Calcium hydride (CaH2)

Base Information Edit

Chemical Name:Calcium hydride (CaH2)
CAS No.:7789-78-8
Deprecated CAS:57308-10-8,2365323-97-1
Molecular Formula:CaH2
Molecular Weight:42.0939
Hs Code.:28500090
DSSTox Substance ID:DTXSID60894886
Mol file:7789-78-8.mol

Synonyms:Calcium hydride (CaH2);calcium;hydride;CaH2;UNII-WY779SQ0XW;HSDB 8095;DTXSID60894886;EINECS 232-189-2;AKOS015951413;Calcium hydride [UN1404] [Dangerous when wet]

Suppliers and Price of Calcium hydride (CaH2)

Supply Marketing:Edit

Business phase:: The product has achieved commercial mass production^*data from LookChem market partment

Manufacturers and distributors:

Manufacture/Brand
Chemicals and raw materials
Packaging
price

TRC
Calcium hydride
50g
$ 65.00

Strem Chemicals
Calcium hydride, 95%
50g
$ 48.00

Strem Chemicals
Calcium hydride, min. 97%
50g
$ 47.00

Strem Chemicals
Calcium hydride, 95%
250g
$ 195.00

Strem Chemicals
Calcium hydride, min. 97%
250g
$ 185.00

Sigma-Aldrich
Calcium hydride powder, 0-2 mm, reagent grade, ≥90% (gas-volumetric)
500g
$ 399.00

Sigma-Aldrich
Calcium hydride reagent grade, 95% (gas-volumetric)
500g
$ 364.00

Sigma-Aldrich
Calcium hydride 99.9% trace metals basis
10g
$ 297.00

Sigma-Aldrich
Calcium hydride purum p.a., ≥97.0% (gas-volumetric), powder
100 g
$ 273.00

Sigma-Aldrich
Calcium hydride purum p.a., ≥97.0% (gas-volumetric), powder
100g-f
$ 264.00

Total 63 raw suppliers

Chemical Property of Calcium hydride (CaH2) Edit

Chemical Property:

Appearance/Colour:greyish-white solid
Melting Point:190 °C(lit.)
Boiling Point:1484oC
PSA：0.00000
Density:1.9
LogP:0.22500
Storage Temp.:Store at RT.
Sensitive.:Moisture Sensitive
Water Solubility.:Soluble in water and alcohol. Insoluble in benzene.
Hydrogen Bond Donor Count:0
Hydrogen Bond Acceptor Count:2
Rotatable Bond Count:0
Exact Mass:41.9782409
Heavy Atom Count:1
Complexity:0

Purity/Quality:

99% ^*data from raw suppliers

Calcium hydride ^*data from reagent suppliers

Safty Information:

Pictogram(s): F
Hazard Codes:F
Statements: 15
Safety Statements: 24/25-43-7/8-43A

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

Canonical SMILES:[H-].[H-].[Ca+2]
Uses It can be used as reducing agent and a condensing agent in organic synthesis, and desiccant in producing hydrogen material. Calcium hydride is used as an efficient drying agent for aprotic base-stable solvents like ethers and tertiary amines. It is a useful dehydrating agent in a synthesis of aldehyde enamines in high yield and purity. Calcium hydride is a relatively mild desiccant. It is safer than the more reactive agents such as sodium metal. Calcium hydride is widely used as a desiccant for basic solvents such as amines and pyridine in organic syntheses. It is also used to pre-dry solvents prior to the use of a more reactive desiccant. The compound has, however, been widely used for decades as a safe and convenient means to inflate weather balloons. Likewise, it is regularly used in laboratories to produce small quantities of highly pure hydrogen for experiments. 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.
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
Description Calcium hydride is a gray powder (white if pure, which is rare). It reacts vigorously with water liberating H2 gas. CaH2 is thus used as a drying agent, i.e. a desiccant. It is prepared directly from the metal or by reacting CaCO3 with hydrogen at elevated temperatures. The overall reaction is shown as follows: CaCO3＋heat＋H2→CaH2＋H2O＋CO2 CaH2 is a saline hydride, meaning that its structure is salt-like. The alkali metals and the alkaline earth metals all form saline hydrides. These species are insoluble in all solvents with which they do not react because they have extended structures. CaH2 crystallizes in the PbCl2 structural pattern. The reaction of CaH2 with water can be represented as follows: CaH2＋2H2O0Ca(OH)2＋2H2 The two hydrolysis products, H2, a gas, and Ca(OH)2, an aqueous mixture of solid plus liquid (i.e. a slurry), are readily separated from the solvent by distillation, filtration, or decantation.
Physical properties Grayish orthorhombic crystal or powder; stable at ambient temperature; density 1.70 g/cm3; melts at 816°C; reacts with water and alcohol.

Technology Process of Calcium hydride (CaH2)

There total 44 articles about Calcium hydride (CaH2) which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield: 99.6%

: 1333-74-0
hydrogen

: 7440-70-2
calcium

: 7789-78-8
calcium hydride

Guidance literature:: In melt; High Pressure; Ca melted in vac. at 350°C for 5 h, filled with H2 (5 atm) at 400°C for 5 min, at 10 atm. at 480°; elem. anal.;
DOI:10.1023/B:RJAC.0000044107.80122.61