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US 9,752,080 B2Granted
Process for producing hydrocarbons
AssigneeHaldor Topsoe A/S
InventorsThomas Sandahl Christensen, Ole Frej Alkilde
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for the production of liquid hydrocarbons by the use of light-end fractions from downstream synthesis in the reforming section of the plant.
Claims12
Process for the production of liquid hydrocarbons from a naphtha free hydrocarbon feedstock comprising:
- (a) passing a hydrocarbon feedstock through a hydrogenation stage to form a hydrogenated feedstock;
- (b) passing the naphtha free hydrogenated feedstock through a desulfurization stage to form a desulfurized feedstock;
- (c) passing the desulfurized feedstock through a pre-reforming catalytic nickel stage under the addition of steam to form a pre-reformed gas;
- (d) passing the pre-reformed gas through an autothermal reformer (ATR) or Catalytic Partial Oxidation unit (CPO) under the addition of an oxidant gas to form a synthesis gas;
- (e) passing the synthesis gas through a Fischer-Tropsch synthesis stage to form a tail gas stream and a raw product stream of hydrocarbons;
- (f) passing the raw product stream of hydrocarbons through an upgrading stage to form a final product stream of liquid hydrocarbons and a naphtha free light-end fraction stream, the naphtha free light-end fraction stream comprises a C1-C6 fraction and C6+ fraction containing paraffinic and olefinic hydrocarbons, but no naphtha, wherein said naphtha free light-end fraction stream is combined with a stream of natural gas to form the naphtha free hydrocarbon feedstock.
3 more elements
Process for the production of liquid hydrocarbons in the form of gasoline from a naphtha free hydrocarbon feedstock containing natural gas comprising:
- (i) combining a naphtha free light-end fraction stream with a stream of natural gas to form the naphtha free hydrocarbon feedstock;
- (ii) passing said naphtha free hydrocarbon feedstock through a hydrogenation stage to form a hydrogenated feedstock;
- (iii) passing the hydrogenated feedstock through a desulfurization stage to form a desulfurized feedstock;
- (iv) passing the desulfurized feedstock through a pre-reforming stage under the addition of steam to form a pre-reformed gas;
- (v) passing the pre-reformed gas through an autothermal reformer (ATR), secondary reformer or Catalytic Partial Oxidation unit (CPO) under the addition of an oxidant gas to form a synthesis gas;
- (vi) passing the synthesis gas through a methanol synthesis stage, dimethyl ether (DME) synthesis stage, or a combination of both, to form a raw product stream of oxygenates comprising methanol, DME or a mixture of both;
- (vii) passing the raw product stream of oxygenates through a gasoline reactor to form a raw product stream of gasoline and passing said raw product stream through an upgrading stage to form a final product stream of liquid hydrocarbons comprising gasoline and a naphtha free light-end fraction stream, in which the light-end fraction stream is liquefied petroleum gas (LPG) constituted by a C2-C6 fraction.
4 more elements
Dependencies are inferred from the claim text.