Methanol Production via Oxidative Bi-Reforming
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Solution Overview
Problem
Current methane conversion processes to methanol and syngas are inefficient, produce unwanted byproducts, and require multiple steps to achieve the desired CO:H2 ratio, leading to energy and carbon footprint issues.
Innovation Solution
A method involving the complete combustion of methane with oxygen to produce CO2 and water, followed by a single-step bi-reforming reaction using the heat generated to produce metgas with a 2:1 CO:H2 ratio, which is then converted to methanol using a catalyst at specific temperatures and pressures, utilizing only methane and atmospheric oxygen as reactants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam reforming or ATR processes are used to produce syngas, then the energy requirement is managed, but multiple steps are needed to adjust the syngas ratio and significant amounts of carbon dioxide byproducts are produced
Solution Approach 1:
The patent combines steam reforming and dry reforming reactions into a single integrated process called bi-reforming. This merging of two separate reforming processes allows simultaneous production of syngas with the desired 1:2 CO:H2 ratio while eliminating the need for multiple separate adjustment steps and reducing carbon dioxide byproduct formation.
Solution Approach 2:
The patent changes the operational parameters by introducing a specific molar ratio of steam to carbon dioxide (2:1) in the bi-reforming process. This parameter adjustment enables direct production of syngas with 1:2 CO:H2 ratio, eliminating the need for subsequent ratio adjustment steps required in conventional steam reforming or ATR processes.
2Quantity of substance
If conventional reforming processes are used, then syngas is produced, but carbon dioxide byproducts need to be separated or disposed
Solution Approach 1:
The patent converts carbon dioxide, which is normally a harmful byproduct requiring disposal, into a useful reactant for dry reforming. By incorporating CO2 into the bi-reforming process, the patent eliminates waste CO2 emissions while simultaneously producing syngas with the desired composition, turning an environmental problem into a process advantage.
3Productivity
If ATR processes are used, then partial oxidation combines with steam reforming, but CO:H2 ratio of 1:2 is not produced in a single step
Solution Approach 1:
The patent achieves precise control of syngas composition by changing the feed parameters - specifically using a steam to carbon dioxide molar ratio of 2:1 in the bi-reforming process. This parameter optimization enables single-step production of syngas with exactly the 1:2 CO:H2 ratio required for methanol synthesis, eliminating the need for additional ratio adjustment steps.
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 method achieves efficient, carbon-neutral, and economically viable production of methanol with minimal byproducts, reducing energy input and carbon footprint, and allowing for flexible scaling and location adaptation.
Implementation Method 1
reacting one equivalent of methane from a methane source with oxygen from the atmosphere under conditions sufficient to result in complete combustion to produce a mixture of carbon dioxide and water
Implementation Method 2
complete combustion to produce a mixture of carbon dioxide and water in a molar ratio of about 1:2 and to generate heat for subsequent use in the method
Implementation Method 3
conducting a single-step bi-reforming reaction with the mixture of methane:carbon dioxide:water and with the heat generated from the complete combustion to form only carbon monoxide and hydrogen
Implementation Method 4
converting the metgas under conditions sufficient to exclusively form methanol
Data Source
AI summary
A method for producing methanol from a methane source such as methane from natural (shale) gas by first reacting one equivalent of methane with oxygen from the air to result in complete combustion to produce carbon dioxide and water in a molar ratio of 1:2; then conducting a bi-reforming process with a mixture of methane:carbon dioxide:water having a ratio of 3:1:2 to produce metgas, a mixture of hydrogen and carbon monoxide having a molar ratio of 2:1 to 2.1:1; and finally converting metgas exclusively to methanol. The thus produced methanol can be dehydrated to form dimethyl ether, with water produced being recycled back to the bi-reforming process, if necessary.