Producing high purity hydrogen and carbon monoxide from a hydrocarbon material

Patent metadata

Field	Value
Publication number	US-11787694-B2
Application number	US-202117402487-A
Country	US
Kind code	B2
Filing date	Aug 13, 2021
Priority date	Aug 13, 2021
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

Disclosed are apparatuses, systems, methods, and devices for generating hydrogen pyrolysis of hydrocarbons (methane, diesel, JP8, etc.) in a reactor. The reactor includes multiple channels in parallel. A hydrocarbon flows in a channel and decomposes into hydrogen and carbon. Hydrogen gas flows out and some of the carbon will deposit on the channel wall. Once carbon deposition reaches a predetermined level, the hydrocarbon flow stops, and air or oxygen is caused to flow into the channels to oxidize carbon into carbon monoxide or carbon dioxide and supply heat to neighboring channels. Simultaneously, the hydrocarbon will flow into neighboring channels causing decomposition into hydrogen and carbon in the neighboring channels. When the carbon coating in the neighboring channels reaches a predetermined level, the gas flow is switched again to air or oxygen. In this way, each channel alternates between decomposing the hydrocarbon and oxidizing the deposited carbon.

First claim

What is claimed is:

1. A method of generating hydrogen gas by recycling energy, comprising:
passing a material including one or more hydrocarbon structures through a first conduit that is heated above a desired threshold temperature to cause decomposition of the material into a first mixture that includes a first hydrogen gas and first carbon deposited onto a wall of the conduit;
extracting the first hydrogen gas from the first conduit as part of a hydrogen gas output;
after stopping the passing the material through the first conduit, causing oxidation of the first carbon deposited on the wall of the first conduit to convert the first carbon into a first carbon oxide gas while generating heat;
coupling the heat generated from the first conduit to a second conduit separate from the first conduit;
after stopping the passing the material through the first conduit, passing the material including one or more hydrocarbon structures through the second conduit that is heated above the desired threshold temperature by receiving the heat generated from the first conduit to cause decomposition of the material into a second mixture that includes a second hydrogen gas and second carbon deposited onto a wall of the second conduit;
extracting the second hydrogen gas from the second conduit as part of the hydrogen gas output;
after stopping the passing the material through the second conduit, causing oxidation of the carbon deposited on the wall of the second conduit to convert the second carbon into a second carbon oxide gas while generating heat; and
repeating foregoing operations to recycle energy between the first and second conduits to alternatively extract the first hydrogen gas from the first conduit and the second hydrogen gas from the second conduit sequentially in time to produce the hydrogen gas output.

2. The method of claim 1 , further comprising extracting the first carbon oxide gas from the first conduit and the second carbon oxide gas from the second to produce a carbon oxide gas output.

3. The method of claim 2 , further comprising controlling the oxidation in the first and second conduits to render the first and second carbon oxide gases as carbon monoxide.

4. The method of claim 2 , further comprising controlling the oxidation in the first and second conduits to render the first and second carbon oxide gases as carbon dioxide.

5. The method of claim 1 , wherein the material includes methane.

6. The method of claim 1 , wherein the material includes a fluid that includes diesel, gasoline, or kerosene.

7. The method of claim 1 , wherein the material includes JP8.

8. The method of claim 1 , wherein the material includes methane, and wherein the step of causing decomposition of the material is controlled so that the decomposition in the first and second conduit occurs in accordance with the endothermic chemical equation:
CH4=C+2H2+75 kJ.

9. The method of claim 1 , wherein the oxidation is controlled to be:
C+02=CO2−390 kJ.

10. The method of claim 1 , wherein the oxidation is controlled to be:
C+1/2O2=CO−110kJ.

11. The method of claim 1 , wherein the material includes natural gas, propane, ethane, butane, or another hydrocarbon gas.

12. The method of claim 1 , wherein the recycling energy between the first and second conduits is a self-sustaining cycle not requiring external heat.

Assignees

• General Atomics

Inventors

• Zhang Jiping
• Sheeder Jonathan David
• Schleicher Robert
• Opperman Jonas

Classifications

• C01B3/24 Primary

  of hydrocarbons · CPC title

• B01J19/248

  Reactors comprising multiple separated flow channels · CPC title

• B01J19/2445

  placed in parallel · CPC title

• C01B32/40

  Carbon monoxide · CPC title

• C01B32/50

  Carbon dioxide · CPC title