Processes for upgrading alkanes and alkyl aromatic hydrocarbons

Patent metadata

Field	Value
Publication number	US-11760703-B2
Application number	US-202217744890-A
Country	US
Kind code	B2
Filing date	May 16, 2022
Priority date	Mar 6, 2020
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

Processes for upgrading a hydrocarbon. The process can include contacting a hydrocarbon-containing feed with fluidized catalyst particles that can include a Group 8-10 element or a compound thereof disposed on a support to effect one or more of dehydrogenation, dehydroaromatization, and dehydrocyclization of at least a portion of the hydrocarbon-containing feed to produce coked catalyst particles and an effluent. The process can also include contacting at least a portion of the coked catalyst particles with an oxidant to effect combustion of at least a portion of the coke to produce regenerated catalyst particles. The process can also include contacting at least a portion of the regenerated catalyst particles with a reducing gas to produce regenerated and reduced catalyst particles. The process can also include contacting an additional quantity of the hydrocarbon-containing feed with fluidized regenerated and reduced catalyst particles to produce additional effluent and re-coked catalyst particles.

First claim

What is claimed is:

1. A process for upgrading a hydrocarbon, comprising:
(I) contacting a hydrocarbon-containing feed with fluidized catalyst particles comprising a Group 8-10 element disposed on a support within a conversion zone to effect one or more of dehydrogenation, dehydroaromatization, and dehydrocyclization of at least a portion of the hydrocarbon-containing feed to produce a conversion effluent comprising fluidized coked catalyst particles, one or more upgraded hydrocarbons, and molecular hydrogen, wherein:
the hydrocarbon-containing feed comprises one or more of C 2 -C 16 linear or branched alkanes, one or more of C 4 -C 16 cyclic alkanes, one or more of C 8 -C 16 alkyl aromatic hydrocarbons, or a mixture thereof;
the hydrocarbon-containing feed and fluidized catalyst particles are contacted at a temperature in a range from 300° C. to 900° C., for a time period in a range from 0.1 seconds to 2 minutes, under a hydrocarbon partial pressure of at least 20 kPa-absolute, wherein the hydrocarbon partial pressure is the total partial pressure of any C 2 -C 16 linear or branched alkanes, any C 4 -C 16 cyclic alkanes, and any C 8 -C 16 alkyl aromatic hydrocarbons in the hydrocarbon-containing feed;
the hydrocarbon-containing feed and the fluidized catalyst particles are contacted with one another in a presence of steam at an amount in a range from 0.1 vol % to 50 vol %, based on a total volume of any C 2 -C 16 linear or branched alkanes, any C 4 -C 16 cyclic alkanes, and any C 8 -C 16 alkyl aromatic hydrocarbons in the hydrocarbon-containing feed;
the fluidized catalyst particles comprise from 0.001 wt % to 6 wt % of the Group 8-10 element based on the weight of the support; and
the one or more upgraded hydrocarbons comprise a dehydrogenated hydrocarbon, a dehydroaromatized hydrocarbon, a dehydrocylized hydrocarbon, or a mixture thereof;

(II) obtaining from the conversion effluent a first gaseous stream rich in the one or more upgraded hydrocarbons and the molecular hydrogen and a first particle stream rich in the fluidized coked catalyst particles;
(III) contacting at least a portion of the fluidized coked catalyst particles in the first particle stream with an oxidant in a combustion zone to effect combustion of at least a portion of the coke to produce a combustion effluent comprising fluidized regenerated catalyst particles lean in coke and a combustion gas;
(IV) obtaining from the combustion effluent a second gaseous stream rich in the combustion gas and a second particle stream rich in the fluidized regenerated catalyst particles;
(IVa) contacting at least a portion of the fluidized regenerated catalyst particles with a reducing gas for a time period in a range from 1 second to less than 30 minutes to produce fluidized regenerated and reduced catalyst particles; and
(V) contacting an additional quantity of the hydrocarbon-containing feed with the fluidized regenerated and reduced catalyst particles to produce additional conversion effluent comprising fluidized re-coked catalyst particles, additional one or more upgraded hydrocarbons, and additional molecular hydrogen, wherein a cycle time from the contacting the hydrocarbon-containing feed with the fluidized catalyst particles in step (I) to the contacting the additional quantity of the hydrocarbon-containing feed with the fluidized regenerated and reduced catalyst particles in step (V) is ≤60 minutes.

2. The process of claim 1 , wherein, in step (IVa), the fluidized regenerated catalyst particles and reducing gas are contacted at a temperature in a range from 700° C. to 900° C.

3. The process of claim 1 , wherein the cycle time is in an range from 1 minute to 45 minutes.

4. The process of claim 1 , wherein the support comprises a mixed Mg/Al metal oxide, and wherein in step (I), the hydrocarbon-containing feed and the fluidized catalyst particles are contacted with one another in the presence of steam at an amount in a range from 0.1 vol % to 30 vol %, based on a total volume of any C 2 -C 16 alkanes and any C 8 -C 16 alkyl aromatic hydrocarbons in the hydrocarbon-containing feed.

5. The process of claim 1 , wherein the support comprises a mixed Mg/Al metal oxide, and wherein in step (I), the hydrocarbon-containing feed and the fluidized catalyst particles are contacted with one another in the presence of steam at an amount in a range from 0.1 vol % to 15 vol %, based on a total volume of any C 2 -C 16 linear or branched alkanes, any C 4 -C 16 cyclic alkanes, and any C 8 -C 16 alkyl aromatic hydrocarbons in the hydrocarbon-containing feed.

6. The process of claim 1 , wherein the hydrocarbon-containing feed comprises ≥80 vol % of propane, based on a total volume of the hydrocarbon-containing feed, wherein the hydrocarbon-containing feed and the fluidized catalyst particles are contacted under a propane partial pressure of at least 100 kPa-absolute, and wherein contacting the hydrocarbon-containing feed with the fluidized catalyst particles in step (I) has a propylene yield of at least 48% at a propylene selectivity of ≥75%.

7. The process of claim 1 , wherein in step (I), at least one of the following is met:
(i) the hydrocarbon-containing feed and the fluidized catalyst particles are contacted at a temperature in a range from 550° C. to 900° C.; and
(ii) the hydrocarbon-containing feed and the fluidized catalyst particles are contacted under a hydrocarbon partial pressure in a range from 20 kPa-absolute to 1,000 kPa-absolute.

8. The process of claim 1 , wherein in step (III), the fluidized coked catalyst particles and oxidant are contacted at a temperature in a range from 700° C. to 1,100° C.

9. The process of claim 1 , wherein the fluidized catalyst particles further comprise a promoter, and wherein the promoter comprises Sn, Ga, Zn, Ge, In, Re, Ag, Au, Cu, a combination thereof, or a mixture thereof.

10. The process of claim 1 , wherein the fluidized catalyst particles further comprise an alkali metal element selected from Li, Na, K, Rb, Cs, and combinations and mixtures thereof disposed on the support, and wherein the fluidized catalyst particles comprise up to 5 wt % of the alkali metal element based on the weight of the support.

11. The process of claim 1 , wherein the fluidized catalyst particles are in the form of a dense turbulent fluidized bed when contacted with the hydrocarbon-containing feed.

12. The process of claim 1 , wherein the conversion zone is disposed within a riser reactor or a down reactor.

13. The process of claim 1 , wherein a first portion of the fluidized coked catalyst particles in the first particle stream rich in the fluidized coked catalyst particles is contacted with the oxidant in the combustion zone in step (II), and wherein a second portion of the fluidized coked catalyst particles in the first particle stream rich in the fluidized coked catalyst particles is contacted with the additional quantity of the hydrocarbon-containing feed in step (V).

14. The process of claim 1 , further comprising:
removing a portion of the fluidized catalyst particles from the conversion zone during contact of the hydrocarbon-containing feed with the fluidized catalyst particles during step (I);
heating the portion of the fluidized catalyst particles removed from the conversion zone to produce heated fluidized catalyst particles, wherein the portion of the fluidized catalyst particles is heated by (i) indirectly transferring heat from a heat transfer medium or (ii) an electric heater; and
feeding the heated fluidized catalyst particles into the conversion zone to contact the hydrocarbon-containing feed.

15. The process of c

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Bao Xiaoying
• Coleman John S

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/31

  Density · CPC title

• B01J38/30 Primary

  in gaseous suspension, e.g. fluidised bed · CPC title

• C07C5/3337 Primary

  of the platinum group · CPC title

• Y02P20/52

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