Aqueous BIT Dispersion via pH-Driven Salt Precipitation
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Solution Overview
Problem
Existing methods for creating stable aqueous dispersions of 1,2-Benzisothiazolin-3-one (BIT) require mechanical processes like milling to achieve small particle sizes, which is undesirable and inefficient.
Innovation Solution
A method involving the formation of an aqueous mixture with a base and thickener, followed by the addition of acid, to create a stable dispersion with BIT particles of 75 microns or smaller without the need for milling, utilizing a process that forms a dissolved salt of BIT and maintains stability at various BIT concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If mechanical milling is used to reduce BIT particle size, then particle size is reduced, but process complexity and energy consumption increase
Solution Approach 1:
The patent replaces mechanical milling with a chemical process involving base treatment to form soluble salts, followed by acidification to precipitate fine particles. This substitution eliminates the need for mechanical size reduction equipment and complex milling operations while achieving the desired particle size distribution.
Solution Approach 2:
The patent changes the chemical state of BIT by converting it to a soluble salt form through base treatment, then reverses the process through acidification. This parameter change (chemical form transformation) enables particle size control without mechanical intervention, resolving the contradiction between particle size reduction and process simplification.
2Length of moving object
If mechanical milling is used to reduce BIT particle size, then particle size is reduced, but energy consumption increases
Solution Approach 1:
The patent replaces energy-intensive mechanical milling with a chemical transformation process that requires minimal energy input. The base treatment and acidification steps consume significantly less energy compared to continuous mechanical size reduction, while achieving the same particle size outcome.
Solution Approach 2:
The patent utilizes phase transitions of BIT between solid, soluble salt, and precipitated solid forms. These natural phase changes driven by pH adjustment require minimal energy input compared to mechanical force, thereby reducing energy consumption while controlling particle size.
3Stability of the object's composition
If BIT is dispersed in water at low pH, then solubility is poor requiring dispersion, but particle size control becomes difficult without milling
Solution Approach 1:
The patent introduces base and acid as intermediary substances to facilitate particle size control. The base converts BIT to a soluble intermediate form, and the acid precipitates fine particles. These intermediaries enable particle size control without direct mechanical action, maintaining dispersion stability while achieving small particle sizes.
Solution Approach 2:
The patent changes the pH parameter to control the solubility and particle size of BIT. By adjusting pH through base and acid addition, the system transitions between dissolved and precipitated states, enabling particle size control and stable dispersion formation without mechanical milling.
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 produces a stable aqueous dispersion with small BIT particle sizes, achieving desired viscosity and stability without mechanical processing, allowing for effective control of microorganisms in aqueous compositions.
Implementation Method 1
forming a dissolved salt of BIT
Implementation Method 2
said dispersion comprises (A) one or more thickener
Implementation Method 3
followed by the addition of acid, to create a stable dispersion with BIT particles
Data Source
AI summary
There is provided a method of making an aqueous dispersion wherein said dispersion comprises (A) one or more thickener and (B) solid particles of 1,2-benzisothiazolin-3-one, wherein said method comprises the steps of (a) forming an aqueous mixture (I) comprising water, a dissolved salt of 1,2-benzisothiazolin-3-one, and optionally one or more thickener, wherein the pH of said aqueous mixture (I) is 8.5 or higher, and (b) subsequently forming said aqueous dispersion by mixing together, in any order, components, wherein said components comprise an acid, said aqueous mixture (I), and optionally one or more thickener, wherein the pH of said dispersion is 1.5 to 7.5. Also provided is an aqueous dispersion made by that method.