Method and system for producing low aromatic hydrocarbon products

Patent metadata

Field	Value
Publication number	US-10227535-B2
Application number	US-201615198397-A
Country	US
Kind code	B2
Filing date	Jun 30, 2016
Priority date	Jun 9, 2014
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

Methods are provided for modifying hydrogenation catalysts having silica supports (or other non-alumina supports) with additional alumina, and using such catalysts to achieve unexpectedly superior hydrogenation of feedstocks. The modified hydrogenation catalysts can have a relatively low cracking activity while providing an increased activity for hydrogenation.

First claim

What is claimed is:

1. A method for hydrogenating a feedstock, comprising:
exposing a feedstock comprising a hydrocarbonaceous feed to a supported catalyst under effective hydrogenation conditions to form a hydrogenated effluent, the supported catalyst comprising 0.1 wt % to 5.0 wt % of a Group VIII noble metal on a silica support, the supported catalyst further comprising about 0.3 wt % to about 2.5 wt % alumina deposited on the silica support, the supported catalyst having a ratio of aluminum atoms in tetrahedral sites to octahedral sites of at least 1.0, wherein the hydrogenation includes saturation of aromatics and/or olefins.

2. The method of claim 1 , wherein the hydrocarbonaceous feed comprises a diesel boiling range fraction.

3. The method of claim 1 , wherein the hydrocarbonaceous feed comprises equal to or less than about 50 wppm of sulfur.

4. The method of claim 1 , wherein the supported catalyst comprises about 0.3 wt % to about 2.1 wt % alumina deposited on the silica support.

5. The method of claim 1 , wherein the supported catalyst comprises about 0.5 wt % to about 2.2 wt % alumina deposited on the silica support.

6. The method of claim 1 , wherein the effective hydrogenation conditions comprise a temperature from about 75° C. to about 425° C.; a hydrogen partial pressure from about 100 psi (0.7 MPa) to about 3000 psi (20.7 MPa); a liquid hourly space velocity from about 0.1 hr-1 to about 5 hr-1 LHSV; and a hydrogen treat gas rate of from about 36 Sm 3 /m 3 to about 1780 Sm 3 /m 3 (200 SCF/bbl to 10000 SCF/bbl).

7. The method of claim 1 , wherein the Group VIII noble metal comprises Pt.

8. The method of claim 7 , wherein the Group VIII noble metal further comprises one or more of Pd, Ir, or Rh, a molar ratio of Pt to the one or more of Pd, Ir, or Rh being at least about 1:1.

9. The method of claim 1 , further comprising:
processing a stream with a second catalyst under second hydroprocessing conditions to produce a hydrotreated product; and
fractionating the hydrotreated product to obtain the hydrocarbonaceous feed exposed to the supported catalyst.

10. The method of claim 1 , wherein the hydrocarbonaceous feed is exposed to the supported catalyst under effective hydrogenation conditions to produce a diesel fuel product having an increased cetane index relative to the hydrocarbonaceous feed, calculated by ASTM D976, by at least 3.0.

11. The method of claim 1 , wherein the hydrocarbonaceous feed is exposed to the supported catalyst under effective hydrogenation conditions to produce a diesel fuel product having an increased cetane index relative to the hydrocarbonaceous feed, calculated by ASTM D4737 Procedure A, by at least 3.5.

12. The method of claim 1 , wherein the hydrocarbonaceous feed is exposed to the supported catalyst under effective hydrogenation conditions to produce a diesel fuel product having an increased cetane index relative to the hydrocarbonaceous feed, calculated by ASTM D4737 Procedure B, by at least 3.7.

13. The method of claim 1 , wherein the hydrocarbonaceous feed has an aromatic content of at least 30 wt %.

14. The method of claim 13 , wherein the hydrocarbonaceous feed is exposed to the supported catalyst under effective hydrogenation conditions to produce a diesel fuel product having an aromatic content of about 5 wt % to about 30 wt %.

15. The method of claim 1 , wherein the hydrocarbonaceous feed has a T5 boiling point of at least 110° C.

16. The method of claim 1 , wherein the hydrocarbonaceous feed is exposed to the supported catalyst under effective hydrogenation conditions to produce a diesel fuel product having a volume swell of at least 1.6% relative to the hydrocarbonaceous feed.

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Lanci Michael P
• Soled Stuart L
• Guzman Javier
• Miseo Sabato
• Green Thomas E
• Baumgartner Joseph E
• Zhang Lei
• Kliewer Christine E
• Koziol Lukasz
• Mao Kanmi
• Owens Tracie L
• Schleicher Gary P
• Xu Xiaochun

Classifications

• C10G45/52 Primary

  containing platinum group metals or compounds thereof · CPC title

• B01J23/468

  Iridium · CPC title

• B01J23/42

  Platinum · CPC title

• C10G2300/307

  Cetane number, cetane index · CPC title

• B01J37/0201

  Impregnation · CPC title