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About Calcium Hydride CaH2 Powder:
CaH2 Powder, What is the name of CaH2? The chemical name for CaH2 is Calcium hydride. Calcium hydride (CaH2) is a Gray-white crystal or blocky, extremely deliquescent, used as a reducing agent, desiccant, chemical analysis reagent, etc.; also colorless orthorhombic crystal; industrial products are gray, orthorhombic, or powder. What type of bond is calcium hydride? Ionic hydrides react vigorously with water by removing hydrogen gas (H2). Compounds that have hydrogen and one other element only are called binary hydrides with the general form of MH or MH2 such as sodium hydride (NaH), lithium hydride (LiH), calcium hydride (CaH2), magnesium hydride (MgH2). Sensitive to moisture. Kmpass is a trusted global Calcium Hydride supplier. It does not react with dry air, nitrogen, or chlorine at normal temperature, but reacts with the above gas at high temperature to form calcium oxide, calcium carbide and calcium chloride, respectively. When water is decomposed and hydrogen is released, it can also react with ethanol to form hydrogen and calcium glycolate. Feel free to send an inquiry about the latest price of Calcium Hydride at any time. The reduction of metal oxides is more intense than sodium hydride or lithium hydride.
Here are some basic physical and chemical properties of this compound:
Appearance: This compound is white in its pure form; however, it usually appears as a grey powder.
Odor: It is odorless.
Solubility: This powder reacts violently with water to produce hydrogen. It also reacts in alcohol.
Molar Mass: The molars mass of this material is 42.094 g/mol.
Specific Gravity: Its specific gravity is 1.9.
Melting Point: It has a melting point of 816 °C.
Density: Its density is 1.70 g/ cm3.
Disadvantages of Using Calcium Hydride:
This chemical compound is often the preferred choice for drying agent; however, it also has some disadvantages:
The drying action of this compound is slow as it is not soluble in any solvent with which it does not react violently.
This powdered compound is incompatible with many solvents. Its reaction with chlorocarbons can even result in explosions. Why is calcium hydride called Hydrolith? Calcium hydride is called hydrolith because CaH2 is a saline hydride, meaning that its structure is salt-like. The alkali metals and the alkaline earth metals all form saline hydrides.
It cannot be used for deoxygenating solvents as it is unable to remove dissolved oxygen.
Differentiating between Calcium Hydride and Calcium hydroxide is quite difficult because of their similar appearances.
How is Calcium Hydride CaH2 Powder produced?
The specific steps for making calcium hydride are as follows:
1. Put refined calcium with a purity of about 99.5% into the iron plate and place it in the center of the quartz reaction tube. Install the water inlet pipe and the water outlet pipe with rubber plugs at both ends of the quartz reaction tube, and purify the hydrogen gas through the water inlet pipe, and connect the water outlet pipe to the fume hood through a mineral oil bubbler. What happens when calcium hydride reacts with water? Calcium hydride (CaH2) reacts vigorously with water, liberating hydrogen gas. The activation of energy of the hydrolysis reaction of CaH2 in an ethanol solution (Ea = 20.03 kJ/mol) was found to be less than the other reactions. The reaction tube is heated with an electric furnace. After the purified hydrogen, a large amount of hydrogen is introduced at the beginning to replace the air in the reaction system and then heated with an electric furnace. The reaction started at about 200°C and was further heated to 250-300°C, and hydrogen was introduced at a flow rate of 0.6 ml/min. The reaction can be completed in about 2 hours. The calcium hydride produced is a porous off-white crystalline powder, and the purity of the calcium hydride is about 99%.
2. Alkaline earth metal and pure electrolytic hydrogenation can produce alkaline earth metal hydride. The hydrogenation device for preparing CaH 2 is the same as the device for preparing alkali metal hydride. In order to purify metallic calcium, vacuum distillation needs to be repeated, and then the oxide layer on the calcium surface is scraped off in an operation box filled with argon and cut into small pieces as much as possible. Under the condition of isolating air, the surface is smooth and clean. Small metal calcium is contained in a boat made of electrolytic iron, and the boat is contained in a quartz tube. The heating part of the quartz tube is covered with a thin-walled tube made of electrolytic iron to prevent the quartz tube from being corroded by calcium vapor. Pure hydrogen is introduced, the calcium is heated to 400-500°C to start the hydrogenation reaction, and then the temperature is increased to 1000°C. After the reaction is completed, calcium hydride is obtained by cooling to room temperature. Method to check whether the hydrogenation reaction is complete: You can use a petroleum ether bubbler to check. Pause H2. If the liquid level of the bubble tube does not rise, the reaction is complete. If the liquid level in the conduit rises, it indicates that the hydrogenation reaction still needs to continue.
Application of Calcium Hydride CaH2 Powder:
CaH2 Powder widely used in powder metallurgy, with zirconium, niobium, hafnium and other metal oxides reduction, and get the corresponding metal powder. CaH2 Powder also can be used as a light hydrogen generating agent for dehydration, hydrogenation, condensing or desiccant of organic compounds. What is calcium hydride used for?
Its use is safer than more reactive agents such as sodium metal or sodium-potassium alloy. Calcium hydride is widely used as a desiccant for basic solvents such as amines and pyridine. It is also used to dry alcohol.
Uses of calcium hydride
The compound has two main uses: one is used as a desiccant, and the other is used to generate hydrogen.
Use of calcium hydride as a desiccant
It is a relatively mild desiccant. For this reason, it is safer to use this compound as a desiccant compared to more reactive reagents such as sodium-potassium alloy and sodium metal. It reacts with water in the following ways:
CaH2 + 2 H2O→Ca(OH)2 + 2 H2
The hydrolysis products of this reaction—hydrogen (gas) and Ca(OH)2 (aqueous mixture)—can be separated from chemical solvents by filtration, distillation, or decantation.
This compound is an effective desiccant for many alkaline solvents such as amines and pyridine. Sometimes used for pre-drying of solvents before using more reactive desiccants.
Use of calcium hydride for hydrogen production
In the 1940s, this compound was obtained under the trade name “Hydrolith” as a hydrogen source. It has been used as a hydrogen source for a long time. In various experiments, it is still used in the laboratory to produce pure hydrogen.
In addition to these two uses, the powdered compound is also used as a strong reducing agent.
Storage Condition of Calcium Hydride CaH2 Powder:
The damp reunion will affect CaH2 powder dispersion performance and using effects, therefore, Calcium Hydride CaH2 Powder should be sealed in vacuum packing and stored in a cool and dry room, the Calcium Hydride CaH2 Powder can not be exposure to air. In addition, the CaH2 powder should be avoided under stress.
Packing & Shipping of Calcium Hydride CaH2 Powder:
We have many different kinds of packing which depend on the Calcium Hydride CaH2 Powder quantity.
Calcium Hydride CaH2 Powder packing: vacuum packing, 100g, 500g or 1kg/bag, 25kg/barrel, or as your request.
Calcium Hydride CaH2 Powder shipping: could be shipped out by sea, by air, by express, as soon as possible once payment receipt.
Calcium Hydride Properties | |
| Other Names | calcium(II) hydride, calcium(2+) dihydride, HyH2 powder |
| CAS No. | 7789-78-8 |
| Compound Formula | CaH2 |
| Molecular Weight | 42.09 |
| Appearance | White to Gray Powder |
| Melting Point | 600℃ |
| Boiling Point | N/A |
| Density | N/A |
| Solubility in H2O | Reacts violently |
| Exact Mass | 41.978241 |
Calcium Hydride Health & Safety Information | |
| Signal Word | Warning |
| Hazard Statements | H260 |
| Hazard Codes | F |
| Risk Codes | 15 |
| Safety Statements | 24/25-43-7/8 |
| Transport Information | UN 1404 4.3/PG I |