Process for converting paraffin to olefin and catalyst for use therein

Patent metadata

Field	Value
Publication number	US-10329220-B2
Application number	US-201715616975-A
Country	US
Kind code	B2
Filing date	Jun 8, 2017
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 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 catalyst containing a single metal on a solid support; wherein the single metal is a Group VIA transition metal and the solid support is a combination of silicon dioxide and 0.1 to 60 percent by weight of zeolite, based on total weight of the solid support; further wherein the catalyst does not contain a layered double hydroxide.

2. The catalyst according to claim 1 , wherein the single Group VIA transition metal is molybdenum or tungsten.

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

4. The catalyst according to claim 3 , wherein the catalyst comprises 5 to 10 percent by weight of the single Group VIA transition metal, based on total weight of the catalyst.

5. The catalyst according to claim 1 , wherein the zeolite is ZSM-5, X-zeolite, Y-zeolite, beta-zeolite, MCM-22, ferrierrite, chabazite, or mixtures thereof.

6. The catalyst according to claim 1 , wherein the catalyst comprises 8 percent by weight of tungsten on a solid support comprising 5 percent by weight of HY-zeolite and 95 percent by weight of silicon dioxide.

7. A mixture comprising the catalyst according to claim 1 and a co-catalyst.

8. The mixture according to claim 7 , wherein the co-catalyst is an isomerization catalyst.

9. The mixture according to claim 8 , wherein the isomerization catalyst is selected from a group consisting of magnesium oxide, calcium oxide, yttrium oxide, zinc oxide, hydrotalcite, and a solid solution of aluminum oxide and magnesium oxide.

10. The catalyst according to claim 1 , wherein the catalyst is prepared by contacting the solid support with an impregnation solution of a transition metal compound, wherein a transition metal of the transition metal compound is the single Group VIA transition metal.

11. The catalyst according to claim 10 , wherein the impregnation solution includes the transition metal compound with the single Group VIA transition metal in at least one solvent.

12. The catalyst according to claim 11 , wherein the transition metal compound is selected from the group consisting of nitrate, sulfate, and carbonate.

13. The catalyst according to claim 11 , wherein the transition metal compound is ammonium metatungsten tetrahydrate.

14. The catalyst according to claim 11 , wherein the at least one solvent is an oxygenated solvent or a hydrocarbon solvent.

15. The catalyst according to claim 11 , wherein the at least one solvent is selected from the group consisting of water, methanol, ethanol, and hexane.

16. The catalyst according to claim 10 , wherein the solid support is dried and calcined following impregnation.

17. The catalyst according to claim 1 , wherein the catalyst is prepared by incipient wetness.

18. The catalyst according to claim 1 , wherein the catalyst is prepared by ion exchange.

19. The catalyst according to claim 1 , wherein the catalyst is regenerated by oxidative burning.

20. The catalyst according to claim 19 , wherein the oxidative burning comprises contacting the catalyst with at least one oxidizing gas at a temperature ranging from 200° C. to 700° C.

Assignees

• Scg Chemicals Co Ltd

Inventors

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

Classifications

• B01J29/90

  Regeneration or reactivation · CPC title

• C07C2521/18

  Carbon · CPC title

• C07C6/04

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

• C07C5/3332

  with metal oxides or metal sulfides · CPC title

• C07C2523/36

  Rhenium · CPC title