Mineral oils: processes and products – Refining – Sulfur removal
Reexamination Certificate
2007-04-03
2007-04-03
Caldarola, Glenn (Department: 1764)
Mineral oils: processes and products
Refining
Sulfur removal
C208S089000, C205S696000, C252S062000, C361S504000, C429S188000, C429S199000, C502S237000, C568S016000
Reexamination Certificate
active
10462809
ABSTRACT:
For desulfurization and, if necessary, for denitrification of hydrocarbon fractions the hydrocarbon mixture is brought into contact with a non-aqueous ionic liquid of general formula Q+A−, wherein Q+is a ammonium, phosphonium or sulfonium cation, that contains at least one alkylating agent of the formula RX−, making it possible to form ionic sulfur-containing derivatives (and, if necessary, nitrogen-containing derivatives) that have a preferred solubility in the ionic liquid; and the ionic liquid is separated from the hydrocarbon mixture that is low in sulfur and nitrogen by decanting.
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Boesmann, A. et al, Deep Desulfurization of diesel fuel by extraction with ionic liquids, Chem. Commun., 2001, 2494-2495.
Y. Shiraishi “A Novel Desulfurization Process for Fuel Oils Based On the Formation and Subsequent Precipitation of S-Alkylsulfonium Salts” Industrial & Engineering Chemistry Research, vol. 40, No. 22, 2001, pp. 4919-4924.
Diehl Fabrice
Magna Lionel
Olivier-Bourbigou Helene
Uzio Denis
Caldarola Glenn
Institut Francais du Pe'trole
Millen White Zelano & Branigan P.C.
Singh Prem C.
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