Benzene CAS 71-43-2

The chemical formula of benzene is C6H6, formerly known as the granary granary, 焑, 㷍, 菕, wheel substance, etc. It is flammable, volatile, punchy and colorless liquid at room temperature. Benzene is highly toxic. Benzene is the simplest aromatic hydrocarbon, insoluble in water, easily soluble in organic solvents, itself can also be used as an organic solvent. Benzene is the basic raw material of petrochemical industry, and its output and production technology level is the symbol of the development level of national petrochemical industry. The benzene ring system is called the benzene ring, which is the simplest aromatic ring. The structure of benzene molecule after removing a grain of hydrogen is called phenyl group, which is expressed by Ph; Thus benzene can also be expressed as PhH.

Alias: Pure benzene

Molecular formula: C6H6

CAS:71-43-2

UN:1114

Appearance: Colorless, transparent, highly flammable, volatile liquid with a gasoline-like odor

Density :0.88 g/cm³

Boiling point :80 °C

Melting point :6 °C

Flash point :-11 °C

Application field

As early as 1920, benzene has been a common solvent in industry, mainly for metal degreasing. Benzene is toxic, and the human body can directly contact the solvent production process has not used benzene as a solvent.

Benzene can be used as a gasoline additive because it has the effect of reducing knock. Before the introduction of tetraethyl lead in 1950, all antiknock agents were benzene. But now that the leaded gasoline has faded, benzene has returned. Benzene has an adverse effect on the human body, the underground water quality is also polluted, European and American countries limit the content of benzene in gasoline shall not exceed 1%. In 2011, the U.S. Environmental Protection Agency tightened restrictions again, lowering the benzene limit in gasoline to 0.62 percent.

The most important use of benzene in the industry is to do chemical raw materials, the main uses are as follows:

1. Used as an important raw material for synthetic dyes, synthetic rubber, synthetic resins, synthetic fibers, synthetic grains, plastics, medicine, pesticides, photographic film and petrochemical products. This product has good solubility, so it is widely used as adhesives and industrial solvents such as: varnish, nitro fiber paint thinner, paint remover, lubricating oil, grease, wax, celluloid, resin, artificial leather and other solvents.

2. Standard sample for measuring refractive index. It can be used as a solvent and cleaning agent for precision optical instruments, electronics industry, organic synthesis, etc.

3. Used as an analytical reagent. If used as solvent, chromatographic analysis of standard substances.

4. Cosmetic solvents. It is mainly used as a thinner for cosmetics such as nail polish to accelerate drying and hardening, and to improve the solubility of skin film components such as resins.

5. Used as a solvent and synthetic benzene derivatives, spices, dyes, plastics, medicine, explosives, rubber, etc.

Storage precautions

Store in a cool, ventilated warehouse. Keep away from fire and heat. The temperature of the reservoir should not exceed 30 ℃. Keep the container sealed. It should be stored separately from oxidants and edible chemicals, and should not be mixed. Explosion-proof lighting and ventilation facilities are adopted. Do not use mechanical equipment and tools that are prone to spark. The storage area should be equipped with leak emergency treatment equipment and suitable containment materials.

Operation precautions

Closed operation to enhance ventilation. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that operators wear a self-priming filter gas mask (half mask), chemical safety protective glasses, protective work clothes, and rubber oil-resistant gloves. Keep away from fire and heat. No smoking in the workplace. Use explosion-proof ventilation systems and equipment. Prevents steam from leaking into the workplace air. Avoid contact with oxidants. When filling, the flow rate should be controlled, and there is a grounding device to prevent static accumulation. When handling, light loading and unloading should be done to prevent damage to packaging and containers. Equipped with the corresponding variety and quantity of fire equipment and leakage emergency treatment equipment. Empty containers may have harmful residues.