Chinese name：Styrene

Dengerous goods number：33541

English name：phenylethylene；styrene

UN number：2055

Molecular formula：C₈H₈

Molecular weight：104.14

CAS号：100-42-5

Physical and chemical properties

Appearance and traits

Colorless transparent oily liquid.

Melting point (°C)

-30.6

Relative density (water = 1)

0.91

Relative density (air=1|）

3.6

Boiling point (°C)

146

Saturated vapor pressure (kPa)

1.33/30.8℃

Solubility

Do not dissolve in water, soluble in most organic solvents such as alcohol and ether.

Toxicity and health hazards

Route of invasion

Inhalation, ingestion, percutaneous absorption.

toxicity

LD₅₀：5000mg/kg(Rat oral)；

LC₅₀：24000 mg/m³，4hours(Rat inhalation)

Health hazard

Irritating and anesthetic effects on the eyes and upper respiratory tract. Acute poisoning: high concentration immediately causes irritation of the eye and upper respiratory tract mucosa, eye pain, tearing, salivation, sneezing, sore throat, cough, etc., followed by headache, dizziness, nausea, vomiting, general malaise, etc.; severe punishment Can have dizziness, gait. When the eye is contaminated with styrene liquid, it can cause burns. Chronic effects: common neurasthenia syndrome, headache, fatigue, nausea, loss of appetite, bloating, depression, forgetfulness, finger tremors, etc. It has a stimulating effect on the respiratory tract, and long-term exposure sometimes causes obstructive pulmonary disease. Rough skin, chapped and thickened

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: Drink plenty of warm water, induce vomiting, and seek medical attention.

Burning explosion hazard

Flammability

Flammable

Combustion decomposition products

Carbon monoxide, carbon dioxide.

Flash point (°C)

34.4

Upper explosion limit (v%)

6.1

Ignition temperature (°C)

490

Lower explosion limit (v%)

1.1

Construction fire risk classification

乙

Stability

Stability

polymerization hazard

polymerization

Incompatibility

Strong oxidants, acids.。

Dangerous characteristics

Its vapor and air can form an explosive mixture. In case of fire, high heat or contact with oxidants, there is a danger of fire and explosion. In the case of acidic catalysts such as Lewis catalysts, Ziegler catalysts, sulfuric acid, ferric chloride, aluminum chloride, etc., violent polymerization can be produced, and a large amount of heat is released. Its vapor is heavier than air and can spread to a relatively distant place at a lower place.

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 and acids. Pay attention to personal protection for dispensing and handling operations. Lightly load and unload when transporting. The tank (tank) used in transportation should have a grounding chain, and a hole partition can be arranged in the tank to reduce the static electricity generated by the shock. Leakage treatment: Rapid evacuation of personnel from the contaminated area to the safe area, isolation and strict restrictions on access. Cut off the fire source. Wear masks, gloves to collect leaks, and use sand or other inert materials to absorb the residue and transfer to a safe place. The contaminated water body is cut off, and the diffusion of styrene sprinkled on the water surface is restricted by a fence or the like. The poisoned person is transferred to a fresh and safe area of the air, removes the contaminated coat, rinses the contaminated skin, rinses the eyes with plenty of water, rinses the whole body, and rinses the mouth. Drink plenty of water, can not induce vomiting, that is, to the hospital. Strengthen on-site ventilation to accelerate the volatilization of residual styrene and drive away vapors.

And leak handling

Move the container from the fire to the open space as much as possible. Spray water to keep the fire container cool until the end of the fire. Extinguishing media: foam, dry powder, carbon dioxide, sand. Fire extinguishing with water is not effective. In case of fire, firefighters must operate in a protective shelter