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Cetane improvers
The cetane number and cetane index of diesel are influenced by the quality of crude petroleum. A high cetane number/index is currently more difficult to produce due to the increasing supply of heavier crude petroleum.
To increase diesel’s cetane number/index, refiners have several choices, including:
    •Selective blending, i.e. blending of hydrotreated straight-run and secondary middle distillates
    •Changing or upgrading the crude processing which may involve significant changes to product yield
    •Adding cetane improvers
Naturally, the most economical way to improve the cetane number/index is by adding cetane improvers.
Most diesel specifications do not set any limits on the cetane improvers that refiners can add. Hence, the choice is left to the refiners and oil marketing companies
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Cetane improvers