Slurry hydroconversion and coking of heavy oils

Patent metadata

Field	Value
Publication number	US-9868915-B2
Application number	US-201414308867-A
Country	US
Kind code	B2
Filing date	Jun 19, 2014
Priority date	Jun 20, 2013
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

Systems and methods are provided for use of coking and slurry hydroconversion for conversion of heavy oil feeds. The combination of coking and slurry hydroconversion allows for improved yield of liquid products while reducing or minimizing the consumption of hydrogen in slurry hydroconversion reaction stages. Coking and slurry hydroconversion can be combined by segregating feeds based on Conradson carbon residue. Alternatively, slurry hydroconversion can be used to process unconverted bottoms from a coking process.

First claim

What is claimed is:

1. A method for processing a heavy oil feedstock, comprising:
providing a first heavy oil feedstock having a 10% distillation point of at least about 650° F. (343° C.) and a first Conradson carbon residue wt %;
providing a second heavy oil feedstock having a 10% distillation point of at least about 650° F. (343° C.) and a second Conradson carbon residue wt %, the second Conradson carbon residue wt % being at least 5 wt % greater than the first Conradson carbon residue wt %;
coking the first heavy oil feedstock under effective coking conditions to form at least a first plurality of liquid products and coke;
exposing the second heavy oil feedstock to a catalyst under effective slurry hydroconversion conditions to form at least a second plurality of liquid products, the effective slurry hydroconversion conditions being effective for conversion of at least about 90 wt % of the second heavy oil feedstock relative to a conversion temperature; and
wherein the first heavy oil feedstock and the second heavy oil feedstock are formed by performing a membrane separation of a third heavy oil feedstock.

2. The method of claim 1 , wherein a 10% distillation point of the first heavy oil feedstock is at least about 900° F. (482° C.).

3. The method of claim 1 , wherein the first heavy oil has a Conradson carbon residue of about 27.5 wt % or less.

4. The method of claim 1 , wherein the second heavy oil has a Conradson carbon residue of at least about 30 wt %.

5. The method of claim 1 , wherein a combined weight percentage of the first liquid products is at least about 55 wt % of the first heavy oil feedstock.

6. The method of claim 1 , wherein exposing the second heavy oil feedstock to a catalyst under effective slurry hydroconversion conditions further comprises forming an unconverted slurry hydroconversion pitch, wherein at least a portion of the unconverted slurry hydroconversion pitch is passed into a partial oxidation unit.

7. The method of claim 1 , wherein exposing the second heavy oil feedstock to a catalyst under effective slurry hydroconversion conditions further comprises forming an unconverted slurry hydroconversion pitch, wherein at least a portion of the unconverted slurry hydroconversion pitch is passed into a coker at a location that is downstream of a coker furnace.

8. The method of claim 7 , wherein coking the first heavy oil feedstock further comprises coking at least a portion of the unconverted slurry hydroconversion pitch.

9. The method of claim 1 , further comprising:
combining at least a portion of one or more of the first plurality of liquid products with at least a portion of one or more of the second plurality of liquid products;
hydroprocessing the combined liquid products; and
fractionating the combined liquid products.

10. The method of claim 9 , wherein hydroprocessing the combined liquid products comprises hydrotreating the combined liquid products.

Assignees

• Smiley Randolph J
• Kovvali Anjaneya Sarma
• Hammond David G
• Yeo Grace Shi Qian
• Exxonmobil Res & Eng Co

Inventors

• Smiley Randolph J
• Kovvali Anjaneya Sarma
• Hammond David G
• Yeo Grace Shi Qian

Classifications

• C10G9/005

  Coking (in order to produce liquid products mainly) · CPC title

• C10G31/09

  by filtration · CPC title

• C10G2300/301

  Boiling range · CPC title

• C10G69/14 Primary

  plural parallel stages only · CPC title

• C10G47/26

  suspended in the oil, e.g. slurries · CPC title