Process for producing diesel with low levels of sulfur

Patent metadata

Field	Value
Publication number	US-10669490-B2
Application number	US-201715401400-A
Country	US
Kind code	B2
Filing date	Jan 9, 2017
Priority date	Jan 25, 2016
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

This disclosure relates to a process for producing diesel with reduced levels of sulfur. The process involves (a) providing a diesel feed comprising a diesel having a sulfur content in the range of about 20 to about 10,000 wppm; (b) feeding the diesel feed and a hydrogen rich gas to a reaction zone comprising a hydrotreating catalyst to produce a hydrotreated diesel effluent comprising diesel and hydrogen sulfide; and (c) removing hydrogen sulfide from the hydrotreated diesel effluent to produce a diesel product having a sulfur content no more than about 100 wppm; wherein hydrogen consumption in the reaction zone is in the range of about −150 to about 150 scf/bbl.

First claim

What is claimed is:

1. A process for producing diesel with reduced levels of sulfur, comprising:
(a) providing a diesel feed comprising a diesel having a sulfur content in the range of about 20 to about 10,000 wppm;
(b) feeding the diesel feed and a hydrogen rich gas to a reaction zone comprising a hydrotreating catalyst to produce a hydrotreated diesel effluent comprising diesel and hydrogen sulfide; and
(c) removing hydrogen sulfide from the hydrotreated diesel effluent to produce a diesel product having a sulfur content no more than about 20 wppm;

wherein hydrogen consumption in the reaction zone is in the range of about −50 to about 50 scf/bbl, and wherein the reaction zone is a three-phase reaction zone.

2. The process of claim 1 , wherein the reaction zone has a temperature from about 260° C. to about 382° C. and a pressure from about 100 to about 1300 psig.

3. The process of claim 1 , wherein the diesel product has a sulfur content no more than about 10 wppm.

4. The process of claim 1 , wherein the hydrogen consumption in the reaction zone is in the range of about 5 to about 50 scf/bbl.

5. The process of claim 1 , wherein naphtha yield is no more than about 2 wt %, and yield of the diesel product is at least about 95 wt %.

6. The process of claim 1 , wherein the diesel feed has a sulfur content in the range of about 50 to about 2,000 wppm.

7. A liquid-full process for producing diesel with reduced levels of sulfur, comprising:
(a) providing a diesel feed comprising a diesel having a sulfur content in the range of about 20 to about 10,000 wppm;
(b) contacting the diesel feed with (i) a diluent and (ii) a hydrogen rich gas to form a feed/diluent/hydrogen mixture, wherein the hydrogen is dissolved in the mixture to provide a liquid feed;
(c) contacting the feed/diluent/hydrogen mixture with a hydrotreating catalyst in a liquid-full reaction zone to produce a hydrotreated diesel effluent comprising diesel and hydrogen sulfide;
(d) optionally recycling a portion of the hydrotreated diesel effluent as a hydrocarbon recycle stream for use as all or part of the diluent in step (b)(i) at a recycle ratio of no more than about 10; and
(e) removing hydrogen sulfide from at least a portion of the hydrotreated diesel effluent not recycled to produce a diesel product having a sulfur content no more than about 20 wppm;

wherein hydrogen consumption in the reaction zone is in the range of about −50 to about 50 scf/bbl.

8. The liquid-full process of claim 7 , wherein the at least a portion of the hydrotreated diesel effluent not recycled is further hydrotreated prior to the hydrogen sulfide removal step (e).

9. The liquid-full process of claim 7 , wherein a portion of the hydrotreated diesel effluent is recycled as a hydrocarbon recycle stream for use as all or part of the diluent in step (b)(i) at a recycle ratio of no more than about 10.

10. The liquid-full process of claim 9 , wherein the recycle ratio is from about 0.1 to about 5.

11. The liquid-full process of claim 9 , wherein the diluent consists essentially of the hydrocarbon recycle stream.

12. The liquid-full process of claim 7 , wherein the hydrotreating catalyst comprises a non-precious metal and an oxide support.

13. The liquid-full process of claim 7 , wherein the diesel product has a sulfur content no more than about 10 wppm.

14. The liquid-full process of claim 7 , wherein the hydrogen consumption in the reaction zone is in the range of about 5 to about 50 scf/bbl.

15. The process of claim 7 , wherein the diesel feed has a sulfur content in the range of about 50 to about 2,000 wppm.

16. A liquid-full process for producing diesel with reduced levels of sulfur, comprising:
(a) providing a diesel feed comprising a diesel having a sulfur content in the range of about 20 to about 10,000 wppm;
(b) contacting the diesel feed with a hydrogen rich gas to form a feed/hydrogen mixture, wherein the hydrogen is dissolved in the mixture to provide a liquid feed, and the mixture is not diluted with a diluent;
(c) contacting the feed/hydrogen mixture with a hydrotreating catalyst in a liquid-full reaction zone to produce a hydrotreated diesel effluent comprising diesel and hydrogen sulfide; and
(d) removing hydrogen sulfide from the hydrotreated diesel effluent to produce a diesel product having a sulfur content no more than about 20 wppm;

wherein hydrogen consumption in the reaction zone is in the range of about −50 to about 50 scf/bbl, and no hydrotreated diesel effluent is recycled as a recycle stream.

17. The liquid-full process of claim 16 , wherein the hydrotreating catalyst comprises a non-precious metal and an oxide support.

18. The liquid-full process of claim 16 , wherein the diesel product has a sulfur content no more than about 10 wppm.

19. The liquid-full process of claim 16 , wherein the hydrogen consumption in the reaction zone is in the range of about 5 to about 50 scf/bbl.

20. The liquid-full process of claim 16 , wherein the liquid-full reaction zone has a temperature from about 260° C. to about 382° C. and a pressure from about 100 to about 1300 psig.

21. The liquid-full process of claim 16 , wherein naphtha yield is no more than about 5 wt %.

22. The process of claim 16 , wherein the diesel feed has a sulfur content in the range of about 50 to about 2,000 wppm.

Assignees

• Dupont Ind Biosciences Usa Llc

Inventors

• Dindi Hasan

Classifications

• C10G45/08 Primary

  in combination with chromium, molybdenum, or tungsten metals, or compounds thereof · CPC title

• C10L1/08

  for compression ignition · CPC title

• C10G2400/04

  Diesel oil · CPC title

• C10G67/02

  plural serial stages only · CPC title

• C10G2300/207

  Acid gases, e.g. H2S, COS, SO2, HCN · CPC title