Ethanol Synthesis from Syngas via Methanol and Ether Intermediates
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Solution Overview
Problem
Current methods for producing ethanol from synthesis gas are inefficient, as they do not effectively convert hydrogen and carbon monoxide into ethanol, often resulting in byproducts like ethers and unreacted gases.
Innovation Solution
A process involving the reaction of synthesis gas to produce methanol and then converting it into ethers, followed by reacting these ethers with carbon monoxide to produce ethanol, using catalysts like copper oxide and gamma-alumina in controlled conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If synthesis gas is directly converted to ethanol using conventional methods, then the process is simple, but the conversion efficiency is low and byproducts are generated
Solution Approach 1:
The patent divides the ethanol synthesis process into three distinct reaction stages: (1) methanol synthesis from synthesis gas, (2) ether formation from methanol, and (3) ethanol production from ether and synthesis gas. Each stage uses specialized catalysts and operates under optimized conditions, transforming a single inefficient step into a multi-stage efficient process that reduces byproducts and improves overall conversion efficiency.
Solution Approach 2:
The patent performs preliminary conversion of synthesis gas to methanol, and then to ether, before the final ethanol synthesis step. This preliminary action allows the system to prepare intermediate products that are more reactive and suitable for the final ethanol formation, thereby improving the efficiency of the main reaction step and reducing unwanted byproducts.
2Quantity of substance
If synthesis gas is converted to ethanol in a single step, then the process is straightforward, but unreacted hydrogen and carbon monoxide remain
Solution Approach 1:
The patent implements a continuous process where unreacted synthesis gas from the ethanol synthesis step is recycled back to the methanol synthesis step. This continuous action ensures that hydrogen and carbon monoxide are repeatedly utilized across multiple reaction stages, maximizing conversion to ethanol and minimizing losses of unreacted synthesis gas.
Solution Approach 2:
The patent incorporates a feedback mechanism by recycling unreacted synthesis gas from the third reaction step back to the first reaction step. This feedback loop allows the system to continuously adjust and optimize the utilization of hydrogen and carbon monoxide, ensuring high conversion efficiency and reducing substance loss through repeated cycles of reaction and recycling.
3Reliability
If conventional single-stage ethanol synthesis is used, then the equipment requirement is low, but byproduct formation increases
Solution Approach 1:
The patent applies local quality by using different catalysts optimized for each specific reaction stage: copper-based catalysts for methanol synthesis, acid catalysts for ether formation, and modified catalysts for ethanol production from ether. Each catalyst is tailored to its specific function, improving selectivity for ethanol while minimizing byproduct formation at each stage of the process.
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 efficiently converts synthesis gas into ethanol, with the ability to recycle byproducts, enhancing the overall yield and productivity of ethanol production.
Implementation Method 1
Methanol synthesis catalysts which may be employed include, but are not limited to, copper oxide (CuO), zinc oxide (ZnO), and mixtures thereof
Implementation Method 2
In another non-limiting embodiment, the dehydration catalyst is gamma-alumina
Implementation Method 3
the at least one ether is reacted with the carbon monoxide to produce at least one acetate, and the at least one acetate is subjected to hydrogenolysis to produce ethanol
Implementation Method 4
the at least one acetate is subjected to hydrogenolysis to produce ethanol
Data Source
AI summary
A process for producing ethanol from synthesis gas by reacting the hydrogen and carbon monoxide of the synthesis gas to provide methanol, which then is subjected to dehydration to produce at least one ether, such as dimethyl ether. The ether, such as dimethyl ether, then is subjected to carbonylation with unreacted carbon monoxide from the synthesis gas to provide at least one acetate, such as methyl acetate. The acetate then is subjected to hydrogenolysis to produce ethanol.