Methods for producing xylenes with limited ethylbenzene production

Patent metadata

Field	Value
Publication number	US-12098121-B2
Application number	US-202318165626-A
Country	US
Kind code	B2
Filing date	Feb 7, 2023
Priority date	Feb 7, 2023
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A method for producing one or more of benzene, toluene, or xylene may include contacting a feed stream including C 9+ alkylaromatic hydrocarbons with a catalyst mixture to form one or more of benzene, toluene, or xylene. The catalyst mixture may include mesoporous zeolite Beta, ZSM-5 zeolite, one or more active metals, and binder material. The feed stream may include C 9+ alkylaromatic hydrocarbons in an amount of at least 10 wt. %. The weight ratio of mesoporous zeolite Beta to ZSM-5 zeolite may be from 2 to 4.

First claim

What is claimed is:

1. A method for producing one or more of benzene, toluene, or xylene, the method comprising:
contacting a feed stream comprising C 9+ alkylaromatic hydrocarbons with a catalyst mixture to form one or more of benzene, toluene, or xylene, the catalyst mixture comprising:
mesoporous zeolite Beta;
ZSM-5 zeolite;
one or more active metals; and
binder material; and

wherein:
the feed stream is a heavy reformate and comprises at least 20 wt. % toluene;
the feed stream comprises C 9+ alkylaromatic hydrocarbons in an amount of at least 10 wt. %;
the weight ratio of mesoporous zeolite Beta to ZSM-5 zeolite is from 2 to 4;
a product stream is formed by the contacting of the feed stream with the catalyst mixture; and
the product stream comprises less than or equal to 0.5 wt. % ethylbenzene.

2. The method of claim 1 , wherein the weight ratio of mesoporous zeolite Beta to ZSM-5 zeolite is from 3 to 4.

3. The method of claim 1 , wherein the amount of mesoporous zeolite Beta relative to the total weight of the catalyst mixture is from 40 wt. % to 60 wt. %.

4. The method of claim 1 , wherein the amount of ZSM-5 zeolite relative to the total weight of the catalyst mixture is from 5 wt. % to 25 wt. %.

5. The method of claim 1 , wherein the amount of binder material relative to the total weight of the catalyst mixture is from 20 wt. % to 45 wt. %.

6. The method of claim 1 , wherein the binder material comprises aluminum.

7. The method of claim 1 , wherein the binder material comprises aluminum in an amount of at least 50 wt. %.

8. The method of claim 1 , wherein the amount of active metals relative to the total weight of the catalyst mixture is from 1 wt. % to 10 wt. %.

9. The method of claim 1 , wherein the active metals comprise one or more of molybdenum, platinum, nickel, cobalt, or combinations thereof.

10. The method of claim 1 , wherein the feed stream is contacted by the catalyst mixture at a temperature of from 50° C. to 600° C.

11. The method of claim 1 , wherein the feed stream comprises one or more of propylbenzenes, ethylmethylbenzenes, tetramethylbenzenes, ethyldimethylbenzenes, trimethylbenzenes, or diethylbenzenes, methylpropylbenzenes.

12. The method of claim 1 , wherein:
the amount of mesoporous zeolite Beta relative to the total weight of the catalyst mixture is from 40 wt. % to 60 wt. %;
the amount of ZSM-5 zeolite relative to the total weight of the catalyst mixture is from 5 wt. % to 25 wt. %;
the amount of binder material relative to the total weight of the catalyst mixture is from 20 wt. % to 45 wt. %;
the binder material comprises aluminum in an amount of at least 50 wt. %;
the amount of active metals relative to the total weight of the catalyst mixture is from 1 wt. % to 10 wt. %; and
the active metals comprise one or more of molybdenum, platinum, nickel, cobalt, or combinations thereof.

Assignees

• Saudi Arabian Oil Co

Inventors

• Tammana Veera Venkata Ramakrishna
• Zhang Ke
• Shaikh Sohel
• Al-Sayed Essam A
• Sun Miao

Classifications

• C07C4/18

  Catalytic processes · CPC title

• C07C2529/48

  containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium · CPC title

• C07C2529/44

  Noble metals · CPC title

• C07C6/123

  of only one hydrocarbon · CPC title

• C07C4/12 Primary

  from hydrocarbons containing a six-membered aromatic ring, e.g. propyltoluene to vinyltoluene · CPC title