CO2 Hydrogenation to Formic Acid via Compressed CO2 Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for hydrogenating CO2 to formic acid are thermodynamically unfavorable and require stoichiometric amounts of stabilizers, leading to energy-intensive and economically unattractive processes with difficulties in separating formic acid from stabilizers and catalysts.
Innovation Solution
A process involving the catalytic reaction of CO2 with hydrogen in the presence of a base, followed by partial removal of formic acid using compressed CO2, which allows for continuous operation and eliminates the need for separate purification steps, using compressed CO2 to extract formic acid and retain catalyst activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stoichiometric amounts of stabilizer (base) are used to enable CO2 hydrogenation to formic acid, then the reaction can proceed, but the separation of formic acid from stabilizers becomes energy-intensive and economically unattractive
Solution Approach 1:
The patent extracts the formic acid product from the reaction mixture using compressed CO2 as a selective extraction medium. The compressed CO2 selectively dissolves formic acid while leaving the stabilizer (base) and catalyst in the reaction phase, enabling easy separation without energy-intensive distillation or additional purification steps.
Solution Approach 2:
The patent utilizes phase transitions of CO2 (between gas, liquid, and supercritical states) to control the extraction process. By adjusting pressure and temperature, CO2 transitions to a supercritical state for extraction, then returns to gaseous state for easy separation from the extracted formic acid, avoiding energy-intensive separation methods.
2Manufacturing precision
If traditional separation steps are used to separate formic acid from stabilizers and catalysts, then pure formic acid can be obtained, but the process becomes energetically and economically unattractive
Solution Approach 1:
The compressed CO2 selectively extracts formic acid from the reaction mixture, separating it from both stabilizers and catalysts in a single step. This extraction method achieves high purity formic acid without requiring multiple separation steps, distillation, or energy-intensive purification processes.
Solution Approach 2:
Compressed CO2 acts as an intermediary extraction medium that selectively transports formic acid from the reaction phase to the extraction phase. This intermediary enables clean separation of formic acid from both stabilizers and catalysts without direct contact between formic acid and the catalyst, maintaining product purity while simplifying the separation process.
3Ease of manufacture
If compressed CO2 is used to remove formic acid from the reaction zone, then separation from stabilizers is eliminated and catalyst activity is preserved, but additional process equipment is required
Solution Approach 1:
Compressed CO2 serves multiple functions in the process: it acts as a reactant in the hydrogenation reaction, serves as the extraction medium for removing formic acid, and functions as a carrier gas for transporting the extracted formic acid. This multi-functionality reduces the need for additional separate systems and simplifies the overall process design.
Solution Approach 2:
The system uses compressed CO2, which is already present as a reactant in the process, to perform the extraction function. This self-service approach eliminates the need for introducing a completely separate extraction solvent or purification agent, reducing equipment complexity and process 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 process achieves high-purity formic acid production without the need for additional purification, enables continuous operation, and reduces energy and material costs by avoiding the separation of formic acid from stabilizers and catalysts.
Implementation Method 1
the formic acid dissolves in CO2 and can thus be removed from the reaction area extractively
Implementation Method 2
The term 'compressed CO2' as used in the present invention means, in particular, that CO2 is used in gaseous (but compressed), supercritical, or liquid form
Implementation Method 3
Catalytic reaction of CO2 with hydrogen in the presence of a base to form formic acid
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a continuous method for producing formic acid from CO2, extracting the formic acid using compressed CO2.