Product name :【 Lithium Hydride】

Molecular formula: LiH Molecular weight: 7.95

Technical index:

Appearance: white or light blue transparent block or powder

Granularity: the finest can reach 100 mesh (≥0.15m)

Purity: ≥96%

Nature:

Specific gravity 0.82; melting point 680°C, slightly soluble in ether, insoluble in benzene, toluene and other non-polar organic solvents. It is stable in dry air or oxygen at room temperature; powdered lithium hydride may ignite spontaneously in very humid air, but block lithium hydride will not burn even if it is put in excessive water, but the reaction is very violent; lithium hydride can interact with Alcohols react gently to generate lithium alcoholate and hydrogen.

Uses: In organic synthesis, it can be used as a condensing agent, reducing agent, alkylating agent, Claisen's reagent, and as a desiccant.

Physical and chemical constants

National standard number 43016

CAS number 7580-67-8

Chinese name Lithium hydride

English name lithium hydride

Alternative name lithium monohydride

Molecular formula LiH

Appearance and properties White or bluish-gray translucent crystal or powder, very deliquescent

Molecular weight 7.95 Boiling point 850℃ (decomposition)

melting point 680℃

Solubility Insoluble in water, benzene, toluene, soluble in ether

Electrolytic electrolyte, there are freely moving H- and Li+ ions in the liquid state, which can conduct electricity

Density Relative density (water=1) 0.82

stability very stable

Hazard Mark 10 (Inflammable materials when wet) Main purpose: Used as desiccant, organic synthesis condensation agent, nuclear protection material and reducing agent, etc.

the effect on the environment

Health hazard

Invasion route: inhalation, ingestion.

health hazards: strong irritation and corrosion to the skin and mucous membranes. After inhalation, it can cause sneezing, coughing, breathing difficulties, and bronchitis. Can cause perforation of the nasal septum. Eye contact can cause conjunctivitis or burns. Can cause skin burns. Oral poisoning may cause weakness, dizziness, blurred vision, nausea, vomiting, etc., in severe cases, confusion, convulsions or mental disorders.

Toxicological information and environmental behavior

Hazard characteristics: The chemical reaction is very active, and it can ignite spontaneously when exposed to the air. When heated or in contact with moisture or acids, it emits heat and hydrogen, causing combustion and explosion. It can react strongly with oxidants, causing combustion or explosion. Hydroxide is formed when encountering humidity and moisture, which is very corrosive.

Combustion (decomposition) products: lithium oxide, water.

Laboratory monitoring methods

Measurement in the air: the sample is collected with a filter, and then analyzed by atomic absorption spectrometry (NIOSH method)

Gas Chromatography, refer to "Handbook of Analytical Chemistry" (Fourth Volume, Chromatography Analysis), Chemical Industry Press

Environmental standards

U.S. Plant Sanitary Standard 0.025mg/m3

Emergency treatment methods

Leakage emergency treatment

Isolate the leaked contaminated area and restrict access. Cut off the fire source. It is recommended that emergency handlers wear self-priming filter dust masks and wear anti-acid and alkali overalls. Do not directly touch the leakage. A small amount of leakage: avoid dust, use non-sparking tools to collect in a dry, clean, covered container. Move to a safe place. A large amount of leakage: Cover with plastic sheet and canvas to reduce scattering. Contact the relevant technical department to determine the removal method. Waste treatment method: After the waste is mixed with sand, spray it with butanol, and then spray with water. After neutralization, it will be diluted with water and discharged into the sewer.

Protective measures

Respiratory system protection: When you may be exposed to poisons, you should wear a hood-type electric air filter dust respirator. When necessary, self-contained breathing apparatus is recommended.

Eye protection: protection has been used in respiratory protection.

Body protection: wear polyethylene anti-virus suit.

Hand protection: Wear rubber gloves.

Other: Smoking is strictly prohibited at the work site. After work, take a shower and change clothes. Maintain good hygiene.

first-aid

Skin contact: Take off contaminated clothing immediately, use .5%-3% sodium sulfate gastric lavage, catharsis. Seek medical attention.

Eye contact: Immediately lift the eyelids, rinse thoroughly with plenty of running water or saline for at least 15 minutes. Seek medical attention.

Inhalation: Leave the scene quickly to a place with fresh air. Keep the airway open. If breathing is difficult, give oxygen. If breathing stops, give artificial respiration immediately. Seek medical attention.

Ingestion: Rinse mouth with water and drink milk or egg white by mistake. Can take sodium chloride. Seek medical attention.

Extinguishing methods: Do not use water, foam, carbon dioxide, halogenated hydrocarbons (such as 1211 fire extinguishing agent) to extinguish fires. Only use a metal cover or dry graphite or dry dolomite powder to extinguish the fire.