Soot control in oxidation reactions

Patent metadata

Field	Value
Publication number	US-9540240-B2
Application number	US-201414306428-A
Country	US
Kind code	B2
Filing date	Jun 17, 2014
Priority date	Jun 17, 2013
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Soot formation in the partial oxidation of carbonaceous feed is controlled by controlling the momentum of the oxidant stream relative to the momentum of the carbonaceous feed stream.

First claim

What is claimed is:

1. An improved method of treating a gaseous feed material that contains one or more hydrocarbons, the method comprising
feeding a feed stream consisting of the gaseous feed material to a reactor, and feeding a stream consisting of hot oxidant containing oxygen to the reactor, and adding together in the reactor the hot oxidant stream containing oxygen with the feed stream of the gaseous feed material, to mix in the reactor under reaction conditions effective to partially oxidize one or more hydrocarbons in said feed material to produce a product stream that contains hydrogen and CO,
while maintaining the ratio of the momentum of the oxidant stream relative to the momentum of the feed stream, when the oxidant stream is added to the feed stream, so that said ratio is less than the ratio of the momentum of the oxidant stream relative to the momentum of the feed stream at which, under otherwise identical reaction conditions including the temperature of the feed stream, the temperature of the oxidant stream, and the stoichiometric ratio, the soot content of the product stream is 5 gm/Nm 3 higher than the soot content of the feed stream to which the oxidant stream is added.

2. The method of claim 1 comprising maintaining the ratio of the momentum of the oxidant stream relative to the momentum of the feed stream, when the oxidant stream is added to the feed stream, so that said ratio is less than the ratio of the momentum of the oxidant stream relative to the momentum of the fed stream at which, under otherwise identical reaction conditions, the soot content of the product stream is 2 gm/Nm 3 higher than the soot content of the feed stream to which the oxidant stream is added.

3. The method of claim 1 comprising maintaining the ratio of the momentum of the oxidant stream relative to the momentum of the feed stream, when the oxidant stream is added to the feed stream, so that said ratio is less than the ratio of the momentum of the oxidant stream relative to the momentum of the fed stream at which, under otherwise identical reaction conditions, the soot content of the product stream is 1 gm/Nm 3 higher than the soot content of the feed stream to which the oxidant stream is added.

4. The method of claim 1 wherein the feed material has been obtained by gasification of carbonaceous feed material.

5. The method of claim 1 wherein the feed material comprises natural gas.

6. An improved method of treating a gaseous feed material that contains one or more hydrocarbons, the method comprising
feeding a feed stream consisting of the gaseous feed material to a reactor, and feeding a stream consisting of hot oxidant containing oxygen to the reactor, and adding together in the reactor the hot oxidant stream containing oxygen with the feed stream of the gaseous feed material, to mix in the reactor under reaction conditions effective to partially oxidize one or more hydrocarbons in said feed material to produce a product stream that contains hydrogen and CO,
while maintaining the ratio of the momentum of the oxidant stream relative to the momentum of the feed stream, when the oxidant stream is added to the feed stream, so that the soot content of the product stream is less than 5 gm/Nm 3 higher than the soot content of the feed stream.

7. The method of claim 6 comprising maintaining the ratio of the momentum of the oxidant stream relative to the momentum of the feed stream, when the oxidant stream is added to the feed stream, so that the soot content of the product stream is less than 2 gm/Nm 3 higher than the soot content of the feed stream.

8. The method of claim 6 comprising maintaining the ratio of the momentum of the oxidant stream relative to the momentum of the feed stream, when the oxidant stream is added to the feed stream, so that the soot content of the product stream is less than 1 gm/Nm 3 higher than the soot content of the feed stream.

9. The method of claim 6 wherein the feed material has been obtained by gasification of carbonaceous feed material.

10. The method of claim 6 wherein the feed material comprises natural gas.

11. An improved method of treating a gaseous feed material that contains one or more hydrocarbons, the method comprising
feeding a feed stream consisting of the gaseous feed material to a reactor, and feeding a stream consisting of hot oxidant containing oxygen to the reactor, and adding together in the reactor the hot oxidant stream containing oxygen with the feed stream of the gaseous feed material, to mix in the reactor under reaction conditions effective to partially oxidize one or more hydrocarbons in said feed material to produce a product stream that contains hydrogen and CO,
under reaction conditions, including the temperature of the feed stream, the temperature of the oxidant stream, and the stoichiometric ratio, under which if the partial oxidation reaction is practiced with a given ratio of the momentum of the oxidant stream relative to the momentum of the feed stream the soot content of the product stream would be 5 gm/Nm 3 higher than the soot content of the feed stream,
and carrying out the partial oxidation reaction with a ratio of the momentum of the oxidant stream relative to the momentum of the feed stream when the streams are added together that is less than the given ratio but under otherwise identical reaction conditions,
wherein the soot content of the product stream is less than 5 gm/Nm 3 higher than the soot content of the feed stream.

12. The method of claim 11 wherein said oxidant stream and said feed stream are mixed and reacted under reaction conditions, including the temperature of the feed stream, the temperature of the oxidant stream, and the stoichiometric ratio, under which if the partial oxidation reaction is practiced with a given ratio of the momentum of the oxidant stream relative to the momentum of the feed stream the soot content of the product stream would be 2 gm/Nm 3 higher than the soot content of the feed stream, and wherein the soot content of the product stream is less than 2 gm/Nm 3 higher than the soot content of the feed stream.

13. The method of claim 11 wherein said oxidant stream and said feed stream are mixed and reacted under reaction conditions, including the temperature of the feed stream, the temperature of the oxidant stream, and the stoichiometric ratio, under which if the partial oxidation reaction is practiced with a given ratio of the momentum of the oxidant stream relative to the momentum of the feed stream the soot content of the product stream would be 1 gm/Nm 3 higher than the soot content of the feed stream, and wherein the soot content of the product stream is less than 1 gm/Nm 3 higher than the soot content of the feed stream.

14. The method of claim 1 or claim 6 or claim 11 , wherein the product stream contains methane, and the momentum and the temperature of the oxidant stream added to the feed stream are controlled to control the amount of methane in the product stream.

Assignees

• Damstedt Bradley
• Bool Lawrence
• Riley Michael
• Praxair Technology Inc

Inventors

• Damstedt Bradley
• Bool Lawrence
• Riley Michael

Classifications

• C01B2203/0255

  containing a non-catalytic partial oxidation step · CPC title

• C01B3/36 Primary

  using oxygen; using mixtures containing oxygen as gasifying agents · CPC title