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CALCIUM HYDRIDE

Alkaline earth metal Toxicity Chemical Properties Uses Production method Category Explosive hazardous characteristics Storage Characteristics Extinguishing agent
CALCIUM HYDRIDE
CALCIUM HYDRIDE
CAS No.
7789-78-8
Chemical Name:
CALCIUM HYDRIDE
Synonyms
CaH2;Hydrolete;Hydrolith;Cakium hydride;CALCIUM HYDRIDE;Dihydridecalcium;Calciumhydridemm;Calciumhydridemesh;Calciumhydride,95%;calciumhydride(cah2)
CBNumber:
CB0115234
Molecular Formula:
CaH2
Formula Weight:
42.09
MOL File:
7789-78-8.mol

CALCIUM HYDRIDE Properties

Melting point:
190 °C(lit.)
Density 
1.9
storage temp. 
Store at RT.
form 
powder
color 
Light gray
Specific Gravity
1.9
Water Solubility 
Soluble in water and alcohol. Insoluble in benzene.
Sensitive 
Moisture Sensitive
Merck 
14,1672
Stability:
Stable, but reacts violently with water, liberating and igniting hydrogen. Contact with strong oxidizers may cause fire or explosion. Incompatible with strong oxidizing agents, strong acids, halogens, water, alcohols.
InChIKey
FAQLAUHZSGTTLN-UHFFFAOYSA-N
CAS DataBase Reference
7789-78-8(CAS DataBase Reference)
NIST Chemistry Reference
calcium hydride(7789-78-8)
EPA Substance Registry System
Calcium hydride (CaH2)(7789-78-8)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  F
Risk Statements  15
Safety Statements  24/25-43-7/8-43A
RIDADR  UN 1404 4.3/PG 1
WGK Germany  1
TSCA  Yes
HazardClass  4.3
PackingGroup  I
HS Code  28500090
Symbol(GHS):
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H260 In contact with water releases flammable gases which may ignite spontaneously Substances And Mixtures Which, In Contact With Water,Emit Flammable Gases Category 1 Danger P223, P231+P232, P280, P335+ P334,P370+P378, P402+P404, P501
Precautionary statements:
P223 Keep away from any possible contact with water, because of violent reaction and possible flash fire.
P231+P232 Handle under inert gas. Protect from moisture.
P370+P378 In case of fire: Use … for extinction.
P402+P404 Store in a dry place. Store in a closed container.

CALCIUM HYDRIDE price More Price(25)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 208027 Calcium hydride reagent grade, 95% (gas-volumetric) 7789-78-8 5g $42.5 2018-11-13 Buy
Sigma-Aldrich 208027 Calcium hydride reagent grade, 95% (gas-volumetric) 7789-78-8 100g $125 2018-11-13 Buy
Alfa Aesar 019106 Calcium hydride, 90-95% 7789-78-8 25g $27.6 2018-11-16 Buy
Alfa Aesar 019106 Calcium hydride, 90-95% 7789-78-8 100g $72.1 2018-11-16 Buy
Strem Chemicals 20-2021 Calcium hydride, min. 97% 7789-78-8 50g $44 2018-11-13 Buy

CALCIUM HYDRIDE Chemical Properties,Uses,Production

Alkaline earth metal

Calcium hydride is an alkaline earth metal hydride, although it is not stable than lithium hydride, but stable than other alkali metal borohydride. Chemical formula is CaH2. Molecular weight is 42.10. It is white monoclinic crystals or lumps. Industrial is gray. When exposed to moist air hydrogen will release, and calcium hydroxide will leave. The proportion of is 1.9. The decomposition tempreture is about 600℃. Melting point is 816℃ (hydrogen). When meet water, carboxylic acids, lower alcohols, it can decompose to generate hydrogen. The decomposition When tempreture get 600℃, it begins to decompose. At room temperature, it can not react with dry oxygen, nitrogen, chlorine, but can react at high temperatures. This reaction can generate CaO, Ca3N2, CaCl2, respectively. At room temperature, it can react with water and the product is calcium hydroxide and hydrogen.
Calcium hydride has a strong reduction, and can make the metal liberate from the metal oxides, metal chlorides, for example,
2CaH2 + MO2→ 2CaO+2H2 + M (metal).
Calcium hydride can be used for strong reducing agent commonly, as well as used to make hydrogen when work in the field.
Preparation: The calcium metal is charged in the wok, and it can react with hydrogen to generate calcium hydride when temperature get about 300℃ with electric or oil.
Ca + H2 → CaH2 + 214kJ·mol-1
Or in a stream of hydrogen, magnesium can reduce calcium oxide reduction to get calcium hydride, due to the separation of calcium oxide is difficult, high purity calcium hydride products can not obtain.
CaO + Mg + H2 → CaH2 + MgO
Purpose: When be heated to 600 ~1000 ℃, the oxide of zirconium, niobium, uranium and chromium can be reduced to prepare powder of these metals, so calcium hydride can be used in powder metallurgy. It can be insoluble in ether, can react with ethanol to produce hydrogen and ethanol calcium. Hydrogen can be obtained by the reaction of water, one gram of the product in the water can release one liter of hydrogen, so it is often used as a portable source of hydrogen. In addition, calcium hydride is also used dehydration of organic compounds, hydrogenation, condensation agent; or as a drying agent, the drying effect is better than sodium, phosphorus pentoxide.
The above information is edited by the chemicalbook of Wang Xiaodong.

Toxicity

When meet moisture, water or acids, hydrogen can be released and can cause combustion, it can react with oxidants and metal oxides violent. Dust can cause strong stimulating effect for the eyes, nose, skin and respiratory system. The product of calcium hydroxide is strong corrosive when meet moisture.
Other reference lithium hydride.

Chemical Properties

It is colorless orthorhombic crystallization; gray goods, orthorhombic or powder. It is sensitive to moisture. The relative density is 1.90. Melting point is 816℃ (in hydrogen). It can decompose to Ca and H2 at 600℃. With water it can decompose and release hydrogen at the same time, it can also generate hydrogen and ethanol calcium when react with ethanol. The reduction of metal oxides is more strongly than sodium hydride or lithium hydride.

Uses

It can be used as reducing agent and a condensing agent in organic synthesis, and desiccant in producing hydrogen material.

Production method

The purity of about 99.5% purified calcium is put into the iron plate, then put on the central quartz reaction tube, at both ends of the quartz reaction tubes are installed into the trachea and a tube with rubber stopper, the purification of hydrogen go through from the intake pipe, the trachea is contact with by mineral oil bubbler and fume hood. The reaction tubes is electric heating. At beginning, raction air in the system is replaced by large purified hydrogen, then heated by an electric furnace. The reaction starts from about 200℃, further heated to 250~300℃, then a flow rate of 0.6 m 1/ min of hydrogen gas introduce into the reaction, the reaction needs about 2h to complete, the product of calcium hydride is porous white crystalline powder, the purity of calcium hydride is about 99%.
Ca + H2 → CaH2

Category

Explosive substances.

Explosive hazardous characteristics

When the reaction was heated with tetrahydrofuran, it can cause explosion; when mix with potassium chlorate, hypochlorite, bromate, perchlorate, it is heat sensitive, friction sensitive and explosive.

Storage Characteristics

Treasury need ventilation low temperature drying; shockproof, moistureproof, against high temperature.

Extinguishing agent

Foam, carbon dioxide, dry powder.

Chemical Properties

greyish-white solid

Uses

To prepare rare metals by reduction of their oxides; as a drying agent for liquids and gases; to generate hydrogen: 1 g of calcium hydride in water liberates 1 liter of hydrogen at STP; in organic syntheses.

General Description

Grayish-colored lump or crystalline solid. Irritating to skin and eyes. Used to make other chemicals.

Air & Water Reactions

Ignites in air or reacts violently, sometimes explosively, with air of high humidity [Bretherick 1979 p. 107]. Reacts exothermically with water to generate flammable hydrogen gas and calcium hydroxide, a base. [Merck, 11th ed. 1989].

Reactivity Profile

When silver fluoride is ground with CALCIUM HYDRIDE the mass becomes incandescent [Mellor 3:389 1946-47]. Heating the hydride strongly with chlorine, bromine, or iodine leads to incandescence. Mixtures of the hydride with various bromates, i.e. barium bromate; chlorates, i.e. barium chlorate, and perchlorates, i.e. potassium perchlorate; explode on grinding, [Mellor, 1946, vol. 3, 651]. CaH2 reacts incandescently with AgF if subject to friction. (Mellor, 1941, Vol. 3, 389, 651).

Hazard

Evolves highly flammable hydrogen when wet; solid product is slaked lime. Irritating to skin.

Health Hazard

Inhalation or contact with vapors, substance or decomposition products may cause severe injury or death. May produce corrosive solutions on contact with water. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.

Fire Hazard

Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.

CALCIUM HYDRIDE Preparation Products And Raw materials

Raw materials

Preparation Products


CALCIUM HYDRIDE Suppliers

Global( 161)Suppliers
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Henan DaKen Chemical CO.,LTD.
+86-371-55531817
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Henan Tianfu Chemical Co.,Ltd.
0371-55170693
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Mainchem Co., Ltd.
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hebei chisure biotechnology co.,ltd
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Hebei Daohui Chemical Co.,LTD +86 18612009158
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Shanghai Macklin Biochemical Co.,Ltd. 15221275939
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J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
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Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) sh@meryer.com China 40395 62
3B Pharmachem (Wuhan) International Co.,Ltd. 86-21-50328103 * 801、802、803、804 Mobile:18930552037
86-21-50328109 3bsc@sina.com China 15926 69
Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 saleschina@alfa-asia.com China 30291 84

View Lastest Price from CALCIUM HYDRIDE manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-10-08 Hot selling Calcium Hydride 98% Factory price CAS No.:7789-78-8
7789-78-8
US $10.00-90.00 / KG 1KG 99% 1000kg/month hebei chisure biotechnology co.,ltd

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