Nitrousacid,calciumsalt
Calcium nitrite
CAS: 13780-06-8
Molecular Formula: CaN2O4
Nitrousacid,calciumsalt - Names and Identifiers
| Name | Calcium nitrite |
| Synonyms | 237-424-2 CALCIUM NITRITE Calcium nitrite Calcium dinitrite calcium dinitrite Nitrousacid,calciumsalt calcium nitrite solution CALCIUM NITRITE ANHYDROUS CalciumNitriteCa(NO3)2*4H2O |
| CAS | 13780-06-8 |
| EINECS | 237-424-2 |
| InChI | InChI=1/Ca.HNO2/c;2-1-3/h;(H,2,3)/q+2;/p-1 |
Nitrousacid,calciumsalt - Physico-chemical Properties
| Molecular Formula | CaN2O4 |
| Molar Mass | 132.09 |
| Density | 2.23 |
| Melting Point | 390 °C |
| Flash Point | 110°C |
| 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] |
| Appearance | white-yellow hexagonal crystals |
| Merck | 13,1688 |
| Refractive Index | n20/D 1.3946 |
| Physical and Chemical Properties | The pure product is colorless to light yellow hexagonal crystal, easy to deliquescence. relative density 2.23 solubility soluble in water, slowly soluble in alcohol. |
| Use | Can be used as the main raw material of concrete antifreeze, early strength agent, steel corrosion inhibitor |
Nitrousacid,calciumsalt - Risk and Safety
| Safety Description | S23 - Do not breathe vapour. S24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 3 |
Nitrousacid,calciumsalt - Upstream Downstream Industry
Nitrousacid,calciumsalt - Reference Information
| LogP | -2.52 at 20℃ |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| solubility in water (g/100ml) | grams dissolved per 100ml of water at different temperatures (℃): 63.9g/0 ℃;84.5g/20 ℃;104g/30 ℃ 134g/60 ℃;151g/80 ℃;166g/90 ℃;178g/100 ℃ |
| toxicity | see sodium nitrite. |
| Application | can be used as the main raw material of concrete anti-freezing agent, early strength agent and steel corrosion inhibitor widely used in reinforced concrete engineering, used as cement hardening accelerator and anti-freezing rust inhibitor, the life of reinforced concrete structure can be increased by 15~20 years when 2% calcium nitrite is added to concrete. Corrosion inhibitors for the pharmaceutical industry, organic synthesis and lubricating oils. |
| production method | industrial production mainly adopts milk of lime to absorb Nox to produce calcium nitrite, with continuous method and batch method. Continuous process is used to produce mixed gas containing 5%~ 0.5% NOx by discharging tail gas (containing NO + NO2 1.5% ~ 10%) in dilute nitric acid production process or by air oxidation of gas ammonia, the molar ratio of NO and NO2 is controlled to be about 1.5, and it is passed into the first-stage reactor at 40~70 ℃, and the mixture of gas and liquid is fully mixed and contacted, so that the milk of lime continuously absorbs Nox in the raw material gas, until the Nox content in the outlet gas is less than 1.5%, it is sent to the tower oxidizer, and ammonia gas is introduced to react with excess NO2 at 75~100 ℃ and 2~10kg/cm2 pressure, reduce the content of No2. In the secondary reactor, the primary neutralization liquid continues to absorb the tail gas of the primary reactor until the Nox content falls below 0.3%, and the pH value of the solution is controlled to be above 11, so that the secondary neutralization liquid contains 33.5% of calcium nitrite, which is filtered, the filtrate was concentrated by evaporation, cooled to crystallize, centrifuged and dried to obtain a calcium nitrite product. Ca(OH)2 + NO + NO2 → Ca(NO2)2 · H2O |
Last Update：2024-04-09 19:05:07
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Raw Materials for Nitrousacid,calciumsalt