Anionic Electrochemical Compressor Using pH Swing for CO₂ Compression
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Solution Overview
Problem
Mechanical compressors face challenges in efficiently compressing carbon dioxide due to high pressures and compression ratios, leading to mechanical malfunctions, noise, and high costs, while existing electrochemical compressors are hindered by the lack of advanced anionic membranes.
Innovation Solution
An anionic electrochemical compressor utilizing a pH swing absorption-desorption system with an anionic membrane and an external electric field to facilitate carbon dioxide compression, eliminating moving parts and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical compressors are used to compress carbon dioxide, then compression can be achieved, but high pressures and high compression ratios lead to mechanical malfunctions, noise, and high costs
Solution Approach 1:
The patent replaces the mechanical compression system with an electrochemical compression system. Instead of using mechanical moving parts that suffer from wear and high stress, the invention uses electrochemical reactions at electrodes to compress carbon dioxide, eliminating the problems associated with mechanical compression at high pressures.
Solution Approach 2:
The patent changes the operating parameters of the compression system by using electrochemical potentials and pH gradients instead of mechanical pressure ratios. This allows compression to occur through electrochemical reactions rather than mechanical force, fundamentally changing how the compression parameter is achieved.
2Reliability
If mechanical compressors are used to compress carbon dioxide, then compression can be achieved, but noise is generated
Solution Approach 1:
The patent eliminates noise by replacing the mechanical compression system with an electrochemical system. The electrochemical compressor uses electrochemical reactions at electrodes separated by an anionic membrane, with no moving parts that would generate mechanical noise, thus providing silent operation while maintaining compression performance.
3Productivity
If advanced anionic membranes are developed for electrochemical compression, then efficient carbon dioxide compression can be achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs an anionic membrane with specific porous structure that allows selective transport of ions while blocking carbon dioxide molecules. The porous structure enables efficient electrochemical compression by facilitating ion conduction, and the membrane can be manufactured using established porous material fabrication techniques.
Solution Approach 2:
The anionic membrane is constructed as a composite material combining polymer matrices with ionic functional groups, creating a material that possesses both mechanical integrity and selective ion transport properties. This composite structure enables efficient carbon dioxide compression while using materials that can be manufactured with existing technologies.
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
The solution provides a noiseless, efficient, and scalable carbon dioxide compression method, reducing energy consumption and operational costs, and enabling wider market adoption.
Implementation Method 1
an anionic membrane with a significant hydroxide/hydronium gradient imposed on it by an outside electric field
Implementation Method 2
pH swing absorption-desorption system with an anionic membrane and an external electric field to facilitate carbon dioxide compression
Data Source
AI summary
An electrochemical compressor utilizes an anion conducting layer disposed between an anode and a cathode for transporting a working fluid. The working fluid may include carbon dioxide that is dissolved in water and is partially converted to carbonic acid that is equilibrium with bicarbonate anion. An electrical potential across the anode and cathode creates a pH gradient that drives the bicarbonate anion across the anion conducting layer to the cathode, wherein it is reformed into carbon dioxide. Therefore, carbon dioxide is pumped across the anion conducting layer. The compressor may be part of a refrigeration system that pumps the working fluid in a closed loop through a condenser and an evaporator.