硝酸カルシウム 化学特性,用途語,生産方法
解説
Ca(NO3)2(164.09).炭酸カルシウムを硝酸に溶かして濃縮すると四水和物が得られる.四水和物は無色の単斜晶系結晶.密度1.82 g cm-3.潮解性で,融点42.7 ℃ で結晶水に溶けて,132 ℃ で無水物となる.無水物は無色の等軸晶系粉末.融点561 ℃.密度2.36 g cm-3.潮解性で,赤熱すれば亜硝酸カルシウムになる.四水和物,無水物とも水,エタノール,メタノール,アセトンに可溶,エーテルに不溶.肥料,染色,他の硝酸塩,花火(橙赤色),爆薬の製造,レンズの原料などに用いられる.[CAS 10124-37-5:Ca(NO3)2][CAS 13477-34-4:Ca(NO3)2・4H2O]
森北出版「化学辞典(第2版)
用途
主たる用途は肥料、花火、冷媒用剤、染色加工剤である。(混触危険HB(第2版))
用途
硝酸カルシウムは,速効性肥料としてハウス栽培や園芸用に使用される。染色,他の硝酸塩,花火(橙赤色),爆薬の製造,レンズの原料などに用いられる.
説明
Calcium nitrate has the molecular formula of
Ca(NO3)2 and the molecular weight of 164.0935 g/mol.
Its CAS number is 10124-37-5. Calcium nitrate may be
prepared by the reaction of nitric acid with calcium
carbonate or calcium sulfide:
CaCO3 + 2HNO3 ? Ca(NO3)2 + CO +H2O
CaS + 2HNO3 ? Ca(NO3)2 +H2S
It is very soluble and forms a tetrahydrate, Ca(NO3)
2·4H2O if the solution is evaporated to dryness.
The CAS number of the anhydrate is 10124-37-5 while
that of the tetrahydrate is 13477-34-4. As with the beryllium
nitrate salts, variation of the nitric acid concentration
affects the type of hydrate produced. The
trihydrate is known (CAS number 10124-37-5) but not
the monohydrate. The anhydrate is a white cubic crystal
that is hygroscopic; its density is 2.504 g/cm3 and it
melts at 561°C. This salt is highly soluble in water and
also dissolves in alcohols and acetone. The tetrahydrate
melts in its own waters of hydration at 42.7°C and loses
4H2O molecules at 132°C. It decomposes to form
nitrogen oxides and CaO similar to the behavior of the
other alkaline earth nitrates. The anhydrous salt is
soluble at 121.2 g/100 ml at 20°C and 271.2 g/100 ml
at 40°C.
化学的特性
White, deliquescent mass. Soluble in water,
alcohol, and acetone.
物理的性質
White cubic crystal; hygroscopic; density 2.50g/cm
3; melts at 561°C; highly soluble in water; also dissolves in alcohols and acetone.
使用
Calcium nitrate is mainly used
as a component in fertilizers. Nitrocalcite is the name
for a mineral which is a hydrated calcium nitrate that forms as an efflorescence in places where manure
contacts limestone (or concrete) in a dry environment
such as caverns or stables.Calcium nitrate is used in explosives, matches and
pyrotechnics. Other applications are in the manufacture
of incandescent mantle; and as an additive to diesel fuel
for corrosion inhibition.This calciumnitrate is useful
as an oxidizer but its hygroscopic nature, results in
extreme deliquescence in air. Calcium nitrate is mainly used as a flocculent in
rubber latex and in refrigerant manufacture. And it
is also employed in oil exploratory wells and sewage
treatment. In agriculture, it is used in hydroponic
culture and as a fast-effective fertilizer for acid soil.
It can also be used to make fireworks, to produce
explosives in national defense industry, and to paint
negative poles in the electronic instrument industry.
It is also a raw material in making other nitrates. It
is this usage that calcium nitrate finds most of its
employment in industry, other than its use in
agriculture.
Calcium nitrate is a strong oxidizing agent. Mixing
it with organic substances such as fuel oil or hydrocarbons
or other oxidizable compounds can cause an
explosion.
Calcium nitrate has been evaluated as a component
for heat storage devices.
定義
calcium nitrate: A white deliquescentcompound, Ca(NO
3)
2, that isvery soluble in water; cubic; r.d. 2.50;m.p. 561°C. It can be prepared byneutralizing nitric acid with calciumcarbonate and crystallizing it fromsolution as the tetrahydrateCa(NO
3)
2.4H
2O, which exists in twomonoclinic crystalline forms (α, r.d.1.9; β, r.d. 1.82). There is also a trihydrate,Ca(NO
3)
2.3H
2O. The anhydroussalt can be obtained from the hydrateby heating but it decomposeson strong heating to give the oxide,nitrogen dioxide, and oxygen. Calciumnitrate is sometimes used as anitrogenous fertilizer.
製造方法
Calcium nitrate may be prepared by the reaction of nitric acid with calcium carbonate or calcium sulfide:
CaCO
3 + 2HNO
3 →Ca(NO
3)
2 + CO + H2O
CaS + 2HNO
3 →Ca(NO
3)
2 + H2S
一般的な説明
White to light gray granular solid. May be either the anhydrous compound or the tetrahydrate. Used in fertilizers, explosives and pyrotechnics.
空気と水の反応
Deliquescent. Water soluble.
反応プロフィール
An oxidizing agent. Noncombustible but accelerates the burning of combustible materials. If large quantities are involved in the fire or the combustible material is finely divided an explosion may result. Prolonged exposure to fire or heat may result in an explosion. May explode if shocked or heated [Hawley]. Heating causes release of toxic oxides of nitrogen. Mixtures with alkyl esters may explode owing to the formation of alkyl nitrates; mixtures with phosphorus, tin(II) chloride, or other reducing agents may react explosively [Bretherick 1979 p. 108-109].
危険性
Strong oxidizer, dangerous fire risk in con-
tact with organic materials, may explode if shocked
or heated.
健康ハザード
Dust causes mild irritation of eyes.
农业用途
Calcium nitrate [Ca(NO
3)
2], also known as lime nitrate,
nitrocalcite, lime saltpeter and Norwegian saltpeter,
was the first chemical nitrogenous fertilizer to be
marketed.
Calcium nitrate fertilizer absorbs considerable
amount of water, which makes it somewhat difficult to
handle. It contains 15 % nitrogen and 21 % calcium. In a
prilled form, it becomes suitable for bulk mixing and the
powdered form is useful in sprays.
Calcium nitrate controls the blossom-end rot of
tomatoes and is used in Europe as a major source of
nitrogen.
Calcium nitrate used on saline soils displaces sodium
with calcium. In addition, calcium nitrate is a non-acid
forming fertilizer and improves physical properties of
acidic and exhausted soils. However, its advantage as a
fertilizer is offset by its extreme hygroscopic nature. This
calls for its production in air-conditioned plants and the
use of sealed moisture proof bags.
Calcium nitrate, in addition to its usage as a fertilizer,
finds application in explosives, pyrotechnics, and
inorganic chemical operations.
安全性プロファイル
A poison by ingestion.
An irritant. A strong oxidant. Forms powerfully explosive mixtures with aluminum +
ammonium nitrate + formamide + water,
ammonium nitrate + hydrocarbon oils,
ammonium nitrate + water-soluble fuels,
and organic materials. When heated to
decomposition it emits toxic fumes of NOx.
See also NITRATES and CALCIUM
COMPOUNDS.
硝酸カルシウム 上流と下流の製品情報
原材料
準備製品