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What is Calcium hydride?

wallpapers News 2021-11-23
What is Calcium hydride?
Calcium hydride is an inorganic substance with a chemical formula of CaH2 and a molecular weight of 42.10. Grayish-white crystals or lumps, easily deliquescent, used as reducing agents, desiccants, chemical analysis reagents, etc.; it is also a colorless orthorhombic crystal; industrial products are gray, orthorhombic, or powder. Sensitive to moisture. It does not react with dry air, nitrogen, or chlorine at room temperature, but can react with the above gases at high temperatures to generate calcium oxide, calcium nitride, and calcium chloride, respectively. When it meets water, it decomposes and releases hydrogen at the same time. It can also react with ethanol to produce hydrogen and calcium ethoxide. The reduction effect on metal oxides is stronger than sodium hydride or lithium hydride.
What are the specific uses of calcium hydride?
Calcium hydride is used in powder metallurgy. When heated to 600-1000°C, it can be reduced with metal oxides such as zirconium, niobium, and hafnium to obtain corresponding metal powders. At the same time, it can also be used as a portable hydrogen generator, as well as a reducing agent, desiccant, and analytical reagent.
How to synthesize calcium hydride?
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 air inlet and outlet pipes with rubber plugs at both ends of the quartz reaction tube. The inlet pipe is passed through to purify hydrogen, and the outlet pipe is passed through mineral oil. The bubbler is connected to the fume hood. The reaction tube is heated with an electric furnace. After the purified hydrogen, a large amount of hydrogen is introduced to replace the air in the reaction system at the beginning and then heated with an electric furnace. The reaction starts at about 200°C and is further heated to 250-300°C. The hydrogen is fed in 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%.
Alkaline earth metals can be hydrogenated with pure electrolytic hydrogen to produce alkaline earth metal hydrides. The hydrogenation device for preparing CaH2 is the same as the device for preparing alkali metal hydride. To purify metallic calcium, it is necessary to perform vacuum distillation repeatedly, and then scrape off the oxide layer on the calcium surface in an operation box filled with argon, and cut it into small pieces as much as possible. In the case of air isolation, the surface is smooth and clean. Small pieces of metallic calcium are packed in a boat made of electrolytic iron, and the boat is packed into a quartz tube. The heated 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, the hydrogenation reaction starts, and then the temperature is increased to 1000°C, after the reaction is completed, the calcium hydride is obtained by cooling to room temperature. The method to check whether the hydrogenation reaction is complete: a petroleum ether bubbler can be used to check. Suspend H2. If the liquid level of the bubbler 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.
Calcium hydride Supplier
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years of experience in providing super high-quality chemicals and Nanomaterials. Currently, our company has successfully developed a series of materials. The Calcium hydride produced by our company has high purity, fine particle size, and impurity content. For the latest price of calcium hydride, send us an email or click on the needed products to send an inquiry.
 
 

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