Membrane chromatography filter membrane for removing charged ions in liquid and preparation method of membrane chromatography filter membrane

By designing a three-layer composite membrane chromatography filter, the problem of traditional membrane materials being unable to remove anions and cations simultaneously has been solved, achieving efficient and low-energy integrated filtration of ions and particulate impurities, suitable for the processing of high-purity chemicals in the electronics industry.

CN122076253AActive Publication Date: 2026-05-26HANGZHOU HEYU TECH CO LTD
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Patent Information

Application Number
CN202610560719.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2025-11-25
Filing Date
2026-04-27
Publication Date
2026-05-26
Estimated Expiration
2046-04-27

AI Technical Summary

Technical Problem

Existing technologies are unable to simultaneously and efficiently remove anions and cations from liquids, and traditional membrane materials have limitations in structural design and functional integration, leading to complex processes and increased equipment investment.

Method used

A membrane chromatography filter with a three-layer composite structure of positive-charged layer, neutral layer, and negative-charged layer was designed and prepared by three-layer die co-extrusion technology to achieve simultaneous adsorption of anions and cations, and to introduce a microporous structure in the neutral layer to filter particulate impurities.

Benefits of technology

It enables the simultaneous adsorption of anions and cations in a single filtration process, improving purification efficiency, reducing operating pressure and energy consumption, simplifying the process flow, and making it suitable for the processing of high-purity chemicals in the electronics industry.

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Abstract

The invention belongs to the field of wet electronic chemical purification, and particularly relates to a membrane chromatography filter membrane for removing charged ions in liquid and a preparation method thereof.The preparation method comprises the following steps that S1, membrane casting liquid is prepared, specifically, a positive electricity layer membrane casting liquid, a neutral layer membrane casting liquid and a negative electricity layer membrane casting liquid are prepared; s2, sequentially extruding the positive electricity layer membrane casting solution, the neutral layer membrane casting solution and the negative electricity layer membrane casting solution by using a three-layer die head, and coating on a polyester film; s3, exposing under the conditions of set temperature, humidity and air velocity, so that the casting membrane solution is subjected to preliminary phase splitting; s4, immersing the coated film in a pure water coagulating bath to complete phase splitting and curing; and S5, rinsing, drying and rolling to obtain the membrane chromatography filter membrane. By designing a special three-layer composite structure of'positive electricity layer-neutral layer-negative electricity layer ', the filter membrane can simultaneously adsorb anions and cations in a solution in a single filtering process, the limitation that a traditional single charge membrane can only remove one kind of ions is solved, and the purification efficiency is improved.
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