Process for the desulfurization of gasolines comprising a desulfurization by adsorption of the light fraction and a hydrodesulfurization of the heavy fraction
AssigneeInstitut Francais du Petrole
InventorsAlexandre Nicolaos, Florent Picard
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Abstract
The invention relates to a process for the desulfurization of gasolines comprising a stage for fractionation of said gasoline into a light fraction that comprises thiophenic compounds such as thiophene or methylthiophenes, and a heavy fraction that concentrates the heaviest aromatic sulfur-containing compounds. The heavy fraction is treated by hydrodesulfurization, while the light fraction is brought into contact with a solid adsorbent that makes it possible to eliminate at least partially said light thiophenic compounds, whereby said adsorbent solid is regenerated by a flow internal to the process.
Claims22
A process for the production of a desulfurized gasoline with a high octane number from a starting gasoline that comprises olefins and thiophenic compounds, said process comprising:
- a) distilling the starting gasoline into at least two fractions including:
- a light fraction containing a majority of olefins with 5 and 6 carbon atoms, as well as thiophene, having a final boiling point of 90 to 160° C.,
- a heavy fraction that no longer contains olefins with 5 carbon atoms and concentrates heavy sulfur-containing compounds, having a final boiling point up to 300° C.,
- b) desulfurizing said light fraction by adsorption of the sulfur-containing compounds on an adsorbent solid, whereby the adsorbent solid that is used is silicas, aluminas, zeolites, active carbons, resins, clays, metal oxides or reduced metals,
- c) hydrodesulfurizing of said heavy fraction on a catalyst that contains at least one metal of group VIII and a metal of group VIb, under standard hydrodesulfurization conditions,
- and regenerating the adsorbent solid at a temperature of greater than 50° C., while remaining in liquid phase with a desorption solvent that is a portion of the effluent of the hydrodesulfurization stage of the heavy fraction, recycling to hydrodesulfurization in (c) regeneration effluent containing sulfur-containing molecules initially retained on the adsorbent solid and mixing an additional portion of the effluent of said hydrodesulfurization stage with the effluent of the desulfurization (b) to constitute the desulfurized gasoline with a high octane number.
A process for the production of a desulfurized gasoline with a high octane number from a starting gasoline that comprises olefins and thiophenic compounds, said process comprising:
- a) distilling the starting gasoline into at least two fractions including:
- a light fraction containing a majority of olefins with 5 and 6 carbon atoms, as well as thiophene, having a final boiling point of 90 to 160° C.,
- a heavy fraction that no longer contains olefins with 5 carbon atoms and concentrates heavy sulfur-containing compounds, having a final boiling point of 300° C.,
- d) desulfurizing said light fraction by adsorption of the sulfur-containing compounds on an adsorbent solid, whereby the adsorbent solid that is used is silicas, aluminas, zeolites, active carbons, resins, clays, metal oxides or reduced metals,
- e) hydrodesulfurizing of said heavy fraction on a catalyst that contains at least one metal of group VIII and a metal of group VIb, under standard hydrodesulfurization conditions,
- and regenerating the adsorbent solid at a temperature of greater than 50° C., while remaining in liquid phase with a desorption solvent that is a portion of the effluent of the hydrodesulfurization stage of the heavy fraction, recycling to hydrodesulfurization in (c) regeneration effluent containing sulfur-containing molecules initially retained on the adsorbent solid and mixing an additional portion of the effluent of said hydrodesulfurization stage with the effluent of the desulfurization (b) to constitute the desulfurized gasoline with a high octane number.
Dependencies are inferred from the claim text.