Catalyst with improved activity/selectivity for light naphtha aromatization

Patent metadata

Field	Value
Publication number	US-10583422-B2
Application number	US-201916527910-A
Country	US
Kind code	B2
Filing date	Jul 31, 2019
Priority date	Nov 22, 2013
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

In an aspect, a method for the aromatization of hydrocarbons comprises contacting a hydrocarbon feedstream with a catalyst; wherein the catalyst comprises a zeolite comprising Si, Al, and Ge in the framework with Pt deposited thereon; wherein the zeolite further comprises Na; and wherein the catalyst has an Si:Al 2 mole ratio of greater than or equal to 125, an Si:Ge mole ratio of 40 to 400, and an Na:Al mole ratio of 0.9 to 2.5, wherein the catalyst has an aluminum content of less than or equal to 0.75 wt % excluding any binder and extrusion aide.

First claim

The invention claimed is:

1. A method for the aromatization of hydrocarbons comprising:
contacting a hydrocarbon feedstream with a catalyst;
wherein the catalyst comprises a zeolite comprising Si, Al, and Ge in the framework with Pt deposited thereon; wherein the zeolite has an average pore size of 5 to 8 Å; and wherein the zeolite further comprises Na; and
wherein the catalyst has an Si:Al 2 mole ratio of greater than or equal to 125, an Si:Ge mole ratio of 40 to 400, and an Na:Al mole ratio of 0.9 to 2.5, wherein the catalyst has an aluminum content of less than or equal to 0.75 wt % excluding any binder and extrusion aide.

2. The method of claim 1 , wherein the hydrocarbon feedstream comprises an olefinic compound.

3. The method of claim 1 , wherein the hydrocarbon feedstream comprises an alkane compound.

4. The method of claim 3 , wherein the alkane compound comprises a C 6-12 alkane.

5. The method of claim 3 , wherein the alkane compound comprises a C 6-8 alkane.

6. The method of claim 5 , wherein the feed stream comprises 20 to 100 vol % of at least one of the C 6 , C 7 , or C 8 alkane.

7. The method of claim 1 , wherein the hydrocarbon feedstream comprises naphthene.

8. The method of claim 1 , wherein the hydrocarbon feedstream comprises a naphtha feed.

9. The method of claim 8 , wherein the naphtha feed comprises up to 1,000 parts per million by weight sulfur and/or up to 100 parts per million by weight of nitrogen compounds.

10. The method of claim 1 , wherein the Ge is present in an amount of 0.3 to 3 wt %, and/or the Na is present in an amount of 0.5 to 2 wt % and/or the Pt is present in an amount of 0.05 to 3 wt %, wherein the wt % values are based on the total weight of the catalyst excluding any binder and extrusion aide.

11. The method of claim 1 , wherein the catalyst has a Ge content of 0.1 to 3 wt % based on the total weight of the final catalyst excluding any binder and extrusion aide.

12. The method of claim 1 , wherein the catalyst comprises Al in an amount of 0.45 to 0.7 wt % based on the total weight of the catalyst excluding any binder and extrusion aide.

13. The method of claim 1 , wherein the Na:Al mole ratio is 1.2 to 2.2.

14. The method of claim 1 , wherein the Si:Al 2 mole ratio is 125 to 211.

15. The method of claim 1 , wherein the Si:Ge mole ratio is 50 to 300.

16. The method of claim 1 , wherein the zeolite is a ZSM-5 zeolite.

17. The method of claim 1 , wherein the contacting occurs at a liquid hourly space velocity of 0.1 to 100 hr −1 , a temperature of 200 to 950° C., and a pressure of 5 to 315 pounds per square inch absolute.

18. A method for the aromatization of hydrocarbons comprising:
contacting an olefinic feedstream with a catalyst;
wherein the catalyst comprises a zeolite comprising Si, Al, and Ge in the framework with Pt deposited thereon; wherein the zeolite further comprises Na; wherein the zeolite has an average pore size of 5 to 8 Å; and
wherein the catalyst has an Si:Al 2 mole ratio of greater than or equal to 125, an Si:Ge mole ratio of 40 to 400, and an Na:Al mole ratio of 0.9 to 2.5, wherein the catalyst has an aluminum content of less than or equal to 0.75 wt % excluding any binder and extrusion aide.

Assignees

• Saudi Basic Ind Corp

Inventors

• Khanmamedova Alla
• Stevenson Scott

Classifications

• B01J37/18

  with gases containing free hydrogen · CPC title

• C07C2529/03

  not having base-exchange properties · CPC title

• C10G45/70

  with catalysts containing platinum group metals or compounds thereof · CPC title

• C07C15/02

  Monocyclic hydrocarbons · CPC title

• C07C2529/54

  Noble metals · CPC title