Identification

Chinese name:Acetic anhydride

Dangerous goods number：81602

English name：Acetic anhydride

UN number：1715

Molecular formula：C4H6O3

Molecular weight：102.09

CAS number：108-24-7

Physical and chemical properties

Appearance and traits

A colorless, transparent liquid with a pungent odor and a vapour-like gas.

Melting point (°C)

-73.1

Relative density (water = 1)

1.08

Relative density (air = 1)

3.52

Boiling point (°C)

138.6

Saturated vapor pressure (kPa)

1.33/36℃

Solubility

Soluble in benzene, ethanol, ether.

Toxicity and health hazards

Route of invasion

Inhalation, ingestion, percutaneous absorption.

toxicity

LD50：1780mg/kg(Rat oral)，4000mg/kg(Transdermal)； LC50：4170 mg/m3，4小时(Rat inhalation)

Health hazard

It has a stimulating effect after inhalation, causing cough, chest pain and difficulty breathing. Direct contact with the eye can cause burns; vapor is irritating to the eye. Skin contact can cause burns. Oral burning of the mouth and digestive tract, abdominal pain, nausea, vomiting and shock. Chronic effects: Workers who are chronically affected by the vapor of this product may have rheumatoid conjunctivitis, photophobia, and upper respiratory tract irritation.

First aid method

Skin contact: Remove contaminated clothing and rinse immediately with running water. Eye contact: Immediately lift eyelids, rinse with running water or saline; seek medical attention. Inhalation: Remove from the scene to fresh air, keep the airway open; if necessary, perform artificial respiration; seek medical attention. Ingestion: Rinse mouth with water and drink milk or egg white. Seek medical attention.

Burning explosion hazard

Flammability

Flammable

Combustion decomposition product

CO、CO2

Flash point (°C)

49

Upper explosion limit (v%)

10.3

Ignition temperature (°C)

316

Lower explosion limit (v%)

2.0

Dangerous characteristics

Its vapor forms an explosive mixture with air, causing combustion and explosion in case of open flame and high heat. Reacts with strong oxidants.

Burning explosion hazard性

Flammability

Flammable

Combustion decomposition product

CO、CO2

Flash point (°C)

49

Upper explosion limit (v%)

10.3

Ignition temperature (°C)

316

Lower explosion limit (v%)

2.0

Dangerous characteristics

Its vapor forms an explosive mixture with air, causing combustion and explosion in case of open flame and high heat. Reacts with strong oxidants.

Storage and transportation conditions

Storage and transportation conditions: Store in a cool, dry, ventilated place. Keep away from fire and heat. Protect from direct sunlight. Keep the container sealed and store it separately from oxidants, acids and alkalis. Pay attention to personal protection for dispensing and handling operations. Lightly load and unload during handling to prevent damage to packaging and containers. Transportation is carried out according to the prescribed route and it is not suitable for transportation on rainy days. Leakage treatment: evacuate personnel from the contaminated area to a safe area, prohibit unrelated personnel from entering the contaminated area and cut off the fire source. It is recommended that emergency personnel wear self-contained positive pressure breathing apparatus and wear acid and alkali protective overalls. Properly ventilate, do not directly touch the spill, and block the leak while ensuring safety. Spray mist can slow down (or spread), but do not spray water directly on leaks or leaks. Absorbed with activated carbon or other inert materials, then collected and transported to a waste disposal site for disposal. If there is a large amount of leakage, it should be stored in the dike, preferably without water treatment, and then collected, transferred, recycled or discarded after harmless treatment.

And leak handling

Extinguish with anti-solvent foam, dry powder, carbon dioxide, and misty water.