ml at 20 °C) and the solution must be evaporated at low temperature to obtain the tetrahydrate. If heated with NO2 gas, it also form the nitrate:
Ca(NO2)2 + NO2?Ca(NO3)2 + NO
Anhydrous calcium nitrite is unstable and slowly oxidizes in air to form the nitrate. It is also soluble in alcohol at 0.97 g/100 ml at 20 °C.
General Description
Calcium nitrite solution (Ca(NO2)2) is widely utilized as a corrosion inhibitor. It protects the metal surface against chloride attack and increases the threshold level and improves the overall life of the concrete. Ca(NO2)2 does not change the mechanical properties of the cement.
Purification MethodsCrystallise it from hot water (1.4mL/g) by adding ethanol and cooling to give the hydrate. It is deliquescent. [Ray & Ogg J Am Chem Soc 79 265 1957.]
Calcium nitrite Preparation Products And Raw materials
Raw materialsNitric acid-->Ammonia-->Nitrogen-->Calcium hydroxide-->CALCIUM CARBONATE
Tag:Calcium nitrite(13780-06-8) Related Product Information
RADIUMNITRATE STRONTIUM NITRIDE Magnesium nitrate strontium nitrite Beryllium nitrate FERROUS SULFATE Sodium nitrate Calcium nitrate Calcium nitrite nitric acid, ammonium calcium salt CALCIUM NITRATE HYDRATE Calcium nitrate tetrahydrate Calcium nitrite tetrahydrate CALCIUM NITRITE MONOHYDRATE Calcium nitrate trihydrate. BIS(4-NITROPHENYL)PHOSPHORIC ACID CALCIUM SALT CALCIUM NITRATE-15N2 4H2O CALCIUM NITRATE-15N