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Cetane improvers
The cetane number/index of diesel is 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 hydrotreated straight-run and secondary middle distillates
    •Changing or upgrading the crude processing, which may involve significant changes to product yield
    •Adding cetane improvers
The most economical way to improve the cetane number/index is by adding cetane improvers.
Most diesel specifications do not set limits for cetane improvers. The choice is left to refiners and oil marketing companies. The most used cetane improvers are based on 2-ethylhexyl nitrat
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Cetane improvers