Three-Chamber Electrolysis Cell With Mechanical Stirring
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Solution Overview
Problem
The existing electrolytic cells with solid electrolytes like NaSICON face challenges due to pH gradients forming in the middle chamber during electrolysis, leading to damage and reduced longevity of the electrolyte, as well as inefficient use of alkali metal alkoxide solutions.
Innovation Solution
Incorporating a mechanical stirring device in the middle chamber of a three-chamber electrolytic cell, separated by a cation-conducting solid electrolyte and a diffusion barrier, to prevent pH gradients and enhance the stability and efficiency of alkali metal alkoxide production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-chamber electrolytic cell with solid electrolyte (NaSICON) is used to protect it from acidic anolyte, then the electrolyte stability is improved, but a pH gradient forms in the middle chamber leading to local corrosion and reduced electrolyte lifespan
Solution Approach 1:
A mechanical stirring device is introduced in the middle chamber to dynamically mix the electrolyte solution, preventing the formation of static pH gradients. The stirring converts the static electrolyte environment into a dynamic one, ensuring uniform pH distribution and preventing localized acid accumulation that would otherwise corrode the solid electrolyte.
Solution Approach 2:
The invention changes the physical state parameter of the electrolyte in the middle chamber from static to dynamic by introducing mechanical stirring. This parameter change affects the pH distribution uniformity, preventing local pH drops and the associated corrosion of the solid electrolyte while maintaining its protective function.
2Reliability
If the middle chamber is supplied with alkaline solution from the cathode chamber to protect the solid electrolyte, then the electrolyte protection is improved, but the alkali metal alkoxide solution is consumed and contaminated
Solution Approach 1:
The middle chamber is equipped with a mechanical stirring device that enables it to self-regulate its pH environment. The stirring promotes uniform distribution of OH- ions produced during electrolysis, allowing the middle chamber to maintain alkaline conditions and protect the solid electrolyte autonomously, without requiring continuous supply of alkaline solution from the cathode chamber.
Solution Approach 2:
The invention changes the pH control mechanism in the middle chamber from passive (relying on solution supply from cathode chamber) to active (using mechanical stirring to distribute OH- ions uniformly). This parameter change in pH distribution uniformity allows protection of the solid electrolyte while preventing consumption and contamination of the alkali metal alkoxide solution.
3Device complexity
If no stirring is applied in the middle chamber, then the device complexity is reduced, but pH gradients form causing local corrosion and reduced productivity
Solution Approach 1:
A mechanical stirring device is introduced to create dynamic mixing in the middle chamber, converting the static electrolyte environment into a dynamic one. This dynamic mixing prevents pH gradient formation and associated corrosion, maintaining high electrolysis efficiency without significantly increasing device complexity.
Solution Approach 2:
The invention introduces a parameter change from static to dynamic electrolyte mixing in the middle chamber. This change prevents local pH drops and corrosion, maintaining optimal electrolysis conditions and productivity while adding only a simple stirring mechanism to the cell structure.
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 mechanical stirring effectively prevents pH gradients, extending the lifespan of the solid electrolyte and improving the economical use of alkali metal alkoxide solutions by maintaining stable conditions and reducing corrosion.
Implementation Method 1
The mechanical stirring device can be used to stir the electrolyte solution in the middle chamber during electrolysis, which prevents the formation of a pH gradient.
Implementation Method 2
a concentration gradient forms in the middle chamber of the electrolytic cell during electrolysis
Implementation Method 3
The cathode compartment and the anode compartment are separated by a ceramic which conducts the alkali metal ion used, for example NaSICON
Implementation Method 4
from the anode chamber by a diffusion barrier
Implementation Method 5
When a current is applied, chlorine is formed at the anode - if a chloride salt of the alkali metal is used - and hydrogen and alcohol ions are formed at the cathode.
Implementation Method 6
the pH drops in the anode chamber during electrolysis as a result of oxidation processes
Data Source
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AI summary
The present invention relates, in a first aspect, to an electrolysis cell comprising three chambers, wherein the middle chamber is separated from the cathode chamber by a solid electrolyte permeable to cations, for example NaSICON, and from the anode chamber by a diffusion barrier, for example, a membrane selective for cations or anions. The invention is characterized in that the middle chamber includes a mechanical stirring device. The electrolysis cell according to the invention solves the problem that a concentration gradient forms in the middle chamber of the electrolysis cell during electrolysis, leading to locally lowered pH values and thus to damage of the solid electrolyte. The electrolyte solution in the middle chamber can be stirred during electrolysis by means of the mechanical stirring device.This leads to a mixing of the electrolyte solution in the central chamber, thereby preventing the formation of a pH gradient. In a second aspect, the present invention relates to a method for producing an alkali metal alkoxide solution in the electrolysis cell according to the invention.