Chelating Membrane for Wet Electronic Chemical Purification
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Solution Overview
Problem
Traditional methods for purifying ultra-clean and high-purity reagents for electronic chemicals, such as distillation and rectification, have low removal rates for metal ions and high energy consumption.
Innovation Solution
A preparation method for a chelating membrane that involves hydrophilic treatment of a porous PTFE membrane, cleaning and drying of a chelating resin, grinding and sieving to obtain a powder, mixing with polyisobutylene and polyhexafluoroethylene emulsion, and coating the membrane to create a chelating membrane with high removal efficiency for trace metal ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional distillation and rectification methods are used to purify ultra-clean and high-purity reagents, then the purification process can be performed, but the removal rate of metal ions is low and energy consumption is high
Solution Approach 1:
The patent uses a porous PTFE membrane as the base membrane structure, which provides high porosity (50-80%) for efficient mass transfer and ion removal. The porous structure allows reagents to pass through while enabling chelating resin particles to capture metal ions effectively, achieving high removal rates without requiring energy-intensive distillation processes.
Solution Approach 2:
The patent creates a composite membrane by combining PTFE base membrane with chelating resin particles (such as iminodiacetic acid chelating resin). This composite structure integrates the hydrophobicity and chemical stability of PTFE with the metal ion chelating capability of the resin, achieving both high purification efficiency and low energy consumption in a single membrane system.
2Reliability
If traditional distillation and rectification methods are used to purify ultra-clean and high-purity reagents, then the purification process can be performed, but the energy consumption is high
Solution Approach 1:
The patent replaces the thermal field-based distillation and rectification processes with a membrane separation system operating at ambient or mild temperatures. The chelating membrane uses chemical chelation mechanisms rather than thermal evaporation, dramatically reducing energy consumption while maintaining high purification effectiveness for metal ion removal.
Solution Approach 2:
The patent changes the operating parameters from high-temperature distillation conditions to ambient temperature membrane filtration. By operating at lower temperatures with optimized flow rates and pressure differentials, the system achieves equivalent or superior purification effectiveness with significantly reduced energy consumption.
3Stability of the object's composition
If a porous PTFE membrane is used as base membrane, then chemical stability and hydrophobicity are achieved, but hydrophilicity is insufficient for aqueous solution processing
Solution Approach 1:
The patent applies local quality modification by coating only the surface of the hydrophobic PTFE membrane with hydrophilic materials (such as polyethylene glycol or silane-based coatings). This creates a dual-layer structure where the bulk PTFE maintains chemical stability and hydrophobicity, while the surface coating provides hydrophilicity for aqueous solution processing.
Solution Approach 2:
The patent creates a composite membrane structure combining hydrophobic PTFE base material with hydrophilic coating layers. This composite approach allows the membrane to simultaneously exhibit chemical stability from the PTFE matrix and hydrophilic properties from the surface coating, enabling effective processing of aqueous electronic chemicals.
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 chelating membrane achieves a high removal rate of trace metal ions with low energy consumption, compared to traditional methods, and is cost-effective with simple operation, making it suitable for high-purity electronic chemical purification.
Implementation Method 1
performing hydrophilic treatment on a porous PTFE membrane to obtain a hydrophilic base membrane
Implementation Method 2
a chelating membrane for purifying wet electronic chemicals... has a high removal rate of trace metal ions
Data Source
AI summary
Disclosed in the present disclosure is a preparation method for a chelating membrane for purifying wet electronic chemicals, including the following steps: performing hydrophilic treatment on a porous PTFE membrane to obtain a hydrophilic base membrane; sequentially cleaning a chelating resin with a hydrochloric acid solution, a sodium hydroxide solution and deionized water, and then drying; grinding and sieving the cleaned and dried chelating resin to obtain a powder; mixing the powder with polyisobutylene and a polyhexafluoroethylene emulsion, and performing vacuum defoaming to form a membrane coating solution; coating the hydrophilic base membrane with the membrane coating solution to prepare a chelating membrane; and sequentially washing the chelating membrane with a hydrochloric acid solution, a sodium hydroxide solution and pure water until the chelating membrane is neutral, and then drying and storing the chelating membrane.