Catalysts and processes for converting aromatics

Patent metadata

Field	Value
Publication number	US-12239964-B2
Application number	US-202017436187-A
Country	US
Kind code	B2
Filing date	Mar 26, 2020
Priority date	Mar 29, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

Methods and corresponding catalysts are provided for conversion of an aromatic feed containing C 8+ aromatics (particularly C 9+ aromatics) to form a converted product mixture comprising, e.g., benzene and/or xylenes. The aromatic feed can be converted in the presence of a catalyst that includes a silica binder, a mixture of a first zeolite having an MEL framework (such as ZSM-11 and/or an MFI framework (such as ZSM-5), and a second zeolite having an MOR framework, such as mordenite, particularly a mordenite synthesized using TEA or MTEA as a structure directing agent, and a metal. The catalyst can further include one or more metals supported on the catalyst.

First claim

The invention claimed is:

1. A method for converting a feedstock comprising C 8+ aromatics, comprising:
contacting the feedstock and optionally hydrogen with a catalyst composition under conversion conditions in a reactor comprising at least one fixed catalyst bed of the catalyst composition to produce a converted product mixture,
wherein the catalyst composition comprises:
(i) a zeolite mixture comprising ZSM-11, and ZSM-5, wherein a SiO 2 /Al 2 O 3 molar ratio of the ZSM-5 is greater than or equal to 21:1, wherein a weight ratio of the ZSM-11 and the ZSM-5 is 0.3 to 0.6;
(ii) a combination of a first metal in Groups 7-10 and a second metal in Groups 2, and 11 to 15 in the Periodic Table of Elements; and
(iii) a silica binder, wherein the silica binder comprises a mixed silica.

2. The method of claim 1 , wherein the ZSM-5 has a mesopore surface area of greater than 30 m 2 /g.

3. The method of claim 1 , wherein a weight ratio of the ZSM-11 and the ZSM-5 is 0.36 to 0.44.

4. The method of claim 1 , wherein the first metal comprises Ni, Pd, Pt, or a combination of two or more thereof.

5. The method of claim 1 , wherein the catalyst composition comprises 0.005 wt % to 0.1 wt % Pt, based on the total weight of the catalyst composition.

6. The method of claim 1 , wherein the catalyst composition comprises 0.02 wt % to 0.1 wt % of the first metal, based on the total weight of the catalyst composition.

7. The method of claim 1 , wherein the second metal comprises Sn, Mg, Ga, Re, Ag, Cu, or a combination of two or more thereof.

8. The method of claim 1 , wherein the catalyst composition comprises from 10 wt % to 90 wt % of the silica binder, based on the total weight of the catalyst composition.

9. The method of claim 1 , wherein the catalyst composition comprises from 20 to 80 wt % of the silica binder, based on the total weight of the catalyst composition.

10. The method of claim 1 , wherein feedstock comprises C 9+ aromatics and at least one of benzene and toluene, and the converted product mixture comprises xylenes.

11. The method of claim 1 , wherein contacting the feedstock with the catalyst composition is effected in the presence of hydrogen.

12. The method of claim 1 , wherein the conversion conditions comprise a temperature of 340° C. to 515° C., a pressure from 380 kPa-a (55 psia) to 4240 kPa-a (615 psia) and a weight hourly space velocity (WHSV) in the range of 1 to 100 hr −1 based on the weight of the feedstock.

13. The method of claim 1 , wherein the first metal is Pt and wherein the second metal is Sn.

14. The method of claim 13 , wherein a molar ratio of the second metal to the first metal is 1.0 to 7.0.

15. The method of claim 13 , wherein a molar ratio of the second metal to the first metal is 6.0.

16. A catalyst composition, comprising:
(i) a zeolite mixture comprising ZSM-11, and ZSM-5, wherein a SiO 2 /Al 2 O 3 molar ratio of the ZSM-5 is greater than or equal to 21:1, wherein a weight ratio of the ZSM-11 and the ZSM-5 is 0.3 to 0.6;
(ii) a combination of a first metal in Groups 7-10 and a second metal in Groups 2, and 11 to 15 in the Periodic Table of Elements; and
(iii) a silica binder, wherein the silica binder comprises a mixed silica.

17. The catalyst composition of claim 16 , wherein the ZSM-5 has a mesopore surface area of greater than 30 m 2 /g.

18. The catalyst composition of claim 16 , wherein the weight ratio of the ZSM-11 to the ZSM-5 is from 0.1 to 1.0.

19. The catalyst composition of claim 16 , wherein the first metal comprises Ni, Pt, Pd, or a combination of two or more thereof.

20. The catalyst composition of claim 16 , comprising 0.005 wt % to 0.1 wt % Pt, based on the total weight of the catalyst composition.

21. The catalyst composition of claim 16 , comprising from 0.02 wt % to 0.1 wt % of Pt, based on the total weight of the catalyst composition.

22. The catalyst composition of claim 16 , wherein the second metal comprises Sn, Mg, Ga, Re, Ag, Cu, or a combination of two or more thereof.

23. The catalyst composition of claim 16 , comprising from 10 wt % to 90 wt % of the silica binder, based on the total weight of the catalyst composition.

24. The catalyst composition of claim 16 , comprising from 20 to 80 wt % of the silica binder, based on the total weight of the catalyst composition.

Assignees

• Exxonmobil Chemical Patents Inc
• Exxonmobil Engineering & Tech Company

Inventors

• Gatt Joseph E
• Peer Maryam
• Fassbender Natalie A
• Knaeble William J
• Gilcrest Jocelyn A
• Lai Wenyih F
• Podsiadlo Paul
• Ferro Thomas J
• Levin Doron
• Gamoke Benjamin C

Classifications

• B01J35/613

  10-100 m2/g · CPC title

• C07C2529/46

  Iron group metals or copper · CPC title

• C07C6/126

  of more than one hydrocarbon · CPC title

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title