水酸化マグネシウム 化学特性,用途語,生産方法
外観
白色の粉末
定義
本品は、マグネシウムの水酸化物であり、次の化学式で表される。
溶解性
水に難溶 (0.0009g/100g 18℃).。うすい塩酸に溶けやすく、水にほとんど溶けない。水及びエタノールにほとんど溶けない。
解説
水酸化マグネシウム，天然には水滑石(ブルース石)として産出する．酸化マグネシウムと水との反応，またはマグネシウム塩の水溶液にアルカリを加えると得られる．白色の粉末．密度2.36 g cm－3．350 ℃ で水を放ち酸化マグネシウムを生じる．水に難溶，アンモニウム塩水溶液に可溶．酸に溶けてマグネシウム塩を生じる．水溶液はアルカリ性で，二酸化炭素を吸収して炭酸水酸化物塩MgCO3･Mg(OH)2を生じる．パルプの製造，排煙脱硫剤，中和剤，難燃剤，ガラス添加剤，フェライト原料，肥料，医薬品(制酸剤，下剤)などに用いられる．
用途
セラミック原料、樹脂添加剤、触媒、半導体。
用途
セラミックス焼結助剤、各種セラミックス原料。
用途
難燃剤、吸着剤、肥料、医薬品原料、マグネシウム塩製造原料。
用途
耐火煉瓦の原料
化粧品の成分用途
pH調整剤、不透明化剤、緩衝剤、吸着剤、増量剤
効能
制酸薬, 緩下剤
商品名
ミルマグ (エムジーファーマ); ミルマグ (エムジーファーマ); ミルマグ (エムジーファーマ)
使用上の注意
純度は金属ベースで差数法によって算出したもので、重量又は容量分析等の化学的方法によるものではありません。使用目的により、正確な含量が必要な場合は、それらの方法によって測定する必要があります。
説明
A white, bulky powder. It dissolves in dilute acids, but is practically insoluble in water and in alcohol.
化学的特性
Magnesium hydroxide, Mg(OHn, also known as magnesium hydrate and brucite, is a white powder that is very slightly soluble in water. It decomposes at 350°C (662 OF). It is used in the extraction of magnesium metal and as a reagent in the sulfite wood pulp process. Magnesium hydroxide is formed by the reaction of sodium hydroxide and a soluble magnesium salt solution. Brucite, a mineral composed of magnesium hydroxide with occasional traces of iron and manganese, is a white to grayish translucent secondary mineral found with serpentine and metamorphic dolomites.
物理的性質
Magnesium Hydroxide decomposes when heated to 360°C and forms
the oxide, MgO. It is very slightly soluble in water at
0.00122 g/100 ml and has a solubility product of
5.61×10
-12. Crystals of Mg(OH)2 have a refractive
index of 1.559. Its heat of formation is –925 kJ/mol
with an entropy of 63 J/mol·K.
As a suspension in water, it is often called milk of
magnesia because of its milk-like appearance. The solid
mineral form of magnesium hydroxide is known as
“brucite”.
It can be prepared by the metathesis reaction
between any soluble magnesium salts and an alkali
hydroxide such as sodium or even ammonium:
Mg
2+(aq)＋2OH
-(aq)→Mg(OH)2(solid)
Magnesium hydroxide is a common component of
antacids and laxatives. It interferes with the absorption
of folic acid and iron. Its low solubility makes it a weak base.
Another method of commercial manufacture of
magnesium hydroxide involves the chloride obtained from seawater. After the chloride is recrystallized
several times to obtain a level of purity, it is calcined at
about 1000°C:
MgCl2·6H2O → MgCl2＋6H2O
→ Mg(OH)
-xCl2
-x＋xHCl
→ MgO＋(2－x)HCl
天然物の起源
Magnesium Hydroxide occurs naturally as the mineral brucite. Brucite, usually found as a low temperature, hydrothermal vein mineral associated with calcite, aragonite, talc, or magnesite, appears as a decomposition product of magnesium silicates associated with serpentine, dolomite, magnesite, and chromite. Brucite also occurs as a hydrated form of periclase, and is found in serpentine, marble, chlorite schists, and in crystalline limestone.
使用
Magnesium Hydroxide is an alkali that is a general purpose food
additive. it exists as a white powder and has poor solubility in water
and in alcohol. in frozen desserts it will increase the tendency for fat
globules to clump, which results in an increase in dryness. it reacts
with triglycerides in fatty acids to form soaps. it also functions as a
drying agent in foods.
定義
ChEBI: A magnesium hydroxide in which the magnesium atom is bound to two hydroxide groups.
応用例（製薬）
The synthesis of magnesium hydroxide [Mg(OH)
2]
is based on a metathesis reaction in which magnesium salts are reacted with sodium or potassium hydroxide.
Magnesium hydroxide (Mg(OH)
2) has only limited solubility
in water and the resulting suspension is called milk of magnesia, which is commonly used as an antacid and is
known to be a mild base.
Magnesium hydroxide [Mg(OH)
2] is present in antacids because of its laxative properties and is also the
main ingredient of the ‘milk of magnesia’. The ‘milk of magnesia’ is a suspension of Mg(OH)
2 in water,
which has a milk-like appearance because of the low aqueous solubility of Mg(OH)
2. It is considered as a
strong electrolyte and a weak base and is given to the patient for indigestion and heartburn. The alkaline
suspension neutralises any excess stomach acid and therefore works as an antacid. It also stimulates intestinal
movement, as the magnesium ions increases the water content in the intestines through its osmotic effect and
as a result softens any faeces present.
安全性プロファイル
Moderately toxic by
intraperitoneal route. Human systemic
effects: chlorine level changes, coma,
somnolence. Incompatible with maleic
anhydride, phosphorus. See also
MAGNESIUM COMPOUNDS.
水酸化マグネシウム 上流と下流の製品情報
原材料
準備製品