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C9 Aromatics (Saturated)
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Aromatics
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C9 Aromatics
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Description

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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Benzene ring isomers of molecular formula C9H12 https://docbrown.info/page06/isomers/isom-c9h12.htm
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  UserPic Trimethylbenzene (Isomers) Trimethylbenzene added. 1/4/2025
  UserPic Ethyl Toluene (Isomers) Ethyltoluene added 1/4/2025
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