October 2008

Process Developments

Improve calculating cetane numbers

An empirical formula simplifies estimating cetane values for different diesel fuel specifications

Dhar, A. K., Indian Oil Corp. Ltd.

In 1999, the diesel hydrodesulfurization (DHDS) unit at the Indian Oil Mathur refinery was commissioned so that the refinery could meet the fuel specifications for Euro 2 diesel. In the DHDS unit, the cetane number of diesel product did not increase due to low reaction pressure (40kg/cm2) in which aromatic hydrocarbon saturation is minimum. The aromatic hydrocarbon content has a lower value than the cetane number. Later in May 2005, a diesel hydrotreating (DHDT) unit was brought online so that the refinery could process diesel fuel to meet Euro 3 and Euro 4 diesel specifications. 'Clean fuel' operations. With the recommendation of Task Force of Government of India's Auto Fuel Policy,

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