Dehydrogenation of alkanes to alkenes

Patent metadata

Field	Value
Publication number	US-2017247302-A1
Application number	US-201515507985-A
Country	US
Kind code	A1
Filing date	Sep 23, 2015
Priority date	Sep 29, 2014
Publication date	Aug 31, 2017
Grant date	—

Abstract

Process for dehydrogenation of alkanesor alkylbenzenes by using metal sulfide catalyst under the presence of small amounts of hydrogen sulfide.

First claim

1 . Process for the dehydrogenation of alkanes, alkenes or alkylbenzenes to the corresponding unsaturated chemical products and hydrogen (H 2 ) comprising contacting the alkane, alkene or alkylbenzene with a metallic sulfide (MeS) catalyst in which the dehydrogenation is conducted in one or more dehydrogenation reactors without using steam (H 2 O) as carrier gas for the alkanes, alkenes or alkylbenzenes, and in the presence of hydrogen sulfide (H 2 S) without formation of H 2 S as a reaction product.

2 . Process according to claim 1 in which the molar ratio of hydrogen sulfide to alkanes, alkenes or alkylbenzene is between 0.01 and 0.2.

3 . Process according to claim 1 in which the molar ratio of hydrogen sulfide (H 2 S) to hydrogen (H 2 ) is between 0.01 and 0.2.

4 . Process according to claim 3 in which the molar ratio of hydrogen sulfide (H 2 S) to hydrogen (H 2 ) is 0.05-0.06.

5 . Process according to claim 1 , in which the metal (Me) of the metallic sulfide (MeS) is selected from Fe, Co, Ni, Mn, Cu, Mo, W and combinations thereof.

6 . Process according to claim 1 , in which the process is conducted at temperatures in the range 500-700° C.

7 . Process according to claim 1 , in which the alkane is selected from ethane, propane, butane, pentane and combinations thereof.

8 . Process according to claim 1 , wherein the alkene is selected from ethylene, propylene, butene, pentene and combinations thereof.

9 . Process according to claim 1 , in which the alkylbenzene is ethylbenzene and the corresponding unsaturated chemical product is styrene.

10 . Process according to claim 1 , in which unreacted alkanes, alkenes, alkylbenzenes and by-products are recycled to the one or more dehydrogenation reactors.

11 . Process according to claim 10 in which the unreacted alkanes, alkylbenzenes and by-products include methane, ethane, ethylbenzenes, benzene, toluene, and combinations thereof.

12 . Process according to claim 1 , in which benzene, toluene, or combinations of both, are used as carrier gas.

13 . Process according to claim 1 , in which methane, ethane, or combinations of both, are used as carrier gas.

14 . Process according to claim 1 , in which the dehydrogenation is conducted in adiabatic reactors with a reheating step and selective oxidation of hydrogen produced in the process in between the reactors.

15 . Process according to claim 1 , in which off-gas containing H 2 and CH 4 produced in the process is used as carrier gas and selective oxidation of hydrogen is conducted upstream the first dehydrogenation reactor.

Assignees

• Haldor Topsoe As

Inventors

• Højlund Nielsen Poul Erik
• Hansen John Bøgild

Classifications

• C07C2527/047

  with chromium, molybdenum, tungsten or polonium · CPC title

• C07C2521/02

  Boron or aluminium; Oxides or hydroxides thereof · CPC title

• C07C2521/10

  Magnesium; Oxides or hydroxides thereof · CPC title

• C07C5/46 Primary

  with sulfur or a sulfur-containing compound as an acceptor · CPC title

• C07C2527/049

  with iron group metals or platinum group metals · CPC title