Manufacturing a base stock

Patent metadata

Field	Value
Publication number	US-10858600-B2
Application number	US-201916541617-A
Country	US
Kind code	B2
Filing date	Aug 15, 2019
Priority date	Aug 22, 2018
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

Systems and a method for manufacturing a base stock from a light gas stream are provided. An example method includes oxidizing the light gas stream to form a raw ethylene stream. Water is removed from the raw ethylene stream, and carbon monoxide in the raw ethylene stream is oxidized. Carbon dioxide is separated from the raw ethylene stream, and the raw ethylene stream is oligomerized to form a raw oligomer stream. A light olefinic stream is distilled from the raw oligomer stream and a light alpha olefin is recovered from the light olefinic stream. A heavy olefinic stream is distilled from the raw oligomer stream. The heavy olefinic stream is hydro-processed to form a hydro-processed stream. the hydro-processed stream is distilled to form the base stock.

First claim

The invention claimed is:

1. A method for manufacturing a base stock from a light gas stream, comprising:
oxidizing the light gas stream to form an impure ethylene mixture;
removing water from the impure ethylene mixture to form a water-depleted impure ethylene mixture;
oxidizing carbon monoxide in the water-depleted impure ethylene mixture to form a CO-depleted impure ethylene mixture;
separating carbon dioxide from the CO-depleted impure ethylene mixture to form a CO 2 -depleted impure ethylene mixture;
oligomerizing the CO 2 -depleted impure ethylene mixture to form a raw oligomer stream;
distilling a light olefinic stream, an intermediate olefinic stream, and a heavy olefinic stream from the raw oligomer stream;
recovering a light alpha olefin from the light olefinic stream;
subjecting the heavy olefinic stream to hydrodemetallation to form a first hydro-processed stream;
alkylating the intermediate olefinic stream to form an alkylated stream;
distilling the alkylated stream to form a lights stream and a heavies stream;
recycling the lights stream to the intermediate olefinic
subjecting the first hydro-processed and the heavies stream to hydrocracking and/or hydroisomerization to form a second hydro-processed stream; and
distilling the second hydro-processed stream to form the base stock.

2. The method of claim 1 , wherein said oligomerizing the impure ethylene mixture comprises contacting the impure ethylene mixture with a homogenous catalyst comprising an iron (II) pyridine-bis-imine comprising a structure of:

wherein Rn comprises one, two, or three substituents; and wherein the substituents comprise CH 3 , F, or both.

3. The method of claim 1 , comprising:
separating an unreacted ethylene stream from the raw oligomer stream; and
recycling the unreacted ethylene stream to the CO 2 -depleted impure ethylene mixture.

4. The method of claim 1 , wherein said distilling the second hydro-processed stream comprises separating a distillate stream, a naphtha stream, or both from the second hydro-processed stream.

5. The method of claim 1 , wherein said distilling the second hydro-processed stream comprises forming a heavy neutral oil stock stream, a medium neutral oil stock stream, or a light neutral oil stock stream, or any combinations thereof.

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Cao Guang
• Dakka Jihad M
• Ho Suzzy C
• Weiss Brian M

Classifications

• C10G67/02 Primary

  plural serial stages only · CPC title

• C10G2400/10

  Lubricating oil · CPC title

• B01J31/1815

  with more than one complexing nitrogen atom, e.g. bipyridyl, 2-aminopyridine · CPC title

• C10G47/02

  characterised by the catalyst used · CPC title

• C10G50/02

  of hydrocarbon oils for lubricating purposes · CPC title