Catalysts and methods for producing propylene from ethylene and butene

Patent metadata

Field	Value
Publication number	US-10029960-B2
Application number	US-201715414384-A
Country	US
Kind code	B2
Filing date	Jan 24, 2017
Priority date	Jan 29, 2016
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

The present disclosure relates to chemical catalysts and methods that may be used for the production and/or interconversion of olefins. In some embodiments, methods for producing propylene from ethylene and butene comprising, (a) obtaining a catalyst composition comprising an isomerization catalyst and a disproportionation catalyst, wherein the weight ratio of the isomerization catalyst to the disproportionation catalyst is from 10:1 to 1:10; and (b) reacting butene with ethylene at a temperature from about 500° F. (260° C.) to about 650° F. (350° C.) in the presence of the catalyst composition under conditions sufficient to produce propylene are provided.

First claim

What is claimed is:

1. A method for producing propylene comprising:
(a) obtaining a catalyst composition comprising an isomerization catalyst comprising MgO and a disproportionation catalyst comprising a transition metal oxide deposited on a solid support, wherein the weight ratio of the isomerization catalyst to the disproportionation catalyst is from 10:1 to 1:10; and
(b) reacting butene with ethylene at a temperature from about 500° F. (260° C.) to about 650° F. (350° C.) in the presence of the catalyst composition under conditions sufficient to produce propylene;
wherein the temperature is optionally decreased for increasing propylene production and reducing catalyst compositional decay.

2. The method of claim 1 , wherein the ethylene and the butene are reacted at a temperature from about 500° F. (260° C.) to about 550° F. (288° C.).

3. The method of claim 1 , wherein the weight ratio of the isomerization catalyst to the disproportionation catalyst is from about 4:1 to about 1:4.

4. The method of claim 1 , wherein the weight ratio of the isomerization catalyst to the disproportionation catalyst is about 1:1.

5. The method of claim 1 , wherein the isomerization catalyst is a zeolite, alumina, or a basic metal oxide selected from the group consisting of an alkali metal oxide, an alkaline earth metal oxide and a rare earth metal oxide.

6. The method of claim 1 , wherein the transition metal oxide is an oxide of molybdenum, tungsten, cobalt, ruthenium, rhenium or a mixture thereof.

7. The method of claim 6 , wherein the transition metal oxide is WO 3 .

8. The method of claim 1 , wherein the solid support is silica.

9. The method of claim 1 , wherein the ethylene and the butene are reacted at a pressure from about 5 psig (0.14 MPa) to about 600 psig (4.24 MPa).

10. The method of claim 1 , wherein the mole ratio of ethylene to butene is from about 0.5:1 to about 5:1.

11. The method of claim 1 , wherein the weight hourly space velocity of the reaction is from about 1 hr −1 to 100 hr −1 .

12. The method of claim 1 , wherein the method results in:
(a) a butene conversion percentage of greater than 55% relative to the amount of butene;
(b) a propylene selectivity percentage of greater than 85% relative to the total reaction products; or
(c) a propylene yield of greater than 50% based on the amount of butene.

Assignees

• Lyondell Chemical Tech Lp

Inventors

• Zhang Lei
• White Daniel F

Classifications

• C07C5/2512

  with metal oxides · CPC title

• B01J23/30

  Tungsten · CPC title

• C07C6/04 Primary

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

• C07C2523/30

  Tungsten · CPC title

• C07C2521/08

  Silica · CPC title