Anionic Fluorinated Emulsifier Recovery via Two-Phase Elution
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Solution Overview
Problem
Current methods for recovering anionic fluorinated emulsifiers from basic ion exchange resins are inefficient and costly, requiring flammable and water-soluble organic solvents, and generate high chemical oxygen demand (COD) waste, necessitating a safer and more cost-effective recovery technique.
Innovation Solution
A method involving the use of a mixture of aqueous inorganic acid solutions and non-aqueous fluorinated media to elute and recover anionic fluorinated emulsifiers from basic ion exchange resins, avoiding the use of flammable solvents and enhancing recovery efficiency by separating the acid form of the emulsifier in a non-aqueous phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If water-soluble organic solvents (alcohols) are used to elute anionic fluorinated emulsifier from basic ion exchange resin, then the emulsifier can be recovered, but the process becomes unsafe due to flammability and requires complex waste treatment for high COD loads
Solution Approach 1:
The invention changes the chemical parameters of the elution system by replacing water-soluble organic solvents with a two-phase system consisting of water-immiscible organic solvent and aqueous alkali solution. This parameter change eliminates flammability concerns and reduces COD waste while maintaining effective emulsifier recovery through phase separation mechanisms.
Solution Approach 2:
The invention introduces an intermediary two-phase liquid system that mediates the elution process. The water-immiscible organic solvent phase and aqueous alkali solution phase work together to extract and transfer the anionic fluorinated emulsifier from the ion exchange resin, avoiding the need for flammable solvents while enabling efficient recovery.
2Ease of operation
If conventional elution methods using aqueous solutions are used, then the process is simple to operate, but the recovery efficiency and purity of the emulsifier are insufficient
Solution Approach 1:
The invention segments the elution process into two distinct liquid phases: a water-immiscible organic solvent phase and an aqueous alkali solution phase. This segmentation allows the emulsifier to be selectively extracted into one phase while the other phase handles the ion exchange reaction, thereby improving both operational simplicity and recovery purity through phase-specific functionality.
Solution Approach 2:
The invention creates a copied separation mechanism where the two-phase system replicates the selective extraction function in a simplified manner. The water-immiscible organic solvent phase copies the extraction capability while the aqueous phase maintains the ion exchange function, achieving high purity recovery without complex procedures.
3Reliability
If expensive anionic fluorinated emulsifier is used in emulsion polymerization, then high-performance fluoropolymer products can be produced, but the cost increases and environmental concerns arise from difficult decomposition
Solution Approach 1:
The invention implements a discarding and recovering system where the anionic fluorinated emulsifier, after performing its function in emulsion polymerization, is captured from waste streams via ion exchange resin and then eluted using the two-phase liquid system. This allows the expensive emulsifier to be recovered and reused, reducing both cost and environmental impact while maintaining polymerization performance.
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
This method efficiently recovers anionic fluorinated emulsifiers without using flammable solvents, reduces waste treatment complexity, and allows for the reuse of the non-aqueous medium, improving safety and reducing COD loads.
Implementation Method 1
a method of bringing a liquid to be treated containing the anionic fluorinated emulsifier into contact with a basic ion exchange resin, so that the anionic fluorinated emulsifier in the liquid to be treated is adsorbed on the basic ion exchange resin
Implementation Method 2
the basic ion exchange resin is brought into contact with a mixture of an aqueous inorganic acid solution and a non-aqueous fluorinated medium, a phase of the non-aqueous fluorinated medium is recovered, and the acid of the anionic fluorinated emulsifier is recovered from the phase of the non-aqueous fluorinated medium
Implementation Method 3
the basic ion exchange resin is brought into contact with a mixture of an aqueous inorganic acid solution and a non-aqueous fluorinated medium, a phase of the non-aqueous fluorinated medium is recovered, and the acid of the anionic fluorinated emulsifier is recovered from the phase of the non-aqueous fluorinated medium
Data Source
AI summary
To provide a method for recovering an anionic fluorinated emulsifier, capable of easily and efficiently recovering an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin. A basic ion exchange resin is brought into contact with a mixture of an aqueous inorganic acid solution and a non-aqueous fluorinated medium, or the basic ion exchange resin is brought into contact with an aqueous inorganic acid solution and then brought into contact with a non-aqueous fluorinated medium, then a phase of the non-aqueous fluorinated medium is recovered, and an acid of the anionic fluorinated emulsifier is recovered from the phase of the non-aqueous fluorinated medium.