Methods for dehydrogenating hydrocarbons

Patent metadata

Field	Value
Publication number	US-11724974-B2
Application number	US-201917271139-A
Country	US
Kind code	B2
Filing date	Aug 27, 2019
Priority date	Aug 31, 2018
Publication date	Aug 15, 2023
Grant date	Aug 15, 2023

Abstract

According to one or more embodiments described herein, a method for dehydrogenating hydrocarbons may include passing a hydrocarbon feed comprising one or more alkanes or alkyl aromatics into a fluidized bed reactor, contacting the hydrocarbon feed with a dehydrogenation catalyst in the fluidized bed reactor to produce a dehydrogenated product and hydrogen, and contacting the hydrogen with an oxygen-rich oxygen carrier material in the fluidized bed reactor to combust the hydrogen and form an oxygen-diminished oxygen carrier material. In additional embodiments, a dual-purpose material may be utilized which has dehydrogenation catalyst and oxygen carrying functionality.

First claim

The invention claimed is:

1. A method for dehydrogenating hydrocarbons comprising:
passing a hydrocarbon feed comprising one or more alkanes or alkyl aromatics into a first fluidized bed reactor, wherein at least 95 wt. % of the hydrocarbon feed has an atmospheric boiling point of less than or equal to 300° C.;
contacting the hydrocarbon feed with a dehydrogenation catalyst in the first fluidized bed reactor to produce a dehydrogenation effluent comprising hydrogen;
passing the dehydrogenation effluent to a second fluidized bed reactor, wherein the second fluidized bed reactor comprises an oxygen-rich oxygen carrier material, and wherein the oxygen-rich oxygen carrier is reducible;
contacting the hydrogen of the dehydrogenation effluent with the oxygen-rich oxygen carrier material to combust at least a portion of the hydrogen, produce a combustion effluent, and form an oxygen-diminished oxygen carrier material;
passing the oxygen-diminished oxygen carrier material to a first regeneration unit;
oxidizing the oxygen-diminished oxygen carrier material in the first regeneration unit to form the oxygen-rich oxygen carrier material; and
passing the oxygen-rich oxygen carrier material from the first regeneration unit to the second fluidized bed reactor.

2. The method of claim 1 , wherein contacting the hydrogen with the oxygen-rich oxygen carrier material removes from 1 wt. % to 50 wt. % of releasable oxygen from the oxygen-rich oxygen carrier material.

3. The method of claim 1 , wherein the dehydrogenation catalyst in the first fluidized bed reactor is regenerated in a second regeneration unit.

4. The method of claim 1 , further comprising:
passing the combustion effluent out of the second fluidized bed reactor to a third fluidized bed reactor comprising the dehydrogenation catalyst, and
contacting the combustion effluent with the dehydrogenation catalyst in the third fluidized bed reactor to produce a dehydrogenated product.

5. The method of claim 1 , wherein the oxygen carrier material exhibits Geldart A properties or Geldart B properties.

Assignees

• Dow Global Technologies Llc

Inventors

• Blann Kevin
• Kirilin Alexey
• Malek Andrzej
• Sussman Victor
• Pretz Matthew T
• Stears Brien A
• Fish Barry B
• Stangland Eric E
• Goodfellow Brian W
• Sharma Manish

Classifications

• C07C5/48 Primary

  with oxygen as an acceptor · CPC title

• B01J21/04

  Alumina · CPC title

• B01J21/06

  Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• B01J21/10

  Magnesium; Oxides or hydroxides thereof · CPC title

• B01J23/08

  of gallium, indium or thallium · CPC title