Hollow fibrous reverse osmosis composite membrane and preparation method thereof

Abstract

The invention relates to a hollow fibrous reverse osmosis composite membrane, which comprises more than ten abreast-arranged hollow fibrous membrane tubes, wherein the outer walls of the two ends of each hollow fibrous membrane tube are in sealing connection; the molecular weight cut-off of the fibrous membrane tubes is 15,000 to 30,000; the inner diameter of each fibrous membrane tube is 0.8 t 1.0 mm, while wall thickness is 0.5 to 0.7 mm; and the inner hole wall of each fibrous membrane tube is provided with a 3 to 100 nm thick active polyamide layer produced by polyreaction. As the surfaceof the inner hole wall of each hollow fibrous membrane tube is connected with a functional separation layer through interface polymerization, the hollow fibrous reverse osmosis composite membrane hasthe characteristics of high contamination resistance, durable and stable flux, relatively simpler production process and low production cost, and can be used for the desalination of sea water, the preparation of ultra-pure water, and the treatment and the like of surface water and some special wastewater.

Description

technical field [0001] The invention relates to a hollow fiber reverse osmosis composite membrane and a preparation method thereof, belonging to the technical field of reverse osmosis treatment for water treatment. Background technique [0002] Ultra-low pressure reverse osmosis is a membrane technology developed rapidly on the basis of nanofiltration in recent years. It is mainly used in seawater desalination and ultrapure water preparation. The ultra-low pressure reverse osmosis membrane improves the surface material and composition structure of the membrane surface, improves the performance of the membrane, and overcomes the shortcomings of reverse osmosis and nanofiltration. It can not only desalinate brackish water at a lower pressure, but also be used for Surface water and some special wastewater treatment, and large output, strong anti-pollution ability and anti-microbial impact ability, good mechanical strength, temperature resistance, stable performance. [0003] T...

AI Technical Summary

Problems solved by technology

At present, reverse osmosis composite membrane products at home and abroad are mainly limited to flat membranes and roll membranes. On the one hand, the membrane components made by using them are relatively large, which makes the structure of the processing equipment relatively large, which limits the application in some places.

On the other hand, due to the support layer on the flat membrane and roll membrane and the polymer attached to it, the polymer membrane may be detached under the reverse pressure difference, which reduces the reliability of liquid processing and also causes weak anti-pollution ability and the problem of concentration polarization at both ends

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