Common knowledge of "Benzene" Emergency Rescue for Dangerous Chemicals

Special warning

★ Confirm human carcinogens;

★ flammable, its steam and air mix, can form explosive mixtures;

★Attention: The flash point is very low, and water extinguishment is not effective;

★ Do not throw DC water to save.

  Chemical formula: Molecular formula   C6H6

  Hazard - risk categories: Flash point flammable liquids in category 3.2

  Combustion explosion risk

Flammable, steam can form an explosive mixture with air, and can cause combustion explosion when exposed to fire or high heat energy;

Steam is heavier than air, and it can spread to relatively far places in the lower part of the fire. When it encounters fire, it will catch fire and return.

In case of high heat, the internal pressure of the container increases and there is a risk of cracking or explosion.

  Health hazards

Occupational exposure limits: PC-TWA 6 mg / m3 ( skin ) (G1) ; PC-STEL 10 mg / m3 ( skin ) (G1)

IDLH : 500ppm

Acute toxicity: Rat oral LD501800mg/kg ; Rabbit percutaneous LD508272mg/kg ; Rat inhalation LC5031900mg/m3 (7h)

Inhalation of high concentrations of benzene vapor has an anesthetic effect on the central nervous system, resulting in headache, dizziness, nausea, vomiting, confusion, lethargy and so on. Serious loss of consciousness, convulsions, and even death.

Long-term exposure to benzene damages the hematopoietic system, causing leukopenia and thrombocytopenia, and severely leading to aplastic anaemia.

This product can cause leukemia. With reproductive toxicity.

 

environmental impact

At very low concentrations, it can cause damage to aquatic organisms, especially in the liver and muscles of fish, but once it is separated from polluted water, pollutants in the fish can be quickly released.

Has a strong volatility, easily causing air pollution;

In the soil has a strong mobility;

In the absence of oxygen, it is difficult to be biodegraded. Aerobic degradation half-life in state 6 - 20 days.

 

  Physical and chemical properties and uses

Physical and chemical properties

Colorless, transparent, non-polar liquid with a strong aroma. Slightly soluble in water. Reacts with oxidants such as nitric acid, concentrated sulfuric acid, and potassium permanganate.

Melting point: 5.5 °C

Boiling point: 80.1 °C

Relative density: O.88

Flash point: 11 °C

Explosion limit: 1.2 % to 8.0 %

use

It is mainly used for the manufacture of benzene derivatives. Is an important raw material for the production of synthetic resins, synthetic rubber, synthetic fibers, dyes, detergents, pharmaceuticals, pesticides and specialty solvents. Also used as a solvent and fuel admixture.

 

Personal protection

Wear a full-defense canister.

Wear closed chemical protective clothing.

 

Emergency operations

  Isolation and public safety

Leakage: If the scope of pollution is unknown, the initial isolation is at least 50m , and the downwind direction is evacuated at least 300m . Then the gas concentration is detected and the isolation and evacuation distance are adjusted according to the actual concentration of harmful vapors.

Fire: If there is a tank, tanker or tanker inside the fire, 80Om is isolated .

Consider evacuating people and supplies in the area of ​​separation

Evacuate irrelevant personnel and draw up warning areas;

Stay in the upper hand, do not enter the low-lying area;

Before entering a confined space, it must be ventilated.

 

Leakage treatment

Eliminate all sources of ignition ( no smoking near the leak zone, eliminate all open flames, sparks or fire    Flame );

Use explosion-proof communication tools;

In the case of ensuring safety, measures such as valve closing and plugging (emergency plugging tools) shall be adopted to cut off the leakage source;

Sprayed water dilutes volatile vapors;

All equipment should be grounded during operation;

Build dikes or trenches to contain spills to prevent entry into water bodies, sewers, basements, or restricted spaces;

Cover the spill with foam to reduce evaporation;

Absorb spillage with sand or other non-combustible materials;

If a leak occurs in the tank, the leaking liquid can be transferred through the tank.

 

Fire fighting

Note: The flash point is very low and water extinguishing is not effective;

Extinguishing agent: dry powder, carbon dioxide, foam;

Do not use direct current water to save;

Keep the container away from the fire as long as it is safe.

Tank, highway/railway tanker fire

Fire as far away as possible or use a remote control gun or water gun;

Cool the container with plenty of water until the fire is extinguished;

The container suddenly made an abnormal sound or abnormality occurred;

Do not stop at both ends of the tank.

 

first aid

Skin contact: Remove contaminated clothing and rinse thoroughly with water. Get medical attention.

Eye contact: Lift eyelids and rinse with running water or saline. Get medical attention.

Inhalation: quickly from the scene to fresh air. Keep the airway open. If breathing is difficult, give oxygen. Respiratory, cardiac arrest, and immediate CPR. Get medical attention. Disable adrenaline.

Ingestion: Drink water. Do not induce vomiting. Get medical attention.