Sulfur Dioxide Electrolyzer for Direct High-Concentration Sulfuric Acid
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Solution Overview
Problem
Existing sulfur dioxide electrolysis systems struggle to produce sulfuric acid concentrations above 50 wt% efficiently, requiring energy-intensive subsequent concentration steps and lacking control over output concentrations.
Innovation Solution
A sulfur dioxide electrolyzer system with controlled operational parameters, including temperature, water inclusion, differential pressure, and current density, enables production of sulfuric acid concentrations exceeding 60 wt% directly, eliminating the need for subsequent concentration steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional sulfur dioxide electrolysis systems operate to produce sulfuric acid, then sulfuric acid is generated, but the concentration cannot exceed 50 wt% efficiently and requires energy-intensive subsequent concentration steps
Solution Approach 1:
The patent applies parameter changes by optimizing operational parameters including temperature (60-200°C), pressure differential (0.1-50 barg), current density (0.1-5 A/cm²), and water-to-sulfur dioxide molar ratio (1:0.5 to 1:5) to achieve sulfuric acid concentrations exceeding 60 wt% directly during electrolysis, eliminating the need for subsequent energy-intensive concentration steps
2Quantity of substance
If conventional electrolysis systems produce sulfuric acid at low concentrations, then the electrolysis process is simple, but additional concentration steps are required increasing process complexity
Solution Approach 1:
The patent merges the electrolysis process with the concentration function by operating the electrolyzer under optimized conditions that simultaneously produce sulfuric acid at concentrations >60 wt%, eliminating the need for separate concentration units and reducing overall process complexity
Solution Approach 2:
The electrolyzer is designed to perform multiple functions: electrochemical conversion of sulfur dioxide to sulfuric acid, water management, and concentration control all within a single unit, making the system multi-functional and reducing the need for additional dedicated equipment
3Quantity of substance
If water is introduced to control sulfuric acid concentration, then concentration can be regulated, but water management becomes more complex
Solution Approach 1:
The patent implements feedback control by monitoring sulfuric acid concentration and adjusting water introduction rates accordingly, using control systems to regulate water-to-sulfur dioxide molar ratio and maintain target concentrations while simplifying operational complexity through automated regulation
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 achieves higher sulfuric acid concentrations, reducing energy consumption and operational costs while minimizing environmental impact by integrating directly with industrial processes.
Implementation Method 1
The electrolyzer facilitates and/or leverages the electrochemical oxidation of sulfur dioxide to sulfuric acid
Implementation Method 2
electrochemical reduction of water (e.g., protons) to hydrogen
Data Source
AI summary
A method can include: introducing sulfur dioxide in an anolyte flow path of an electrolyzer; optionally, introducing water in the catholyte flow path of the electrolyzer; operating the electrolyzer; optionally: processing the products; and optionally: using the products. In some variants of the method, the amount of water introduced can be balanced such as to achieve a target sulfuric acid concentration.