Storage conditions and stability of benzene raw materials

2022-01-20

Storage conditions:

Storage precautions: Store in a cool and ventilated warehouse. Stay away from sources of fire and heat. The storage temperature should not exceed 37 ℃. Keep the container sealed. It should be stored separately from oxidants and edible chemicals, and avoid mixing storage. Adopt explosion-proof lighting and ventilation facilities. Prohibit the use of mechanical equipment and tools that are prone to generating sparks. The storage area should be equipped with emergency response equipment for leaks and suitable containment materials.


Stability:

1. Benzene is one of the most important basic organic raw materials and a representative of aromatic hydrocarbons. Has a relatively stable hexagonal ring structure.

The main chemical reactions include addition, substitution, and ring opening reactions. Under the action of concentrated sulfuric acid and nitric acid, substitution reactions are prone to occur to produce nitrobenzene. Reacts with concentrated sulfuric acid or fuming sulfuric acid to produce benzenesulfonic acid. Using metal halides such as ferric chloride as catalysts, halogenation reactions occur at lower temperatures to produce halogenated benzene. Using aluminum trichloride as a catalyst, alkylate with olefins and halogenated hydrocarbons to produce alkylbenzene; Acylation reaction occurs with acid anhydrides and acyl chlorides to generate acylbenzenes. In the presence of vanadium oxide catalyst, benzene is oxidized by oxygen or air to form maleic anhydride. Benzene undergoes cracking when heated to 700 ℃, producing carbon, hydrogen, and small amounts of methane and ethylene. Using platinum and nickel as catalysts, a hydrogenation reaction is carried out to generate cyclohexane. Using zinc chloride as a catalyst, benzyl chloride is generated through chloromethylation reaction with formaldehyde and hydrogen chloride. But the benzene ring is relatively stable and does not react with oxidants such as nitric acid, potassium permanganate, and dichromate.

3. It has high refractive index and strong aromatic aroma, is flammable and toxic. It is miscible with ethanol, ether, acetone, carbon tetrachloride, carbon disulfide, and acetic acid, and slightly soluble in water. Benzene, which is non corrosive to metals but of lower grade, contains sulfur-containing impurities that have a significant corrosive effect on copper and certain metals. Liquid benzene has a degreasing effect and can be absorbed by the skin and cause poisoning, so it should be avoided from contact with the skin.

4. Steam and air form an explosive mixture with an explosive limit of 1.5% -8.0% by volume.

5. Stability: Stable

6. Prohibited substances include strong oxidants, acids, halogens, etc

7. Aggregation hazard: non aggregation



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