Dye-Filled PVA Soluble Container for Complete Cyanide Solution Dissolution
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Solution Overview
Problem
Existing water-soluble containers based on polyvinyl alcohols are not suitable for use in aqueous solvents with low temperatures, high hardness, or salinity, leading to incomplete or slow dissolution, and there is a need for a means to distinguish between weak and strong alkali metal cyanide solutions without additional storage requirements.
Innovation Solution
A water-soluble container made of a polymer composition comprising polyvinyl alcohol copolymers with specific hydrolysis degrees and comonomer contents, designed to dissolve quickly and completely in challenging conditions, allowing differentiation between weak and strong alkali metal cyanide solutions by adding a dye or dye composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional polyvinyl alcohol containers are used in aqueous solvents with low temperatures, high hardness, or salinity, then the containers cannot dissolve quickly enough or can only dissolve incompletely, but changing the polymer composition to achieve fast dissolution in challenging conditions requires specific copolymer formulations with controlled hydrolysis degrees and comonomer contents
Solution Approach 1:
The patent applies parameter changes by precisely controlling the degree of hydrolysis (75-95 mol%) and comonomer content (10-20 wt%) of the polyvinyl alcohol copolymer. These parameter adjustments optimize the balance between dissolution speed and completeness, enabling the container to dissolve rapidly and completely even in challenging aqueous solvents with low temperatures, high hardness, or salinity.
Solution Approach 2:
The patent uses composite materials by formulating the container from a copolymer system comprising polyvinyl alcohol units combined with specific comonomers (acrylic acid, methacrylic acid, itaconic acid, or maleic acid). This composite polymer structure provides enhanced dissolution properties in challenging conditions while maintaining mechanical integrity and controlled disintegration.
2Ease of operation
If two batches of solid alkali metal cyanide are kept (one uncolored for weak solutions and one colored for stronger solutions), then the differentiation between solution strengths is possible, but the storage requirement and capital commitment increase correspondingly
Solution Approach 1:
The patent applies preliminary action by pre-filling water-soluble containers with dyes or dye compositions before use. These pre-prepared containers are stored separately from the alkali metal cyanide, allowing the differentiation function to be activated only when needed during the dissolution process, avoiding the need for continuous storage of multiple cyanide batches.
Solution Approach 2:
The patent segments the differentiation function into a separate modular component (the dye-filled water-soluble container) that can be added to the cyanide solution as needed. This segmentation allows the cyanide to be stored in a single batch while the coloring/differentiation capability is provided by a separate, on-demand additive system.
3Speed
If the wall thickness of the water-soluble container is increased to improve mechanical stability, then the dissolution time increases and completeness may be compromised, but if the wall thickness is decreased for faster dissolution, then mechanical stability during handling and storage is reduced
Solution Approach 1:
The patent optimizes the wall thickness parameter to a specific range (5-50 μm) that balances mechanical stability during handling and storage with rapid and complete dissolution in aqueous solvents. This parameter optimization ensures the container maintains sufficient strength for practical use while dissolving quickly and completely under application conditions.
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 container ensures almost complete dissolution within a reasonable timeframe even under adverse conditions, enabling the production of both colorless and colored alkali metal cyanide solutions from the same batch, without requiring separate storage for different solutions.
Implementation Method 1
the water-soluble container comprises or consists of a water-soluble polymer composition, wherein the polymer composition comprises: a) at least one polyvinyl alcohol copolymer P1 with a degree of hydrolysis in the range of 75 to 95 mol%
Implementation Method 2
The container ensures almost complete dissolution within a reasonable timeframe even under adverse conditions
Data Source
AI summary
The invention relates to a water soluble container which is suitable for receiving an additive substance or a additive substance composition and is filled with an additive substance or an additive substance composition comprising at least one dye or at least one dye composition, wherein the water soluble container has a wall thickness in the range from 5 to 50 pm, and wherein the water soluble container comprises a water soluble polymer composition or consists of a water soluble polymer composition, which comprises: • a) at least one polyvinyl alcohol copolymer Pl having a degree of hydrolysis in the range from 75 to 95 Mol%, and/or • b) at least one polyvinyl alcohol P2 having a degree of hydrolysis in the range from 87 to 95 Mol%.