Process for converting paraffin to olefin and catalyst for use therein

Patent metadata

Field	Value
Publication number	US-2017190639-A9
Application number	US-201414782457-A
Country	US
Kind code	A9
Filing date	Mar 28, 2014
Priority date	Apr 3, 2013
Publication date	Jul 6, 2017
Grant date	—

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

1 - 14 . (canceled)

15 . 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 with the pretreated catalyst at a temperature in the range of 200° C. to 600° C.

16 . The process according to claim 15 wherein the at least one paraffin is methane, ethane, propane, n-butane, i-butane, n-pentane, i-pentane or mixtures thereof.

17 . The process according to claim 15 wherein the at least one olefin is ethylene, propylene, 1-butene, cis-2-butene, trans-2-butene, n-pentene or mixtures thereof.

18 . The process according to claim 15 wherein the weight ratio of paraffins to olefins in the hydrocarbon feedstock is in the range of 0.1:1 to 100:1.

19 . The process according to claim 15 wherein the at least one Group VIA or Group VIIA transition metal is molybdenum, tungsten, rhenium or mixtures thereof.

20 . The process according to claim 15 wherein the catalyst comprises 1 to 15 percent by weight of the at least one Group VIA or Group VIIA transition metal based on total weight of the catalyst.

21 . The process according to claim 15 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.

22 . The process according to claim 15 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.

23 . The process according to claim 22 , wherein the reducing gas is hydrogen.

24 . The process according to claim 22 wherein the pretreating 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.

25 . The process according to claim 15 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.

26 . The process according to claim 25 wherein the oxidizing gas is air.

27 . The process according to claim 25 wherein the pretreating 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.

28 . The process according to claim 15 wherein the pretreated catalyst comprises a mixture of at least one transition metal hydride and at least one transition metal oxide.

29 . The process according to claim 15 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.

30 . The process according to claim 15 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 .

31 . The process according to claim 15 wherein the process further comprises a regeneration step (e).

32 . The process according to claim 15 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.

33 . A catalyst containing at least one Group VIA and/or Group VIIA transition metal on a solid support.

34 . The catalyst according to claim 33 wherein the at least one Group VIA and/or Group VIIA transition metal is molybdenum, tungsten, rhenium, or mixtures thereof.

35 . The catalyst according to claim 33 wherein the catalyst comprises 1 to 15 percent by weight of the at least one Group VIA and/or Group VIIA transition metal, based on total weight of the catalyst.

36 . The catalyst according to claim 35 wherein the catalyst comprises 5 to 10 percent by weight of the at least one Group VIA and/or Group VIA transition metal, based on total weight of the catalyst.

37 . The catalyst according to claim 33 wherein the solid support is silicon dioxide, aluminum oxide, activated carbon, magnesium oxide, titanium dioxide, lanthanum oxide, zirconium dioxide, zeolite, layered double hydroxide or any combination thereof.

38 . The catalyst according to claim 32 wherein the solid support is a combination of silicon dioxide and zeolite.

39 . The catalyst according to claim 33 wherein 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.

40 . The catalyst according to claim 37 wherein the zeolite is ZSM-5, X-zeolite, Y-zeolite, beta-zeolite, MCM-22, ferrierrite, chabazite, or mixtures thereof.

41 . The catalyst according to any of claim 33 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.

Assignees

• Scg Chemicals Co Ltd

Inventors

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

Classifications

• C07C2521/02

  Boron or aluminium; Oxides or hydroxides thereof · CPC title

• B01J23/92

  of catalysts comprising metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 · CPC title

• C07C2521/18

  Carbon · CPC title

• B01J29/084

  Y-type faujasite · CPC title

• B01J38/02

  Heat treatment · CPC title