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Overview

A new oxidative desulfurization process (UniPure), demonstrated in a pilot plant, for ultra low S diesel fuel is presented.Diesel fuel with up to 500 ppm S was heated up to 90-100° in an oxidizing reactor that contained H₂O₂, H₂O and organic acid catalysts.The alkylated dibenzothiophene compounds in the diesel fuel were oxidized very fast to the corresponding sulfones which were extractedThe oxidized diesel, that did not contain residual peroxides was contacted with NaOH to remove traces of acids, washed and dried.The resulting diesel fuel had an extremely low S level of about 2 ppm, and compared to hydrotreating processes with similar desulfurization performance, the presented technol. is relatively inexpensive.

Hydrocarbon Engineering

Developing desulfurisation

Author: Nero, Vincent P. ; Levy, Robert E. ; Lee, Fu-Ming ; Clark, Steven P. ; Rappas, Alkis S. ; Bowers, Keith

A process developed by the authors's affiliation for the oxidative desulfurization of diesel fuel and gasoline is presented.Compounds containing sulfur were oxidized with aqueous H₂O₂ in a continuously operating plant, and the resulting sulfones partitioned between the organic and aqueous phase, and in this way the S-compound could be separated from the diesel and gasoline.It was shown that it was possible to decrease the S content of gasoline and diesel down to <10 ppm.

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