Methanol Synthesis Process Carbon Dioxide Recovery
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Solution Overview
Problem
Current methanol synthesis processes from synthesis gas face inefficiencies due to the emission of carbon dioxide and the accumulation of inert gases, leading to reduced methanol conversion and increased energy consumption, as well as the need for larger equipment and complex gas scrubbing units.
Innovation Solution
A process where synthesis gas containing carbon monoxide, carbon dioxide, and hydrogen is converted into methanol, with the subsequent separation and reuse of valuable components like carbon dioxide, carbon monoxide, and methane through a combustion unit using an oxygen-rich gas, followed by carbon dioxide recovery and recycling, avoiding direct recirculation of inert gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If synthesis gas is used for methanol synthesis, then methanol production is achieved, but carbon dioxide emissions occur and valuable components are wasted
Solution Approach 1:
The patent recovers and reuses valuable components (carbon dioxide, carbon monoxide, methane) from the synthesis gas that would otherwise be wasted or emitted. These components are captured from the reaction mixture and fed back into the methanol synthesis process, converting what would be losses into useful resources for continued methanol production.
Solution Approach 2:
The patent implements a feedback loop where the output streams containing unreacted synthesis gas components are fed back into the reaction system. This continuous recycling of carbon-containing species ensures maximum utilization of feedstock and minimizes carbon dioxide emissions while maintaining high methanol yield.
2Productivity
If inert gases are recirculated in the process, then gas utilization is improved, but equipment size increases and complexity increases
Solution Approach 1:
The patent extracts and removes inert gases from the recirculation stream, separating them from the valuable carbon-containing components. By taking out the inert gases (nitrogen, argon, methane) from the recycle loop, the system avoids the need for oversized equipment while still maximizing utilization of the valuable synthesis gas components.
3Ease of manufacture
If carbon dioxide is emitted during synthesis, then process simplicity is maintained, but environmental impact increases and resource efficiency decreases
Solution Approach 1:
The patent converts the potentially harmful carbon dioxide emissions into a beneficial resource by capturing and reusing the carbon dioxide in the synthesis gas. This transforms what would be a waste product and environmental hazard into a valuable feedstock for continued methanol production, improving resource efficiency while maintaining process feasibility.
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 approach enhances methanol yield and purity by fully utilizing carbon-containing components, reduces carbon dioxide emissions, and simplifies equipment design by minimizing inert gas accumulation, while maintaining the use of standard methanol synthesis apparatus and processes.
Implementation Method 1
the conversion of synthesis gas to methanol typically takes place in the so-called low-pressure process at a pressure range of 5 to 10 MPa abs using copper- and zinc-containing methanol synthesis catalysts
Implementation Method 2
the valuable components carbon monoxide, carbon dioxide, dimethyl ether and methane of the streams (IV) as well as of at least one of the two streams (V) and (VII) are supplied to a combustion unit (F) and are added therein by supplying a oxygen-containing gas (XI), which has an oxygen content of 30 to 100 vol.%, is combusted and forms carbon dioxide-containing flue gas (XII)
Implementation Method 3
separates a carbon dioxide-enriched stream (XIV) from the carbon dioxide-containing flue gas (XII) from stage (f) in a carbon dioxide recovery unit (G)
Data Source
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AI summary
The invention relates to a method for producing methanol from a carbonaceous feedstock, in which method synthesis gas is generated therefrom in a synthesis gas generation unit, the synthesis gas is converted into methanol in a methanol synthesis unit and the obtained reaction mixture is reprocessed in stages in order to isolate the methanol. Using an oxygen-containing gas, the valuable components carbon monoxide, carbon dioxide, dimethyl ether and methane are burnt off the streams separated during the isolation of the methanol, the carbon dioxide of the resulting flue gas is separated in a carbon dioxide recovery unit and is returned to the syngas generation unit and/or to the methanol synthesis unit.