Weakly Acidic Hypochlorous Acid Production via Controlled Ion Exchange
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Solution Overview
Problem
The existing ion exchange method for producing weakly acidic hypochlorous acid aqueous solutions has limitations in storage stability due to decomposition of hypochlorous acid when in contact with acidic ion exchange resins and metal ions, requiring immediate use and restrictive conditions.
Innovation Solution
A method involving an ion exchange step with a specific ratio of acidic ion exchange resin to raw material aqueous solution, controlled temperature, and mixing time to minimize decomposition, followed by separation to achieve a stable pH range and reduced metal ion concentration, ensuring the solution's storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ion exchange method is used to produce weakly acidic hypochlorous acid aqueous solution, then the ease of manufacture is improved, but the storage stability deteriorates due to decomposition of hypochlorous acid
Solution Approach 1:
The patent optimizes specific parameters including the ratio of acidic ion exchange resin to raw material solution (0.05-0.5), temperature (5-40°C), and mixing time (10-120 minutes) to minimize hypochlorous acid decomposition while maintaining ease of manufacture through the ion exchange method
2Reliability
If the acidic ion exchange resin is used to lower pH, then the bactericidal effect is improved, but the decomposition of hypochlorous acid is accelerated
Solution Approach 1:
The patent maintains pH in the optimal range of 3-6 through controlled ion exchange, ensuring high bactericidal effect while minimizing decomposition. The specific parameter optimization includes resin-to-solution ratio and contact time to achieve the desired pH without excessive decomposition
Solution Approach 2:
The patent minimizes the contact time between hypochlorous acid and acidic ion exchange resin by optimizing mixing time (10-120 minutes), allowing the necessary pH adjustment to occur rapidly while limiting the duration that promotes decomposition
3Stability of the object's composition
If the ion exchange step is extended to reduce metal ion concentration, then the storage stability is improved, but the productivity decreases
Solution Approach 1:
The patent optimizes mixing time within 10-120 minutes based on the resin-to-solution ratio, achieving sufficient metal ion removal and storage stability without excessive processing time that would reduce productivity
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 method efficiently produces a weakly acidic hypochlorous acid aqueous solution with improved storage stability by reducing decomposition and maintaining effective chlorine concentration, suitable for disinfection and sterilization applications.
Implementation Method 1
an ion exchange step (A) of mixing a raw material aqueous solution containing an aqueous solution of metal salt of hypochlorous acid with an acidic ion exchange resin and performing ion exchange between a metal ion and a hydrogen ion to produce molecular hypochlorous acid dissolved in a mixed solution
Data Source
AI summary
A method for producing a weakly acidic hypochlorous acid aqueous solution comprises (A) an ion-exchange step for generating molecular hypochlorous acid dissolved in a mixed solution by mixing a raw material aqueous solution composed of an aqueous solution of a metal salt of hypochlorous acid with an acidic ion-exchange resin to perform ion exchange between the metal ions and the hydrogen ions, and (B) a separation step for separating the acidic ion-exchange resin from the mixed solution after the ion-exchange step and obtaining weakly acidic hypochlorous acid aqueous solution in which molecular hypochlorous acid is dissolved.