Electrochemical Metal Hydroxide Generation via Silicate Dissolution
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Solution Overview
Problem
Conventional methods for producing hydrogen, oxygen, and metal hydroxides emit significant CO2 emissions and rely on rare and expensive metal salts, leading to high production costs and environmental impact.
Innovation Solution
An electrochemical system that uses a metal silicate to generate metal hydroxide, oxygen, and hydrogen, where a metal salt solution is produced by reacting an acidic solution with a solid metal silicate, and the system includes ion-exchange membranes and a purification unit to remove impurities and recycle the electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional electrolysis uses rare metal salts as electrolytes, then metal hydroxide production is achieved, but production cost increases and availability decreases
Solution Approach 1:
The invention changes the chemical composition parameter of the electrolyte from rare metal salts to abundant metal silicates (such as magnesium silicate). This parameter change allows the use of common, inexpensive materials while maintaining electrolytic function through the generation of metal ions during the process.
Solution Approach 2:
The invention replaces expensive, rare metal salts with cheap, abundant metal silicate materials. The metal silicate serves as a disposable or regenerable source of metal ions, eliminating the need for costly electrolyte replenishment associated with rare metal salts.
2Productivity
If conventional electrolysis produces chlorine gas at the anode, then metal hydroxide is produced, but harmful chlorine gas is generated
Solution Approach 1:
The invention converts the harmful chlorine gas production into beneficial oxygen gas production by changing the anode reaction. Instead of chloride oxidation producing Cl2, the system uses water oxidation to produce O2, eliminating the harmful byproduct while maintaining electrolytic efficiency.
Solution Approach 2:
The invention changes the electrolyte composition parameter to eliminate chloride ions, thereby changing the anode reaction product from chlorine gas to oxygen gas. This parameter change in electrolyte composition fundamentally alters the harmful output of the process.
3Productivity
If conventional hydrogen production methods are used, then hydrogen is produced, but significant CO2 emissions are generated
Solution Approach 1:
The invention replaces thermal/chemical hydrogen production methods (steam reforming, gasification) with electrochemical water electrolysis. This substitution eliminates or significantly reduces CO2 emissions by using electricity to directly split water into hydrogen and oxygen, with the option to use renewable or low-carbon electricity sources.
4Quantity of substance
If metal silicate is added to the electrolytic system, then abundant material source is utilized, but system complexity increases
Solution Approach 1:
The invention segments the electrolytic system into distinct functional zones using ion-exchange membranes. The metal silicate dissolution occurs in a separate anode compartment, while the cathode compartment maintains controlled electrolyte composition. This segmentation allows the use of abundant metal silicates without complicating the overall system design.
Solution Approach 2:
The invention introduces ion-exchange membranes as intermediary elements that facilitate the use of metal silicates. These membranes selectively transport ions between compartments, enabling the metal silicate dissolution process to occur separately while maintaining the necessary ionic balance in the electrolyte, thus simplifying the integration of abundant materials into the system.
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 system effectively reduces CO2 emissions by using low-CO2-emission electricity and lowers production costs by utilizing abundant metal silicates, while also avoiding the production of harmful chlorine gas.
Implementation Method 1
an electrolytic solution comprising a metal salt, the electrolytic solution disposed in said electrolytic container to undergo electrolysis when a direct current is applied
Implementation Method 2
means for supplying acidic solution from the anode region to said second container to effect dissolution of said solid metal silicate material and to generate a metal salt solution
Implementation Method 3
at least one ion-exchange membrane disposed in said electrolytic container between said anode and said cathode
Data Source
AI summary
An apparatus and method are provided for the electrochemical production of hydrogen, oxygen and metal hydroxide wherein the metal is derived from a metal silicate. The process involves the electrolysis of a metal salt solution where hydrogen and a metal hydroxide are produced at the cathode, and oxygen, or chlorine, and an acid are produced at the anode. The acid is reacted with a metal silicate producing a soluble metal salt and water that is used in turn to make solid or dissolved metal hydroxide. The net CO2 and acid gas emissions of the invention and its products may therefore be significantly reduced or turned negative.