Formic Acid Synthesis Under Anhydrous Catalytic Conditions
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Solution Overview
Problem
The existing methods for producing formic acid from hydrogen and carbon dioxide face challenges due to high energy barriers and instability, with formic acid decomposing into hydrogen and carbon dioxide, necessitating complex separation processes.
Innovation Solution
A method involving the use of organic metal complex catalysts or metal-supported solid catalysts under anhydrous conditions at high pressures to produce formic acid directly from hydrogen and carbon dioxide, with a catalyst containing organic iridium or ruthenium complexes and specific metals supported on a carrier, in the absence of a significant water content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If formic acid is produced from hydrogen and carbon dioxide using conventional methods, then formic acid can be generated, but the formic acid decomposes into hydrogen and carbon dioxide due to instability
Solution Approach 1:
The patent changes the water content parameter from conventional aqueous conditions to anhydrous conditions (water content of 10% by mass or less). This parameter change prevents the decomposition reaction of formic acid while maintaining the carboxylation reaction, thereby resolving the stability contradiction
Solution Approach 2:
The patent introduces a specific catalyst system (organic metal complex catalysts or metal-supported solid catalysts) as an intermediary that enables selective carboxylation reaction. The catalyst mediates the reaction between hydrogen and carbon dioxide to produce stable formic acid under anhydrous conditions, preventing decomposition
2Ease of manufacture
If formic acid is produced from hydrogen and carbon dioxide, then formic acid can be generated, but complex separation processes are required due to decomposition into hydrogen and carbon dioxide
Solution Approach 1:
By changing the water content parameter to anhydrous conditions (10% by mass or less), the patent eliminates the decomposition issue that would otherwise require complex separation processes. This simplifies the overall manufacturing process while maintaining formic acid production
Solution Approach 2:
The patent extracts water from the reaction system by conducting the reaction under anhydrous conditions. This removal of water prevents the decomposition reaction, thereby eliminating the need for complex separation processes to remove decomposition products
3Productivity
If aqueous medium is used in production of formic acid from hydrogen and carbon dioxide, then the reaction can proceed, but the formic acid decomposes into hydrogen and carbon dioxide
Solution Approach 1:
The patent changes the water content parameter from conventional aqueous conditions to anhydrous conditions (10% by mass or less). This parameter change simultaneously maintains production efficiency through catalysis while preventing decomposition, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent applies local quality control by specifically controlling the water content in the reaction medium to be 10% by mass or less. This localized control of water content in the reaction environment enables both efficient formic acid production and stability without requiring aqueous conditions
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
Stable formic acid is produced efficiently without decomposing into hydrogen and carbon dioxide, overcoming the instability issues of previous methods.
Implementation Method 1
the formic acid is produced when the hydrogen and the carbon dioxide are mixed at a high pressure under an anhydrous condition in the presence of various organic metal complex catalysts or various solid catalysts
Data Source
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AI summary
A method for producing formic acid comprises reacting hydrogen and carbon dioxide in the presence of a catalyst, using either a reaction medium containing 10% by mass or less water, or no reaction medium. The catalyst comprises an organic iridium complex or an organic ruthenium complex. The reaction is conducted at a hydrogen partial pressure of at least 0.05 MPa and a carbon dioxide partial pressure of at least 0.05 MPa.