Question

1. Explain key differences between olefins, paraffins and aromatics. Explain the types of aromatics.

2. Given the current price of benzene and toluene, would you have hydrodealkylation as part of your petrochemical complex facility ? What feedstock would you prefer to provide for option to operate the hydrodealkylation facility ? Would you operate that facility if you have the option today ?

3. If you are expecting a production of about 200 Tonnes/Year o-xylene facility, what should be the amount of reformate feedstock required ?

Answer 1

Solution :

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Answer 1

Aromatic hydrocarbons are also cyclic but are derivatives of benzene. The rings are characterized by alternating double bonds and, in contrast to olefins, are quite stable, though not as stable as paraffins. Oils containing primarily paraffin hydrocarbons are called paraffin-based or paraffinic. , compound made up of hydrogen and carbon Olefin, also called alkene, contains one or more pairs of carbon atoms linked by a double bond. Olefins are examples of unsaturated hydrocarbons (compounds that contain only hydrogen and carbon and at least one double or triple bond).

Answer 2

Types of aromatics :

Neutral homocyclics

Benzene, as well as most other annulenes (with the exception of cyclodecapentaene, because it is non-planar) with the formula C4n+2H4n+2 where n is a natural number, such as cyclotetradecaheptaene (n=3).

Heterocyclics

In heterocyclic aromatics (heteroaromatics), one or more of the atoms in the aromatic ring is of an element other than carbon.

Fused aromatics and polycyclics

Polycyclic aromatic hydrocarbons are molecules containing two or more simple aromatic rings fused together by sharing two neighboring carbon atoms (see also simple aromatic rings). Examples are naphthalene, anthracene, and phenanthrene. In fused aromatics, not all carbon–carbon bonds are necessarily equivalent, as the electrons are not delocalized over the entire molecule.

Substituted aromatics

Many chemical compounds are aromatic rings with other functional groups attached. Examples include trinitrotoluene (TNT), acetylsalicylic acid (aspirin), paracetamol, and the nucleotides of DNA.

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