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Calcium nitrite

Calcium nitrite
Calcium nitrite structure
CAS No.
13780-06-8
Chemical Name:
Calcium nitrite
Synonyms
Daraset;CALCIUM NITRITE;Calcium dinitrite;Nitrousacid,calciumsalt;calcium nitrite solution;CALCIUM NITRITE ANHYDROUS;CalciumNitriteCa(NO3)2*4H2O;CalciuM nitrite solution 30 wt. % in H2O;CALCIUM NITRITE, 30 WT. % SOLUTION IN WA TER
CBNumber:
CB6709679
Molecular Formula:
CaN2O4
Formula Weight:
132.09
MOL File:
13780-06-8.mol

Calcium nitrite Properties

Density 
2.23
refractive index 
n20/D 1.3946
Flash point:
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 Reference
13780-06-8(CAS DataBase Reference)
EPA Substance Registry System
Nitrous acid, calcium salt(13780-06-8)
SAFETY
  • Risk and Safety Statements
Safety Statements  23-24/25
WGK Germany  3

Calcium nitrite price More Price(1)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 521051 Calcium nitrite solution 30 wt. % in H2O 13780-06-8 1l $38.5 2018-11-13 Buy

Calcium nitrite Chemical Properties,Uses,Production

Description

Calcium 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 Properties

white 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 properties

Calcium 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

Uses

Corrosion inhibitor in lubricants, concrete.

Uses

Calcium 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.

Preparation

Industrially, 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 sol

Purification Methods

Crystallise 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 materials

Preparation Products


Calcium nitrite Suppliers

Global( 78)Suppliers
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