May 2006

Refining Developments

Resid hydrocracker produces low-sulfur diesel from difficult feeds

A European refiner applies new processing technology to convert highly refractory vacuum resid into quality distillates

Gragnani, A., Axens; Putek, S., PKN Orlen SA

In Europe, refining Ural crude oil is increasing due to availability and attractive pricing of this feedstock. Vacuum residue from this crude oil is high in hetero-atom (sulfur and nitrogen) content and refractory asphaltene species. Thus, it is a difficult feed to process via resid hydrocrackers. The PKN Orlen refinery is an older refinery that processes the Ural feed into transportation fuels. A need arose to have flexibility to process Ural feed while still meeting seasonal demands for low-sulfur fuel oil (<1 wt% sulfur) and increase distillate production. A new diesel hydrotreater was integrated with the existing resid hydrotreater to upgrade gasoil to ultra-low-sulfur diesel (ULSD)

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