Methods of producing propylene and ethylene

Patent metadata

Field	Value
Publication number	US-10513472-B2
Application number	US-201816165603-A
Country	US
Kind code	B2
Filing date	Oct 19, 2018
Priority date	Oct 26, 2017
Publication date	Dec 24, 2019
Grant date	Dec 24, 2019

Abstract

Methods of producing at least one of ethylene and propylene. The methods may include contacting a mixture of C4+ compounds with a catalyst to convert at least a portion of the C4+ compounds to at least one of ethylene and propylene. The catalyst can include a phosphorus treated zeolite, and the mixture of C4+ compounds can include at least one of t-butyl alcohol and methyl t-butyl ether.

First claim

What is claimed is:

1. A method of producing at least one of ethylene and propylene, the method comprising:
providing a first mixture of C4+ compounds; and
contacting the first mixture of C4+ compounds with a catalyst comprising:
(a) a phosphorus treated zeolite, wherein the phosphorus treated zeolite comprises an alkali metal, and wherein the alkali metal is present in an amount no greater than about 0.5% by weight of the phosphorus treated zeolite, and
(b) a binder, wherein the binder comprises bentonite clay, silica and kaolin and wherein the bentonite clay, silica and kaolin are present in the binder in a bentonite clay:silica:kaolin weight ratio of about 1:8-16:20,

to convert at least a portion of the first mixture of C4+ compounds to at least one of ethylene and propylene, thereby producing a first effluent comprising at least one of ethylene and propylene
wherein the first mixture of C4+ compounds comprises at least one of t-butyl alcohol and methyl t-butyl ether.

2. The method of claim 1 , further comprising separating the ethylene and/or the propylene from the first effluent to form a second mixture of C4+ compounds, and contacting the second mixture of C4+ compounds with the catalyst to convert at least a portion of the second mixture of C4+ compounds to at least one of ethylene and propylene.

3. The method of claim 1 wherein the first mixture of C4+ compounds comprises the t-butyl alcohol, and at least 20 weight % of the t-butyl alcohol is converted to at least one of ethylene and propylene.

4. The method of claim 3 , wherein at least 22 weight % of the t-butyl alcohol is converted to propylene.

5. The method of claim 1 wherein the first mixture of C4+ compounds comprises the methyl t-butyl ether, and at least 20 weight % of the methyl t-butyl ether is converted to at least one of ethylene and propylene.

6. The method of claim 5 , wherein at least 22 weight % of the methyl t-butyl ether is converted to propylene.

7. The method of claim 1 wherein the phosphorus treated zeolite comprises a ZSM-5 zeolite.

8. The method of claim 7 , wherein the ZSM-5 zeolite has an alkali metal content of about 0.5% by weight of the ZSM-5 zeolite.

9. The method of claim 1 wherein the phosphorus treated zeolite comprises phosphorus in an amount of about 0.1% to about 10% by weight of the phosphorus treated zeolite.

10. The method of claim 1 wherein the phosphorus treated zeolite comprises phosphorus in an amount of about 1% to about 3% by weight of the phosphorus treated zeolite.

11. The method of claim 1 , wherein the binder further comprises calcium, alumina, silica aluminate, or a combination thereof.

12. The method of claim 1 wherein the contacting occurs at ambient pressure.

13. The method of claim 1 wherein the contacting occurs at a pressure of about 1 psig to about 20 psig.

14. The method of claim 1 wherein the contacting occurs at a temperature of about 600° F. to about 1,200° F.

15. The method of claim 1 further comprising steaming the catalyst prior to contacting the first mixture of C4+ compounds with the catalyst.

16. The method of claim 15 , wherein the steaming is performed at a temperature of about 800° F. to about 1200° F.

17. The method of claim 2 , wherein the first mixture of C4+ compounds and/or the second mixture of C4+ compounds is diluted with steam.

18. The method of claim 17 , wherein the first mixture of C4+ compounds and/or the second mixture of C4+ compounds is diluted with about 20 to about 35% by weight of steam, based on the weight of the first mixture of C4+ compounds and/or the second mixture of C4+ compounds, respectively.

Assignees

• Lyondell Chemical Tech Lp

Inventors

• Leyshon David W

Classifications

• B01J29/85

  Silicoaluminophosphates [SAPO compounds] · CPC title

• C07C1/22 Primary

  by reduction · CPC title

• B01J21/16

  Clays or other mineral silicates · CPC title

• C07C2529/82

  Phosphates · CPC title

• C07C2521/08

  Silica · CPC title