Polyamide hollow fiber membrane, hollow fiber membrane module, and method for producing a polyamide hollow fiber membrane
Polyamide hollow fiber membranes with reduced metal content and optimized manufacturing processes address the issue of performance degradation during storage, ensuring stable filtration performance over extended periods.
JP2026109616APending Publication Date: 2026-07-01UNITIKA LTD
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- UNITIKA LTD
- Filing Date
- 2026-01-09
- Publication Date
- 2026-07-01
AI Technical Summary
Technical Problem
Polyamide hollow fiber membranes experience significant changes in filtration performance when stored in preservation solutions for extended periods due to the presence of specific metal elements, leading to reduced storage stability.
Method used
The development of polyamide hollow fiber membranes with reduced content of Fe, Cr, Cu, Mg, and Zn, combined with specific manufacturing processes to minimize contamination, ensures stable filtration performance over time.
Benefits of technology
The membranes maintain filtration performance without significant changes even after long-term storage, exhibiting excellent storage stability and consistent filtration efficiency.
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Smart Images
Figure 2026109616000001_ABST
Abstract
The present invention aims to provide a polyamide hollow fiber membrane, a hollow fiber membrane module, and a method for producing a polyamide hollow fiber membrane, which maintain filtration performance even after long-term storage in a preservation solution. [Solution] The polyamide hollow fiber membrane of the present invention is formed from a polyamide resin and satisfies at least one of the following features (1) to (5). (1) Fe content is 4.30 ppm or less (2) Cr content is less than 1.00 ppm (3) Cu content is less than 0.20 ppm (4) Mg content is less than 0.60 ppm (5) Zn content is less than 0.30 ppm
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