Methane Bromination for Hydrogen and Carbon Production
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Solution Overview
Problem
Current natural gas conversion processes, such as those involving oxygen, result in the formation of carbon dioxide and water, which are inefficient in terms of carbon usage and require high energy for further transformation into valuable chemicals.
Innovation Solution
A process that converts methane into hydrogen and carbon through bromination, where methane is contacted with bromine to form methyl bromides and hydrogen bromide, allowing for the recycling of bromine and the production of carbon in the form of graphite or carbon black without forming water or carbon dioxide, utilizing bromine-mediated activation and electrolysis for energy-efficient hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If oxygen-based processes are used for natural gas conversion, then the conversion process is practical and commercial, but carbon dioxide and water are formed reducing carbon efficiency to below 75%
Solution Approach 1:
The invention extracts oxygen from the conversion process entirely, replacing it with bromine as the activating agent. This removal of oxygen prevents the formation of carbon dioxide and water, allowing carbon to be recovered in solid form with carbon efficiency exceeding 95%.
Solution Approach 2:
Bromine serves as an intermediary substance that activates methane without requiring oxygen. The bromine-mediated activation allows methane conversion to proceed through a different chemical pathway that produces solid carbon and hydrogen bromide instead of carbon dioxide and water.
2Ease of repair
If oxygen is used for bromine recovery in G2A technology, then bromine can be recycled, but water is produced and the process is no longer oxygen-free
Solution Approach 1:
The invention replaces the chemical mechanism of oxygen-based bromine recovery with an electrolytic process. Electrical energy drives the decomposition of hydrogen bromide to regenerate bromine, eliminating the need for oxygen and preventing water formation.
Solution Approach 2:
The invention changes the energy input parameter from chemical (oxygen) to electrical (electrolysis). This parameter change fundamentally alters the reaction pathway, allowing bromine recovery without water production and maintaining the oxygen-free nature of the process.
3Productivity
If reforming processes (SMR, ATR, DMR, PDX) are used, then synthesis gas is produced for further conversion, but carbon dioxide and water are formed requiring high energy for further transformation
Solution Approach 1:
The invention extracts the oxygen-dependent steps from the traditional reforming pathway. By using bromine-mediated activation, the process produces solid carbon and hydrogen directly without forming carbon dioxide and water, eliminating the need for energy-intensive downstream transformations.
Solution Approach 2:
Instead of converting carbon to carbon dioxide and then requiring energy-intensive reduction to useful chemicals, the invention inverts the approach by directly producing solid carbon as a valuable product and hydrogen as the other output, reversing the traditional energy-flow direction.
4Productivity
If oxidative conversion processes are used, then methane is converted to chemicals, but carbon dioxide and water are formed in final product streams
Solution Approach 1:
Bromine acts as an intermediary that enables methane activation and conversion without introducing oxygen into the system. This allows high productivity chemical conversion while maintaining oxygen-free conditions that preserve carbon in useful solid forms.
Solution Approach 2:
The invention substitutes oxidative chemistry with bromine-mediated chemistry throughout the conversion process. This fundamental substitution of the chemical mechanism eliminates carbon dioxide formation while maintaining efficient methane conversion to valuable products.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process enhances carbon recovery and production while avoiding the formation of carbon dioxide and water, achieving high carbon efficiency and reducing energy costs by recycling bromine and converting methane into hydrogen using renewable energy.
Implementation Method 1
bromine-mediated activation of methane
Implementation Method 2
electrolysis for energy-efficient hydrogen production
Data Source
AI summary
The disclosure relates in its first aspect to a process of conversion of a gaseous stream comprising methane into hydrogen (51) and carbon (25), the process is remarkable in that it comprises a step (a) of providing a first gaseous stream (3, 7); a step (b) of bromination and synthesis in which the first gaseous stream (3, 7) is put in contact with a second stream (53) comprising bromine resulting in the formation of a third stream (15) comprising methyl bromides and hydrogen bromide, and of a fourth stream (25) comprising carbon including graphite and/or carbon black; a step (c) of separation performed on the third stream (15) to recover a hydrogen bromide-rich stream (41) which is then oxidized in a step (d) to produce a stream (51) comprising hydrogen. The second aspect relates to the installation for performing the process of the first aspect and the third aspect concerns the use of bromine in such process.