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Saturated C₉ aromatics (A₉) are single-ring aromatic hydrocarbons and benzene ring isomers with the molecular formula C₉H₁₂ and an element composition of: carbon = 89.92%, hydrogen = 10.08%.

The 8 C₉ aromatic structural isomers are as follows:

1. Propylbenzene (n-propylbenzene)
2. Isopropylbenzene (cumene)
3. o-Ethyltoluene (2-ethyltoluene)
4. m-Ethyltoluene (3-ethyltoluene)
5. p-Ethyltoluene (4-ethyltoluene)
6. 1,2,3-Trimethylbenzene (hemimellitene)
7. 1,2,4-Trimethylbenzene (pseudocumene)
8. 1,3,5-Trimethylbenzene (mesitylene)

In the context of the refinery, C₉ aromatics are constituant of aromatic light naphtha, which primary components include:

• Trimethylbenzenes (TMB): 1,2,4-trimethylbenzene (20-45%) and 1,3,5-trimethylbenzene (8-15%)
• Mixed ethyltoluenes (ET): 25-35% of the mixture

References

1. Dr. Phil Brown > Advanced Chemistry: Part 14.7 > Structural isomers of molecular formula C₉H₁₂.
2. OECD - Existing Chemicals Database > April 2012, SIDS INITIAL ASSESSMENT PROFILE > C₉ Aromatic Hydrocarbon Solvents Category.

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