Olefin double bond isomerization catalyst with high poison resistance

Patent metadata

Field	Value
Publication number	US-9975819-B2
Application number	US-201414548460-A
Country	US
Kind code	B2
Filing date	Nov 20, 2014
Priority date	Nov 20, 2013
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

A process for the double-bond isomerization of olefins is disclosed. The process may include contacting a hydrocarbon stream including olefins with a γ-alumina-titania isomerization catalyst to convert at least a portion of the olefin to its positional isomer. The γ-alumina-titania isomerization catalysts disclosed herein may also have the activity to convert alcohol into additional olefins, while having increased resistance to oxygenate poisons.

First claim

What is claimed:

1. A process for the double bond isomerization of olefins, the process comprising:
contacting in a reaction zone at least one olefin-containing feed with a catalyst having activity for the double bond isomerization of the olefin to form an isomerized olefin product,
wherein the catalyst comprises a γ-alumina-titania catalyst having a surface area of greater than 200 m 2 /g,
wherein the contacting is performed in the presence of oxygenates in the olefin-containing feed, oxygenates formed in-situ, or both, and said oxygenates are present in a concentration in the range from 100 ppm to 1000 ppm; and
wherein the catalyst is resistant to poisoning by oxygenates in the olefin-containing feed at concentrations from 100 ppm to 1000 ppm.

2. The process of claim 1 , wherein the catalyst comprises from about 0.01 wt % to about 50 wt % titania.

3. The process of claim 1 , wherein the catalyst comprises from about 10 wt % to about 40 wt % titania.

4. The process of claim 1 , wherein the catalyst also has activity for the dehydration of alcohols to form olefins.

5. The process of claim 1 , wherein the reaction zone is maintained at a temperature in the range from about 5° C. to about 500° C., and at a pressure is in the range from atmospheric pressure to about 2000 psig, and optionally under an inert atmosphere.

6. The process of claim 1 , wherein the reaction zone comprises a first bed containing the γ-alumina-titania catalyst and a second bed containing a basic metal oxide isomerization catalyst.

7. The process of claim 1 , further comprising contacting the isomerized olefin product with a metathesis catalyst to convert the isomerized olefin product to a metathesized olefin product.

8. The process of claim 7 , wherein the metathesis catalyst is disposed in a downstream reactor.

9. The process of claim 1 , wherein activity of the catalyst increases in the presence of methanol.

10. A process for the double bond isomerization of olefins, the process comprising:
contacting in a reaction zone at least one olefin-containing feed with a catalyst having activity for the double bond isomerization of the olefin to form an isomerized olefin product,
wherein the catalyst comprises a γ-alumina-titania catalyst having a surface area of greater than 350 m 2 /g, and
wherein the contacting is performed in the presence of oxygenates in the olefin-containing feed, oxygenates formed in-situ, or both, and said oxygenates are present in a concentration in the range from 100 ppm to 1000 ppm.

11. The process of claim 10 , wherein the catalyst comprises from about 10 wt % to about 40 wt % titanic.

12. The process of claim 10 , wherein the catalyst also has activity for the dehydration of alcohols to form olefins.

13. The process of claim 10 , wherein the reaction zone is maintained at a temperature in the range from about 5° C. to about 500° C., and at a pressure is in the range from atmospheric pressure to about 2000 prig, and optionally under an inert atmosphere.

14. The process of claim 10 , wherein the reaction zone comprises a first bed containing the γ-alumina-titania catalyst and a second bed containing a basic metal oxide isomerization catalyst.

15. The process of claim 10 , further comprising contacting the isomerized olefin product with a metathesis catalyst to convert the isomerized olefin product to a metathesized olefin product.

16. A process for the double bond isomerization of olefins, the process comprising:
contacting in a reaction zone at least one olefin-containing feed with a catalyst having activity for the double bond isomerization of the olefin to form an isomerized olefin product,
wherein the catalyst comprises a γ-alumina-titania catalyst having a surface area of greater than 350 m 2 /g and from 10 wt % to 40 wt % titanic, and
wherein the contacting is performed in the presence of oxygenates in the olefin-containing feed, oxygenates formed in-situ, or both, and said oxygenates are present in a concentration in the range from 100 ppm to 1000 ppm.

17. The process of claim 16 , wherein the catalyst also has activity for the dehydration of alcohols to form olefins.

18. The process of claim 16 , wherein the reaction zone comprises a first bed containing the γ-alumina-titania catalyst and a second bed containing a basic metal oxide isomerization catalyst.

19. The process of claim 16 , further comprising contacting the isomerized olefin product with a metathesis catalyst to convert the isomerized olefin product to a metathesized olefin product.

20. The process of claim 19 , wherein the metathesis catalyst is disposed in a downstream reactor.

Assignees

• Lummus Technology Inc

Inventors

• Ramachandran Bala
• Choi Sukwon
• Gartside Robert J

Classifications

• Y02P20/52

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

• C07C1/24

  by elimination of water · CPC title

• C07C6/04

  at a carbon-to-carbon double bond · CPC title

• C07C2521/04

  Alumina · CPC title

• C07C5/2512 Primary

  with metal oxides · CPC title