PRODUCTION OF UPGRADED EXTRACT AND RAFFINATE

• US 20170342330A1
• Filed: 05/19/2017
• Published: 11/30/2017
• Est. Priority Date: 05/25/2016
• Status: Active Grant

• Current Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Original Assignee: ExxonMobil Research & Engineering Company (Exxon Mobil Corporation)
• Inventors: Umansky, Benjamin S., Aldous, Keith K., Gleeson, James W., Blok, Edward J., Demmin, Richard A.
• Granted Patent: US 10,450,517 B2
• Time in Patent Office: Days
• CPC Class Codes: C10G 21/00 Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents C10G17/00, C10G19/00 take precedence
• CPC Class Codes: C10G 2300/10 Feedstock materials
• CPC Class Codes: C10G 2300/202 Heteroatoms content, i.e. S, N, O, P
• CPC Class Codes: C10G 2300/301 Boiling range
• CPC Class Codes: C10G 2300/304 Pour point, cloud point, cold flow properties
• CPC Class Codes: C10G 2400/04 Diesel oil
• CPC Class Codes: C10G 2400/30 Aromatics
• 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 45/10 containing platinum group metals or compounds thereof
• CPC Class Codes: C10G 45/22 with hydrogen dissolved or suspended in the oil
• CPC Class Codes: C10G 45/58 to change the structural skeleton of some of the hydrocarbon content without cracking the other hydrocarbons present, e.g. lowering pour point; Selective hydrocracking of normal paraffins C10G32/00 takes precedence; improving or increasing the octane number or aromatic content of naphtha C10G35/00
• CPC Class Codes: C10G 45/72 Controlling or regulating
• CPC Class Codes: C10G 47/02 characterised by the catalyst used
• CPC Class Codes: C10G 49/26 Controlling or regulating
• CPC Class Codes: C10G 67/0418 The hydrotreatment being a hydrorefining
• CPC Class Codes: C10G 67/14 including at least two different refining steps in the absence of hydrogen

Abstract

Systems and methods are provided for producing upgraded raffinate and extract products from lubricant boiling range feeds and/or other feeds having a boiling range of 400° F. (204° C.) to 1500° F. (816° C.) or more. The upgraded raffinate and/or extract products can have a reduced or minimized concentration of sulfur, nitrogen, metals, or a combination thereof. The reduced or minimized concentration of sulfur, nitrogen, and/or metals can be achieved by hydrotreating a suitable feed under hydrotreatment conditions corresponding to relatively low levels of feed conversion. Optionally, the feed can also dewaxed, such as by catalytic dewaxing or by solvent dewaxing. Because excessive aromatic saturation is not desired, the pressure for hydrotreatment (and optional dewaxing) can be 500 psig (˜3.4 MPa) to 1200 psig (˜8.2 MPa).

Claims

1. A method for forming a raffinate and an extract, comprising:

hydrotreating a feedstock having a T5 boiling point of at least 400°

F. and a T95 boiling point of 1500°

F. or less under hydrotreating conditions comprising less than 15% feed conversion relative to a conversion temperature of 700°

F. to form a hydrotreated effluent, the feedstock having a 650°

F.+ aromatics content of 25 wt % to 90 wt % and a sulfur content of greater than 1000 wppm, the hydrotreated effluent comprising a hydrotreated effluent fraction having a T5 boiling point of at least 400°

F., an aromatics content of at least 10 wt %, a sulfur content of less than 1000 wppm, and a combined amount of Ni, V, and Fe of less than 10 wppm; and

performing a solvent extraction on the hydrotreated effluent fraction to form at least a raffinate product having a nitrogen content of less than 50 wppm and an extract product comprising at least 70 wt % aromatics.

2. The method of claim 1, wherein the raffinate product has a nitrogen content of 10 wppm or less.

3. The method of claim 1, further comprising dewaxing at least a portion of the hydrotreated effluent fraction prior to performing the solvent extraction.

4. The method of claim 1, further comprising dewaxing at least a portion of the raffinate product.

5. The method of claim 4, wherein the dewaxing comprises solvent dewaxing, catalytic dewaxing, or a combination thereof.

6. The method of claim 1, wherein the hydrotreating conditions comprise exposing the separated fraction to a hydrotreating catalyst at a pressure of 500 psig to 1200 psig, a temperature of 300°

C. to 450°

C., and a LHSV of 0.1 to 5.0 hr<sup>−

1</sup>.

7. The method of claim 1, wherein the feedstock has a sulfur content of at least 2.0 wt %.

8. The method of claim 1, wherein the feedstock has a 650°

F.+ aromatics content of less than 50 wt %, and the raffinate product having an aromatics content of 2 wt % to 20 wt %.

9. The method of claim 1, wherein the feedstock has a 650°

F.+ aromatics content of 50 wt % to 90 wt %.

10. The method of claim 1, wherein the hydrotreated effluent fraction has a naphthene content of 30 wt % to 80 wt %, and the extract product having a naphthene content of at least 10 wt %.

11. The method of claim 1, wherein the feedstock has a nitrogen content of less than 1000 wppm, and wherein the extract product has a nitrogen content of less than 1000 wppm.

12. A raffinate product having a pour point of 0°

C. or less comprising at least 55 wt % of total naphthenes, 6 wt % to 15 wt % of 4+-ring naphthenes, less than 1000 wppm of sulfur, less than 50 wppm of nitrogen, and less than 3.0 wt % of polycyclic aromatics.

13. The raffinate product of claim 12, wherein the raffinate product has a metals content of less than 10 wppm.

14. The raffinate product of claim 12, the raffinate product comprising 2 wt % to 20 wt % of total aromatics.

15. The raffinate product of claim 12, wherein the raffinate product comprises 9 wt % to 17 wt % of 3-ring naphthenes, 6 wt % to 8 wt % of 4+-ring naphthenes, or wherein the raffinate product comprises 60 wt % to 75 wt % of total naphthenes, or a combination thereof.

16. The raffinate product of claim 12, wherein the raffinate product has a pour point of −

9°

C. or less.

17. An extract product comprising at least 70 wt % aromatics, 15 wt % to 20 wt % of 4-ring aromatics, less than 15 wt % of 3-ring aromatics, and less than 1000 wppm of sulfur, the extract product having a T5 boiling point of at least 400°

C., and a T95 boiling point of 560°

C. or less.

18. The extract product of claim 17, wherein the extract product has a metals content of less than 10 wppm.

19. The extract product of claim 17, wherein the extract product has a nitrogen content of less than 1000 wppm.

20. The extract product of claim 17, wherein the extract product has a total napthene content of 10 wt % to 20 wt %.