Process for converting paraffin to olefin and catalyst for use therein

Patent metadata

Field	Value
Publication number	US-10329219-B2
Application number	US-201414782457-A
Country	US
Kind code	B2
Filing date	Mar 28, 2014
Priority date	Apr 3, 2013
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

The invention relates to a process for converting paraffin to olefin comprising the following steps: (a) providing a hydrocarbon feedstock containing at least one paraffin having 1 to 12 carbon atoms and at least one olefin having 2 to 12 carbon atoms; (b) providing a catalyst containing at least one Group VIA and/or Group VIIA transition metal on a solid support; (c) pretreating the catalyst by contacting the catalyst with at least one reducing gas and at least one oxidizing gas; and (d) contacting the by hydrocarbon feedstock and the pretreated catalyst at a temperature in the range of 200° C. to 600° C., preferably 320° C. to 450° C. and to a catalyst for use therein.

First claim

The invention claimed is:

1. A process for converting paraffin to olefin comprising the following steps:
(a) providing a hydrocarbon feedstock containing at least one paraffin having 1 to 12 carbon atoms and at least one olefin having 2 to 12 carbon atoms;
(b) providing a catalyst containing a single metal on a solid support, wherein the single metal is a Group VIA transition metal;
(c) pretreating the catalyst by contacting the catalyst with at least one reducing gas and at least one oxidizing gas; and
(d) contacting the hydrocarbon feedstock with the pretreated catalyst at a temperature in the range of 200° C. to 600° C. to thereby form ethylene and propylene with a selectivity for ethylene and propylene of at least 88 wt %.

2. The process according to claim 1 , wherein the at least one paraffin is methane, ethane, propane, n-butane, i-butane, n-pentane, i-pentane or mixtures thereof.

3. The process according to claim 1 , wherein the at least one olefin is ethylene, propylene, 1-butene, cis-2-butene, trans-2-butene, n-pentene or mixtures thereof.

4. The process according to claim 1 , wherein the weight ratio of paraffins to olefins in the hydrocarbon feedstock is in the range of 0.1:1 to 100:1.

5. The process according to claim 1 , wherein the Group VIA transition metal is molybdenum or tungsten.

6. The process according to claim 1 , wherein the catalyst comprises 1 to 15 percent by weight of the Group VIA transition metal based on total weight of the catalyst.

7. The process according to claim 1 , wherein the solid support is silicon dioxide, aluminum oxide, activated carbon, magnesium oxide, titanium dioxide, lanthanum oxide, zirconium dioxide, zeolite, layered double hydroxides or any combination thereof.

8. The process according to claim 1 , wherein pretreating the catalyst comprises contacting the catalyst with the at least one reducing gas at a temperature in the range of 200° C. to 700° C.

9. The process according to claim 8 , wherein the reducing gas is hydrogen.

10. The process according to claim 8 , wherein the contacting the catalyst with the at least one reducing gas is done with a WHSV in the range of 0.0001 hr −1 to 100 hr −1 for a period of 5 minutes to 30 hours.

11. The process according to claim 1 , wherein pretreating the catalyst comprises contacting the catalyst with the at least one oxidizing gas at a temperature in the range of 200° C. to 700° C.

12. The process according to claim 11 , wherein the oxidizing gas is air.

13. The process according to claim 11 , wherein the contacting the catalyst with the at least one oxidizing gas is done with a WHSV in the range of 0.0001 hr −1 to 100 hr −1 for a period of 5 minutes to 30 hours.

14. The process according to claim 1 , wherein the pretreated catalyst comprises a mixture of at least one transition metal hydride and at least one transition metal oxide.

15. The process according to claim 1 , wherein contacting the hydrocarbon feedstock with the pretreated catalyst in step (d) is carried out at a pressure in the range of 1 bar to 60 bar.

16. The process according to claim 1 , wherein contacting the hydrocarbon feedstock and the pretreated catalyst in step (d) is carried out at a WHSV in the range of 0.01 hr −1 to 200 hr −1 .

17. The process according to claim 1 , wherein the process further comprises a regeneration step (e).

18. The process according to claim 17 , wherein the regeneration step (e) comprises contacting the catalyst with at least one oxidizing gas at a temperature in the range of 200° C. to 700° C.

19. The process according to claim 1 , wherein the selectivity for ethylene and propylene ranges from 88 wt % to 97 wt %.

Assignees

• Scg Chemicals Co Ltd

Inventors

• Suriye Kongkiat
• Jareewatchara Wuttithep
• Lekngam Pruphanya
• Nonkhamwong Anuwat
• Sutthiumporn Kesada

Classifications

• B01J23/30

  Tungsten · CPC title

• C07C5/3335 Primary

  with metals · CPC title

• C07C2529/70

  of types characterised by their specific structure not provided for in groups C07C2529/08 - C07C2529/65 · CPC title

• C07C2529/40

  of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11 · CPC title

• B01J21/10

  Magnesium; Oxides or hydroxides thereof · CPC title