Process for naphtha reforming
AssigneeExxon Mobil Chemical Patents Inc.
InventorsJohn Francis Walsh, Anthony Go, Duane Robert McGregor, John William Rebeck, Leonel Eduardo Sanchez
Life of this patent
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Abstract
A process comprises separating a naphtha feed into a fraction comprising C7− hydrocarbons and a heavy C8+ fraction, separating the C8+ fraction into a light fraction comprising C8 and/or C8-C9 which then is reformed to produce gasoline and/or a desired distribution of aromatics.
Claims32
A reforming process comprising:
- separating a hydrocarbon feed under first conditions effective to produce a first fraction comprising C7− hydrocarbons and a second fraction comprising C8+ hydrocarbons;
- separating said second fraction in a separator under second conditions effective to produce a light fraction comprising C8 hydrocarbons and a heavy fraction comprising essentially all C10+ hydrocarbons and essentially all C9 aromatic hydrocarbons;
- and
- reforming said light fraction in a reformer under third conditions effective to produce a reforming product.
A reforming process comprising:
- separating a naphtha feed under first conditions effective to produce a first fraction comprising C6 and C7 hydrocarbons in the range of from about 20 wt % to about 80 wt % and a second fraction comprising C8+ hydrocarbons;
- separating said second fraction in a separator under second conditions effective to produce a light fraction comprising C8 hydrocarbons in the range of from about 20 wt % to about 98 wt % and a heavy fraction comprising essentially all C10+ hydrocarbons and essentially all C9 aromatic hydrocarbons;
- and
- reforming said light fraction in a reformer under third conditions effective to produce a reforming product comprising benzene, toluene, xylenes, ethylbenzene, and heavy aromatics.
A reforming process comprising:
- separating a hydrocarbon feed under first conditions effective to produce a first fraction comprising C7− hydrocarbons and a second fraction comprising C8+ hydrocarbons;
- separating said second fraction in a first separator under second conditions effective to produce a light fraction comprising C8 hydrocarbons and a heavy fraction comprising essentially all C10+ hydrocarbons and essentially all C9 aromatic hydrocarbons;
- reforming said light fraction in a first reformer under third conditions effective to produce a first reforming product;
- separating said first fraction in a second separator under fourth conditions effective to produce a third fraction comprising C6 and C7 hydrocarbons;
- and
- reforming said heavy fraction and said third fraction in a second reformer under fifth conditions effective to produce a second reforming product.
A process for reforming paraffinic and naphthenic hydrocarbons of a feedstock containing C5 through at least C11 hydrocarbons into aromatic hydrocarbon structures, said process having a flexibility for separating said feedstock into a desirable fraction for reforming to, as desired, enhance yield of C6-C8 aromatic hydrocarbons or yield of C7-C8 aromatic hydrocarbons or yield of xylene hydrocarbons, comprising the steps of:
- (a) topping said feedstock to separate therefrom (1) as a first fraction substantially all C5 and lower weight hydrocarbons, said first fraction containing from about 0 wt % to about 95 wt % of C6-C7 hydrocarbons and of the C8 hydrocarbon content of said feed, containing 15% or less of said C8 hydrocarbons, and (2) as a second fraction one comprising C8+ hydrocarbons;
- (b) when maximum production of benzene-toluene-xylenes (BTX) is desired, then (1) feeding said second fraction over a reforming catalyst under conditions effective for reforming its C6-C9 hydrocarbons to BTX;
- when maximum production of xylenes is desired, then (2) treating said second fraction to tail out of it as a third fraction essentially all C10+ hydrocarbons and essentially all C9 aromatic hydrocarbon and thereafter reforming said treated second fraction under conditions effective to reform its C8-C9 hydrocarbons into xylenes.
Dependencies are inferred from the claim text.