Lithium aluminum hydride, CAS 16853-85-3, lithium tetrahydroaluminum hydride, lithium aluminum hydride, (T-4)-lithium tetrahydroaluminate, lithium aluminum hydride

Product name :【 Lithium Aluminium Hydride】

1. Physical and chemical constants of substances:

CAS number 16853-85-3

Chinese name Lithium aluminum hydride

English name lithium aluminium tetrahydride; lithium aluminium hydride

Alias: lithium aluminum hydride, (T-4)-lithium tetrahydroaluminate, lithium aluminum hydride

Molecular formula: LiAlH4

Appearance: white loose crystal block or powder, which turns gray when placed

Molecular weight: 37.95 vapor pressure

Solubility: insoluble in hydrocarbons, soluble in ether

Density: relative density (water = 1) 0.92 stability stable

Danger mark 10 (flammable materials when wet)

Technical index:

Appearance: white or off-white crystalline powder;

Purity: ≥97%

Properties: stable in dry air, hydrolyze in moist air and cause combustion. It can be dissolved in organic solvents such as ether and tetrahydrofuran. Aldehydes, ketones, acids, acid anhydrides, esters, quinones, acid chlorides, etc. can be reduced to alcohols, nitriles can be reduced to primary amines, and halogenated hydrocarbons can be reduced to hydrocarbons. However, it is usually not possible to hydrogenate carbon-carbon double bonds.

Uses: Used as a reducing agent in medicine, perfume, pesticide, dye and other fine organic synthesis.

Physical and chemical constants

National standard number 43022

CAS number 16853-85-3

Chinese name Lithium aluminum hydride

English name lithium aluminium tetrahydride; lithium aluminium hydride

Alternative name lithium aluminum hydride

Molecular formula LiAlH4 Appearance and properties White loose crystal block or powder, which turns gray when placed

Molecular weight 37.95 Vapor pressure

Melting point Solubility Insoluble in hydrocarbons, soluble in ether, tetrahydrofuran, dimethyl cellosolve, slightly soluble in n-butyl ether, insoluble or very slightly soluble in hydrocarbons and dioxane.

Density Relative density (water = 1) 0.92 Stability Stable It can exist stably in dry air at room temperature. Susceptible to moisture. It reacts violently with water and alcohol.

Hazard Mark 10 (Inflammable materials when wet) Main purpose Used as a polymerization catalyst, reducing agent, jet engine fuel, and also used in synthetic drugs

the effect on the environment

Health hazard

Invasion route: inhalation, ingestion.

Health hazards: This product is strongly irritating to mucous membranes, upper respiratory tract, eyes and skin. After inhalation, it can cause death due to spasm, inflammation, edema, chemical pneumonia or pulmonary edema of the larynx and bronchi. Contact can cause burning, cough, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting.

Toxicological information and environmental behavior

Dangerous characteristics: When heated to 125 ℃, it will decompose lithium hydride and metal aluminum, and release hydrogen. It can ignite when ground in the air. When heated or in contact with moisture, water, alcohol, or acids, an exothermic reaction will occur and hydrogen will be released and burn or explode. It reacts violently and explodes on contact with strong oxidants.

Combustion (decomposition) products: alumina, water.

Emergency treatment methods

Leakage emergency treatment

Isolate the leaked contaminated area and restrict access. Cut off the fire source. It is recommended that emergency personnel wear self-contained positive pressure breathing apparatus and fire protective clothing. 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. Large amount of leakage: Cover with plastic sheet and canvas to reduce scattering. Contact the relevant technical department to determine the removal method.

Protective measures

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

Eye protection: protection has been used in respiratory protection.

Body protection: Wear chemical protective clothing.

Hand protection: Wear rubber gloves.

Other: Smoking is strictly prohibited at the work site. After work, take a shower and change clothes. Pay attention to personal hygiene.

first-aid

Skin contact: Take off contaminated clothing immediately and rinse with plenty of running water for at least 15 minutes. Seek medical attention.

Eye contact: Immediately lift the eyelids, and 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. Seek medical attention.

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

Chemical nature

has strong reducibility, can reduce aldehyde group, carbonyl group, lactone, peroxy group, pyridine salt, sulfoxide, halogenated hydrocarbon, amide, imide, carboxylic acid, etc.