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    Benzene

    Benzene in Tradeasia

    IUPAC Name

    Benzene

    Cas Number

    71-43-2

    HS Code

    2902.20.00

    Formula

    C6H6

    Basic Info

    Appearance

    Clear, Colorless Liquid

    Common Names

    Benzol

    Packaging

    100 g packages, 500 g packages, 1 kg packages, 25 kg drums, 200 L drums

    Overview

    Benzene is one of the important chemical compounds in the world, with the chemical formula C6H6. It is one of the natural constituents of crude oil and belongs to one of the elementary petrochemicals. As benzene has a cyclic ring which consists of continuous pi bond between the carbon atoms, it is categorised as an aromatic hydrocarbon. Benzene appears as clear, colourless liquid with a sweet smell. It is highly flammable and is used mainly as a precursor for the synthesis of more complex chemical molecules. However, due to its carcinogenic properties, its non-industrial applications are limited.

     

    Manufacturing process

    There are four main chemical processes which contributed to the industrial benzene production: (1) catalytic reforming, (2) toluene hydrodealkylation, (3) toluene disproportionation, and (4) steam cracking. The ATSDR Toxicological Profile for benzene has observed that the catalytic reforming contributed to 44-50% of the total U.S benzene production.

     

    (1) Catalytic Reforming

    This process involves adding hydrogen gas to a mixture of hydrocarbons (with boiling points 60–200 °C), with the aid of rhenium chloride catalyst at high temperature and pressure.

     

    (2) Toluene hydrodealkylation

    Toluene hydrodealkylation synthesise benzene by converting toluene to benzene. This involves the mixing of toluene with hydrogen, which is then passed over a chromium, molybdenum or platinum oxide catalyst at elevated temperature and pressure.

     

    (3) Toluene disproportionation

    Toluene disproportionation (TDP) serves as an alternative to toluene hydrodelakylation, when a chemical complex has similar demands for both benzene and xylene. Two toluene molecules are reacted and the methyl groups will rearrange from one toluene molecule to the other, giving one benzene molecule and one xylene molecule.

     

    (4) Steam cracking

    This process involves the production of ethylene and other alkenes from aliphatic hydrocarbons. Steam cracking can produce a benzene-rich liquid by-product known as pyrolysis gasoline. This liquid can be mixed with other hydrocarbons to yield aromatic hydrocarbons such as benzene.

    Petrochemical Industry

    Benzene is used as a component of gasoline to increase octane rating and reduces knocking. However, due to its negative health effects, the percentage of benzene found in gasoline has been decreasing through the years.

     

    Intermediate chemicals

    Benzene is mainly used as an intermediate to make other chemicals such as ethylbenzene, cumene, cyclohexane, nitrobenzene and alkylbenzene.

     

    Other applications

    It is also used to make chemicals in the manufacture of industrial products such as dyes, detergents, explosives, pesticides, synthetic rubber, plastics, and pharmaceuticals.

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