Catalytic dewaxing of hydrocarbon feedstocks

Patent metadata

Field	Value
Publication number	US-10995286-B2
Application number	US-201916709205-A
Country	US
Kind code	B2
Filing date	Dec 10, 2019
Priority date	Dec 21, 2018
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

In a process for improving the cold flow properties of a hydrocarbon feedstock, the feedstock is contacted with a catalyst composition comprising an EMM-17 molecular sieve and a hydrogenation component under dewaxing conditions effective to produce a dewaxed product having a cloud point and/or pour point that is reduced relative to the cloud point and/or pour point of the feedstock by at least 5° C.

First claim

The invention claimed is:

1. A process for improving the cold flow properties of a hydrocarbon feedstock, the process comprising:
contacting a feedstock comprising a sulfur content of greater than 10 ppm by weight and a nitrogen content of greater than 10 ppm by weight with a catalyst composition comprising an EMM-17 molecular sieve and a hydrogenation component under dewaxing conditions effective to produce a dewaxed product having a cloud point and/or pour point that is reduced relative to the cloud point and/or pour point of the feedstock by at least 5° C.

2. The process of claim 1 , wherein the hydrocarbon feedstock comprises a distillate fraction having an initial boiling point of at least 95° C. and a final boiling point 455° C. or less.

3. The process of claim 1 , wherein the hydrocarbon feedstock comprises a lubricant basestock having an initial boiling point of at least 220° C. and a final boiling point up to 650° C.

4. The process of claim 1 , wherein the hydrocarbon feedstock comprises up to 2.0 wt. % sulfur and up to 500 ppm by weight nitrogen.

5. The process of claim 1 , wherein the dewaxing conditions comprise a temperature of from 200 to 450° C., a hydrogen partial pressure of from 1.4 MPag to 34.6 MPag (200 psig to 5000 psig), and a hydrogen treat gas to feed rate of from 35.6 m 3 /m 3 (200 SCF/B) to 1781 m 3 /m 3 (10,000 scf/B).

6. The process of claim 1 , wherein the dewaxing conditions comprise a temperature of from 270 to 400° C., a hydrogen partial pressure of from 4.8 MPag to 20.7 MPag, and a hydrogen treat gas to feed rate of from 178 m 3 /m 3 (1000 SCF/B) to 890.6 m 3 /m 3 (5000 SCF/B).

7. The process of claim 1 , wherein the EMM-17 molecular sieve comprises an aluminosilicate.

8. The process of claim 7 wherein the molecular sieve has a silica to alumina molar ratio of at least 50.

9. The process of claim 7 , wherein the catalyst is steamed prior to the contacting to reduce the framework aluminum content of the molecular sieve.

10. The process of claim 1 , wherein the hydrogenation component comprises at least one metal or compound thereof from Groups 6 to 12 of the Periodic Table of the Elements.

11. The process of claim 1 , wherein the dewaxing catalyst comprises from 5 to 80 wt. % of the hydrogenation component.

12. The process of claim 1 , wherein the dewaxing catalyst further comprises at least 5% by weight of a binder.

13. A process for improving the cold flow properties of a hydrocarbon feedstock, the process comprising:
(a) contacting the feedstock with a first hydrotreating catalyst composition under conditions effective to reduce at least one of the sulfur, nitrogen or aromatic content of the feedstock and produce a hydrotreated product comprising no more than 10 ppm by weight of nitrogen and no more than 10 ppm by weight of sulfur; and
(b) contacting the hydrotreated product with a second catalyst composition different from the first catalyst composition and comprising an EMM-17 molecular sieve and a hydrogenation component under dewaxing conditions effective to produce a dewaxed product having a cloud point and/or pour point that is reduced relative to the cloud point and/or pour point of the feedstock by at least 5° C.

14. The process of claim 13 , wherein the first hydrotreating catalyst composition comprises a metal or compound thereof from Groups 6 and 8 to 10 of the Periodic Table on a refractory metal oxide support.

15. The process of claim 13 , wherein the contacting steps (a) and (b) are conducted in a single reactor.

16. The process of claim 13 , wherein the contacting steps (a) and (b) are conducted in separate reactors.

17. The process of claim 13 , wherein the dewaxing conditions comprise a temperature of from 200 to 450° C., a hydrogen partial pressure of from 1.4 MPag to 34.6 MPag (200 psig to 5000 psig), and a hydrogen treat gas to feed rate of from 35.6 m 3 /m 3 (200 SCF/B) to 1781 m 3 /m 3 (10,000 scf/B).

18. The process of claim 13 , wherein the metal hydrogenation component comprises Pt, Pd, or a combination thereof.

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Gatt Joseph E
• Lonergan William W
• Weigel Scott J
• Johnson Ivy D
• Strohmaier Karl G
• Weston Simon C

Classifications

• B01J29/70

  of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 · CPC title

• B01J2229/42

  Addition of matrix or binder particles · CPC title

• C10G65/043

  at least one step being a change in the structural skeleton · CPC title

• C10G73/34 Primary

  Controlling or regulating · CPC title

• B01J2229/16

  to increase the Si/Al ratio; Dealumination · CPC title