Process for the production of a gasoline with a low sulfur content

Patent metadata

Field	Value
Publication number	US-9745524-B2
Application number	US-201314439458-A
Country	US
Kind code	B2
Filing date	Sep 26, 2013
Priority date	Oct 29, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

This invention relates to a process for treatment of a gasoline that comprises diolefins, olefins and sulfur-containing compounds including mercaptans, consisting of a stage for treatment of the gasoline in a distillation column ( 2 ) comprising at least one reaction zone ( 3 ) including at least one catalyst that makes it possible to carry out the addition of mercaptans to the olefins that are contained in the gasoline that distills toward the top of the catalytic column.

First claim

The invention claimed is:

1. A process for treating a gasoline comprising diolefins, olefins, and sulfur-containing compounds including mercaptans, consisting of a stage for treating gasoline in the presence of hydrogen in a distillation column ( 2 ) comprising at least one reaction zone ( 3 ) including at least one catalyst, with the catalyst being in sulfide form and comprising a substrate that consists of gamma-alumina or delta-alumina with a specific surface area of between 70 m 2 /g and 350 m 2 /g, a content by weight of oxide of the element of group VIb of between 1 and 30% by weight relative to the total weight of the catalyst, a content by weight of oxide of the element of group VIII of between 1 and 30% by weight relative to the total weight of the catalyst, a sulfurization rate of the metals that constitute said catalyst that is at least equal to 60%, a molar ratio between the metal of group VIII and the metal of group VIb of between 0.6 and 3 mol/mol, in which:
gasoline is injected into the distillation column at a level located below the reaction zone ( 3 ) in such a way as to separate a desulfurized light gasoline at a point located above the reaction zone and a heavy gasoline comprising the majority of the sulfur-containing compounds at the bottom of the column, and
concurrently the gasoline that distills at the top of the catalytic column is brought into contact with the catalyst of the reaction zone ( 3 ) and the hydrogen in such a way as to provide desulfurized light gasoline, and

in which the distillation column is configured for operating as a depentanizer in such a way as to provide a light gasoline that has at most 5 carbon atoms or
in which the distillation column is configured for operating as a dehexanizer in such a way as to provide a light gasoline that has at most 6 carbon atoms.

2. The process according to claim 1 , in which the element of group VIII is nickel or cobalt.

3. The process according to claim 1 , in which the element of group VIb is molybdenum or tungsten.

4. The process according to claim 1 , in which the element of group VIII is nickel and the element of group VIb is molybdenum.

5. The process according to claim 4 , in which the content of nickel oxide is between 4% and 12% by weight, and the content of molybdenum oxide is between 6% and 18% by weight relative to the total weight of catalyst.

6. The process according to claim 1 , in which the column also comprises a catalytic bed arranged below or above the reaction zone ( 3 ) and comprises a catalyst for isomerization of the olefins, with said isomerization catalyst comprising at least one metal of group VIII deposited on a porous substrate.

7. The process according to claim 1 , in which the metal of group VIII is palladium, and the palladium content expressed in % by weight of palladium metal relative to the weight of the isomerization catalyst is between 0.1 and 2%.

8. The process according to claim 7 , in which the porous substrate of the isomerization catalyst is alumina, nickel aluminate, silica, silicon carbide, or a mixture thereof, and the metal of group VIII is nickel or palladium.

9. The process according to claim 1 , in which the distillation column is configured for operating as a depentanizer in such a way as to provide a light gasoline that has at most 5 carbon atoms.

10. The process according to claim 1 , in which the distillation column is configured for operating as a dehexanizer in such a way as to provide a light gasoline that has at most 6 carbon atoms.

11. The process according to claim 1 , in which the gasoline that is to be treated is directly obtained from a unit for catalytic cracking, coking, visbreaking or steam-cracking.

Assignees

• Ifp Energies Now

Inventors

• Touzalin Olivier
• Leflaive Philibert
• Asteris Diamantis
• Largeteau Delphine
• Nocca Jean Luc

Classifications

• C10G29/205 Primary

  by reaction with hydrocarbons added to the hydrocarbon oil · CPC title

• C10G2300/4087

  Catalytic distillation · CPC title

• C10G45/08

  in combination with chromium, molybdenum, or tungsten metals, or compounds thereof · CPC title

• C10G45/36

  containing nickel or cobalt metal, or compounds thereof · CPC title

• C10G45/38 Primary

  in combination with chromium, molybdenum or tungsten metals, or compounds thereof · CPC title