Fluoroalkene Storage with Metal Impurity Limits for Purity Retention
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Solution Overview
Problem
Fluoroalkenes with bromine or iodine atoms in the molecule are prone to decomposition and elimination reactions during storage, leading to reduced purity, and the addition of stabilizers to suppress these reactions further decreases their purity.
Innovation Solution
Storing fluoroalkene in a container with controlled metal impurity concentrations, specifically limiting manganese, cobalt, nickel, and silicon to 1000 ppb by mass or less, and optionally including sodium, potassium, magnesium, and calcium to 2000 ppb by mass or less, at temperatures between −20°C and 50°C, without the need for stabilizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stabilizers are added to suppress decomposition and elimination reactions, then stability is improved, but purity deteriorates
Solution Approach 1:
The patent extracts and removes stabilizer additives from the fluoroalkene composition, achieving stability through purification rather than addition. The method specifies storing fluoroalkene without adding stabilizers, thereby eliminating the purity deterioration caused by stabilizer presence while maintaining suppression of decomposition and elimination reactions through controlled storage conditions.
Solution Approach 2:
The patent changes the storage parameters by specifying controlled temperature ranges and purity thresholds for metal impurities. By controlling storage temperature and limiting metal impurity concentrations (e.g., manganese, cobalt, nickel, silicon to 1000 ppb or less), the patent achieves stability without requiring stabilizer additives, thus resolving the contradiction between stability improvement and purity maintenance.
2Reliability
If stabilizers are added to suppress reactions during storage, then reliability is improved, but purity deteriorates
Solution Approach 1:
The patent removes stabilizer additives from the system, achieving reliability through controlled storage conditions rather than chemical stabilization. By specifying storage without stabilizers and controlling metal impurity levels, the method ensures reliable suppression of reactions while maintaining high purity.
Solution Approach 2:
The patent establishes specific storage parameters including temperature control and metal impurity limits to ensure reliable storage without stabilizers. These parameter specifications provide a reliable framework for preventing reactions while preserving purity.
3Ease of manufacture
If metal impurities are present in fluoroalkene, then ease of manufacture is improved, but stability deteriorates
Solution Approach 1:
The patent sets specific parameter thresholds for metal impurity concentrations (e.g., manganese, cobalt, nickel, silicon at 1000 ppb or less) to balance manufacturing feasibility with stability requirements. This quantitative approach allows manufacturers to achieve acceptable stability while maintaining reasonable ease of manufacture through controlled purification.
Data Source
AI summary
There is provided a method for storing fluoroalkene in which, even when stabilizers for suppressing reactions of fluoroalkene are not added, the reactions of the fluoroalkene hardly occur and the purity of the fluoroalkene hardly decreases during storage. Fluoroalkene having a bromine atom or an iodine atom in the molecule is at least one type of fluoroethylene represented by a first general formula C2HpFqXr and fluoropropene represented by a second general formula C3H3FtXu (X represents a bromine atom or an iodine atom), and contains or does not contain at least one type among manganese, cobalt, nickel, and silicon as metal impurities. When any of the foregoing is contained, the fluoroalkene is stored in a container with the total concentration of the manganese, the cobalt, the nickel, and the silicon set to 1000 ppb by mass or less.