Formic Acid Production from CO2 via Amine Scrubbing and Crystallization
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Solution Overview
Problem
Conventional methods for producing formic acid from carbon dioxide are inefficient and lack a durable process for converting captured CO2 into valuable end-products, with challenges in carbon dioxide capture and downstream processing.
Innovation Solution
A process involving carbon capture in an amine solution to form ammonium bicarbonate salts, followed by crystallization and hydrogenation to produce formic acid, utilizing a closed-top scrubber and stripper column for efficient separation and conversion, with a modular system for effective carbon dioxide utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used for producing formic acid from carbon dioxide, then the process can be implemented, but the efficiency is low and the process is not durable
Solution Approach 1:
The process is divided into distinct operational modules: carbon capture unit, crystallization unit, hydrogenation unit, and stripper column. Each module performs a specific function, allowing for optimized operation and maintenance of individual components while maintaining overall process efficiency and durability.
Solution Approach 2:
The process utilizes controlled changes in temperature and pressure parameters to achieve efficient conversion. The stripper column operates at elevated temperatures (50-150°C) to facilitate the decomposition of ammonium formate into formic acid, while the crystallization unit controls temperature to precipitate ammonium bicarbonate salts, thereby optimizing each stage for maximum efficiency and reliability.
2Productivity
If carbon dioxide is captured in amine solution, then conversion to ammonium bicarbonate salts is achieved, but the ammonium salts require additional processing steps
Solution Approach 1:
The crystallization and hydrogenation steps are integrated into a continuous process flow. The ammonium bicarbonate crystals obtained from crystallization are directly fed to the hydrogenation unit without intermediate handling, merging two separate operations into a seamless sequence that reduces overall complexity while maintaining high conversion efficiency.
Solution Approach 2:
Ammonium formate serves as an intermediary compound that bridges the carbon capture and formic acid production stages. It is formed from ammonium bicarbonate through hydrogenation and then decomposes in the stripper column to yield formic acid, acting as a crucial intermediate that enables efficient conversion while simplifying the overall process architecture.
3Manufacturing precision
If the stripper column is used to separate amine and formic acid, then high purity formic acid is obtained, but energy consumption increases
Solution Approach 1:
The stripper column utilizes phase transition of the amine from liquid to vapor state through heating. The amine has sufficient volatility to vaporize at the operating temperatures (50-150°C), allowing for efficient separation from formic acid which remains in the liquid phase, thereby achieving high purity product with moderate energy input.
Solution Approach 2:
The process optimizes temperature parameters to achieve selective vaporization. By maintaining temperatures in the range of 50-150°C, the system exploits the difference in volatility between amine and formic acid, enabling efficient separation without requiring excessive energy input that would be necessary for higher temperature operations.
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 a highly efficient and durable production of formic acid from carbon dioxide, ensuring high yields and minimizing waste, with a modular system for efficient heat integration and recycling, thereby addressing the inefficiencies of conventional methods.
Implementation Method 1
carbon dioxide is first captured in an amine solution with the help of an amine solution, hereby converting the carbon dioxide to ammonium bicarbonate salts
Implementation Method 2
The ammonium salts precipitate out and form a slurry together with the solvent, and can then be removed from the slurry by a crystallization step
Implementation Method 3
By hydrogenating the ammonium salts, ammonium formate salts are formed
Implementation Method 4
To produce formic acid the mixture is heated in a stripper column and the ammonium formate splits into formic acid and the amine
Data Source
AI summary
The present invention concerns a process for producing formic acid, comprising (a) a carbon capture step wherein a source of carbon dioxide is contacted with an amine solution in a closed-top scrubber, to obtain an ammonium bicarbonate solution; (b) inducing crystallization in the ammonium bicarbonate solution to obtain a concentrated ammonium bicarbonate solution; (c) subjecting the concentrated ammonium bicarbonate solution to a hydrogenation step to obtain an ammonium formate; and (d) heating the ammonium formate to a temperature in the range of 50 - 150 °C, to obtain a gaseous product containing the amine and a liquid product stream containing formic acid. Herein, the source of carbon dioxide has a carbon dioxide content of at least 95 vol% and the amine used in step (a) and reformed in step (d) has a partial vapour pressure above a 40 wt% solution of the amine in water at 20 °C of at least 40 kPa. The present invention further concerns a system for performing the process according to the invention.