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칼슘 아질산염

칼슘 아질산염
칼슘 아질산염 구조식 이미지
카스 번호:
13780-06-8
한글명:
칼슘 아질산염
동의어(한글):
칼슘아질산염;아질산칼슘;칼슘나이트라이트;칼슘아질산염(CALCIUMNITRITE)
상품명:
Calcium nitrite
동의어(영문):
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
분자식:
CaN2O4
포뮬러 무게:
132.09
MOL 파일:
13780-06-8.mol

칼슘 아질산염 속성

밀도
2.23
굴절률
n20/D 1.3946
인화점
110 °C
물리적 상태
white-yellow hexagonal crystals
수용성
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 데이터베이스
13780-06-8(CAS DataBase Reference)
EPA
Nitrous acid, calcium salt(13780-06-8)

안전

안전지침서 23-24/25
WGK 독일 3

칼슘 아질산염 MSDS


Calcium nitrite

칼슘 아질산염 C화학적 특성, 용도, 생산

개요

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)

화학적 성질

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]

물리적 성질

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

용도

Corrosion inhibitor in lubricants, concrete.

용도

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.

제조 방법

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.]

칼슘 아질산염 준비 용품 및 원자재

원자재

준비 용품


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