Processes and systems for petrochemical production integrating deep hydrogenation of middle distillates from gas oil hydroprocessing
AssigneeSaudi Arabian Oil Company
InventorOmer Refa Koseoglu
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Abstract
Process scheme configurations are disclosed that enable deep hydrogenation of middle distillates. The hydrogenated middle distillates are processed in a steam cracker for conversion into light olefins. Feeds to the deep hydrogenation zone include diesel range streams from a diesel hydrotreating zone, a gas oil hydroprocessing zone, and/or a vacuum residue hydrocracking zone. The deep hydrogenation zone operates under conditions effective to reduce aromatic content in a diesel range feedstream from a range of about 10-40 wt % or greater, to a hydrogenated distillate range intermediate product having an aromatic content of less than about 5-0.5 wt %.
Claims15
A process for petrochemical production comprising:
- subjecting crude oil to atmospheric distillation to separate at least atmospheric residue;
- subjecting all or a portion of the atmospheric residue to vacuum distillation to produce at least vacuum gas oil;
- subjecting the vacuum gas oil to hydroprocessing to produce at least middle distillates;
- optionally hydrotreating all or a portion of the middle distillates produced in hydroprocessing;
- subjecting all or a portion of middle distillates or hydrotreated middle distillates to hydrogenation to hydrogenate aromatics contained in the middle distillates and produce hydrogenated middle distillates, wherein hydrogenation occurs in the presence of an effective quantity of a hydrogenation catalyst containing one or more active metal components selected from Pt, Pd, Re and a combination comprising at least two of Pt, Pd or Re, and the hydrogenation catalyst including a catalyst support comprising non-acidic amorphous alumina and about 0.1-15 wt % of a modified USY zeolite having one or more of Ti, Zr and/or Hf substituting aluminum atoms constituting the zeolite framework thereof;
- and
- subjecting all or a portion of the hydrogenated middle distillates to thermal cracking in a steam cracking complex to obtain light olefins.
A system for petrochemical production comprising:
- an atmospheric distillation unit operable to separate at least atmospheric residue from a crude oil feedstock;
- a vacuum distillation unit operable to separate at least vacuum gas oil from all or a portion of the atmospheric residue;
- a gas oil hydroprocessing zone operable to produce at least middle distillates from all or a portion of the vacuum gas oil;
- a fixed-bed hydrogenation zone operable to produce hydrogenated middle distillates from all or a portion of the middle distillates produced in the gas oil hydroprocessing zone, the hydrogenation zone containing an effective quantity of a hydrogenation catalyst, the hydrogenation catalyst
- containing one or more active metal components selected from Pt, Pd, Re and a combination comprising at least two of Pt, Pd or Re, and
- including a catalyst support comprising non-acidic amorphous alumina and about 0.1-15 wt % of a modified USY zeolite having one or more of Ti, Zr and/or Hf substituting aluminum atoms constituting the zeolite framework thereof;
- and
- a steam cracking complex operable to thermally crack all or a portion of the hydrogenated middle distillates for production of light olefins.
Dependencies are inferred from the claim text.