Olefin double bond isomerization catalyst with high poison resistance

Patent metadata

Field	Value
Publication number	US-10815167-B2
Application number	US-201815985242-A
Country	US
Kind code	B2
Filing date	May 21, 2018
Priority date	Nov 20, 2013
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

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-titanic 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 catalyst useful for the double-bond isomerization of olefins, in the presence of oxygenates, comprising a γ-alumina-titania mixture having:
a surface area of greater than 200 m 2 /g;
from 0.01 wt % to 40 wt % titania;
wherein the catalyst is resistant to poisoning by oxygenates at oxygenate concentrations in the range from about 100 ppm to about 1000 ppm.

2. The catalyst of claim 1 , wherein the catalyst exhibits an increase in isomerization activity in the presence of methanol.

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

4. The catalyst of claim 1 , wherein the catalyst has a surface area greater than 350 m 2 /g.

5. A system for the production of olefins in the presence of oxygenates, the system comprising:
an inlet for receiving an olefin-containing hydrocarbon feed;
a reaction zone comprising at least one bed of catalyst, the at least one bed of catalyst containing a γ-alumina-titania catalyst, the catalyst having:
a surface area of greater than 200 m 2 /g;
from 0.01 wt % to 40 wt % titania;
activity for the double bond isomerization of the olefin to form an isomerized olefin product; and
wherein the catalyst is resistant to poisoning by oxygenates at oxygenate concentrations in the range from 100 ppm to 1000 ppm;

an outlet for recovering an effluent comprising the isomerized olefin product.

6. The system of claim 5 , wherein the catalyst also has activity for the dehydration of alcohols to form olefins.

7. The system of claim 5 , wherein the catalyst exhibits an increase in isomerization activity in the presence of methanol.

8. The system of claim 5 , the reaction zone further comprising at least one catalyst bed containing a basic metal oxide isomerization catalyst located downstream of the at least one bed of catalyst containing the γ-alumina-titania catalyst.

9. The system of claim 5 , the reaction zone further comprising a metathesis catalyst.

10. The system of claim 9 , wherein the metathesis catalyst is contained in a bed downstream of the at least one bed of catalyst containing the γ-alumina-titania catalyst.

11. The system of claim 9 , wherein the metathesis catalyst is admixed with the γ-alumina-titania catalyst or is admixed with a basic metal oxide isomerization catalyst.

12. A system for the production of olefins in the presence of oxygenates, the system comprising:
one or more inlets for receiving an olefin and a C2-C6 alcohol;
a reaction zone comprising at least one bed of catalyst, the at least one bed containing a γ-alumina-titania catalyst, the catalyst having:
a surface area of greater than 200 m 2 /g;
from 0.01 wt % to 40 wt % titania;
activity for the dehydration of the C2-C6 alcohols to form additional olefins;
activity for the double bond isomerization of the olefins, provided in the feed or formed in situ from the dehydration of the C2-C6 alcohols, to form an isomerized olefin product; and
wherein the catalyst is resistant to poisoning by oxygenates at oxygenate concentrations in the range from 100 ppm to 1000 ppm;

an outlet for recovering an effluent comprising the isomerized olefin product.

13. The system of claim 12 , wherein the catalyst exhibits an increase in isomerization activity in the presence of methanol.

14. The system of claim 12 , the reaction zone further comprising at least one catalyst bed containing a basic metal oxide isomerization catalyst located downstream of the at least one bed containing the γ-alumina-titania catalyst.

15. The system of claim 12 , the reaction zone further comprising a metathesis catalyst.

16. The system of claim 15 , wherein the metathesis catalyst is contained in a bed downstream of the bed containing the γ-alumina-titania catalyst.

17. The system of claim 15 , wherein the metathesis catalyst is admixed with the γ-alumina-titania catalyst or is admixed with a basic metal oxide isomerization catalyst.

Assignees

• Lummus Technology Inc

Inventors

• Ramachandran Bala
• Choi Sukwon
• Gartside Robert J

Classifications

• C07C2521/06

  Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• C07C2521/04

  Alumina · CPC title

• C07C6/04

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

• C07C5/2512 Primary

  with metal oxides · CPC title

• C07C1/24

  by elimination of water · CPC title