Process for producing tailored synthetic crude oil that optimize crude slates in target refineries

• US 7,799,207 B2
• Filed: 03/10/2006
• Issued: 09/21/2010
• Est. Priority Date: 03/10/2006
• Status: Expired due to Fees

• Current Assignee: Chevron USA Incorporated (Chevron Corp.)
• Original Assignee: Chevron USA Incorporated (Chevron Corp.)
• Inventors: Munson, Curtis, Allinson, Paul A.
• Primary Examiner(s): Caldarola; Glenn
• Assistant Examiner(s): Singh; Prem C.
• Application Number:
  US11/373,589
• Publication Number:
  US 20070209967A1
• Time in Patent Office: 1,656 Days
• Field of Search: 208/57, 208/58, 208/108, 208/215, 364/149, 364/578, 364/150, 364/151, 502/219, 502/220, 502/221
• US Class Current: 208/58
• CPC Class Codes: C10G 2400/08 Jet fuel
• CPC Class Codes: C10G 45/02 to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
• CPC Class Codes: C10G 45/04 characterised by the catalyst used
• CPC Class Codes: C10G 65/02 plural serial stages only

Abstract

The instant invention is directed to a process wherein a heavy oil feedstock upgrader alters its mode of operation of its full conversion hydroprocessing unit to create a custom tailored synthetic crude feedstock based upon data communicated from a target refinery and data communicated from the heavy oil feedstock upgrader. The data from the target refinery is data that represents refining process data and linear program modeling along with analysis by a refining planner to calculate the optimum “synthetic trim crude” that will optimize the effective use of the target refinery'"'"'s capacity and equipment.

Claims

1. An integrated process for upgrading a heavy oil feedstock, comprising:

a) establishing a communication link between an upgrading facility and a target refinery;

b) acquiring a refining data set from the target refinery that characterizes a tailored synthetic crude having a 95% boiling point as determined by ASTM D1160 of less than 1000°

F. and API gravity of greater than 10;

c) generating a feedstock data set from the upgrading facility that characterizes a heavy oil feedstock having a 95% boiling point as determined by ASTM D1160 of greater than 1000°

F.;

d) using the refining data set from the target refinery and the feedstock data set from the upgrading facility to generate an upgrading dataset of select upgrading process conditions;

e) upgrading the heavy oil feedstock at the select upgrading process conditions within the upgrading facility and recovering a tailored synthetic crude, wherein the upgrading comprises contacting the heavy oil feedstock with hydrogen in the presence of an active unsupported slurry catalyst

wherein the active unsupported slurry catalyst in oil is a catalyst composition prepared by;

a) mixing a Group VI B metal oxide and aqueous ammonia to form a Group VI metal compound aqueous mixture;

b) sulfiding, in a first reaction zone, the aqueous mixture with a gas comprising hydrogen sulfide to a dosage greater than 8 SCF of hydrogen sulfide per pound of Group VIB metal to form a slurry;

c) promoting the slurry with a Group VIII metal;

d) mixing the promoted slurry with a first hydrocarbon oil having a viscosity of at least 2 cSt at 212°

F. to form a reaction mixture;

e) combining the reaction mixture with hydrogen gas and a second hydrocarbon oil in a second reaction zone to form an active catalyst composition, the second hydrocarbon oil having a boiling point in the range from 50°

F. to 300°

F. and further having a lower viscosity than the first hydrocarbon oil; and

f) transporting the tailored synthetic crude to the target refinery.

2. The integrated process according to claim 1, wherein the heavy oil feedstock has a 50 percent boiling point of greater than 1000°

F.

3. The integrated process according to claim 2, wherein the heavy oil feedstock has a 10 percent boiling point of greater than 1000°

F.

4. The integrated process according to claim 1, wherein the step (e) of upgrading the heavy oil feedstock comprises hydrotreating the heavy oil feedstock at conditions sufficient to reduce the sulfur content and the 95 percent boiling point of the heavy oil feedstock, to produce the tailored synthetic crude.

5. The integrated process according to claim 4, wherein the tailored synthetic crude has a sulfur content of less than 2 percent by weight.

6. The integrated process according to claim 5, wherein the tailored synthetic crude has a sulfur content in the range of 0.2 to 2.0 percent by weight.

7. The integrated process according to claim 1, wherein the active unsupported slurry catalyst in oil comprises molybdenum sulfide.

8. The integrated process according to claim 1, wherein the heavy oil feedstock is processed in the presence of from about 100 ppm to about 20,000 ppm of the unsupported slurry catalyst, expressed as weight of molybdenum metal to weight of heavy oil feedstock.

9. The integrated process according to claim 1 wherein the heavy oil feedstock is derived from at least one of the following sources:

tar sands and bitumen;

coal, lignite, peat and oil shale;

crude oil;

topped crude oil;

synthetic oils such as from a Fischer-Tropsch process;

recycled oil wastes and polymers; and

residuum bottom process stream oils.

10. The integrated process according to claim 1, wherein the communication link between the upgrading facility and the target refinery is selected from the group consisting of telephone, fax, cellular, intranet, internet, microwave, satellite, radio, computer.

11. The integrated process according to claim 1, wherein the refining dataset comprises modeling data, process data, planning data, and analysis input data.

12. The integrated process according to claim 1 step (c), wherein the upgrading dataset comprises modeling data, process data, planning data, and analysis input data.

13. The integrated process according to claim 1, wherein the heavy oil feedstock is treated prior to the upgrading of step (e).

14. The integrated process according to claim 13, wherein the treating step prior to upgrading comprises at least one of fluid coking, Flexicoking, hydrocracking, hydrotreating, hydrofinishing, hydrodesulphurization, hydrodenitrification, or hydrodewaxing.

15. The integrated process according to claim 1, wherein the tailored synthetic crude is transported using at least one of railway, truck, ship, pipeline or airline transportation.

16. The integrated process according to claim 1, wherein the tailored synthetic crude is converted to at least one liquid fuel product in the target refinery.

17. The integrated process according to claim 16, wherein at least 75 percent of the tailored synthetic crude which is transported to the target refinery is converted to liquid fuel products in the target refinery.

18. The integrated process according to claim 17, wherein at least 90 percent of the tailored synthetic crude, which is transported to the target refinery, is converted to liquid fuel products in the target refinery.

19. The integrated process according to claim 18, wherein the liquid fuel product is selected from the group consisting of gasoline, jet fuel and diesel fuel.

20. The integrated process according to claim 1, wherein the step of upgrading comprises:

a) combining, the heavy oil feedstock, hydrogen gas, the active unsupported slurry catalyst admixed in a hydrocarbon oil, and a recycle slurry composition, in an upgrading reactor under hydroprocessing conditions;

b) passing the effluent of the upgrading reactor to a separation zone and recovering an overhead product and a bottoms product, wherein the overhead product comprises material boiling at temperatures up to 900°

F.;

c) passing the bottoms product to a constantly stirred catalyst storage tank; and

d) passing at least a portion of the material in the constantly stirred catalyst storage tank back to the upgrading reactor of step (a).

21. The integrated process according to claim 1, wherein the upgrading dataset of select upgrading process conditions include at least one of:

reaction temperature, heavy oil feedstock rate, hydrogen rate, catalyst circulation rate, reaction pressure, reactor size, number of reactor modules, product separation parameters such as cutpoint, number of individual fractions recovered, characterization of at least one of the fractions recovered, and additional product upgrading steps.