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Method for repairing reverse osmosis membrane defects

A reverse osmosis membrane and repair method technology, applied in the field of preparation of separation membrane materials, can solve the problems of reducing membrane water flux and increasing water permeation membrane resistance

Inactive Publication Date: 2021-03-12
安徽昂可特膜科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another U.S. patent 3877978 uses vinyl acetate as a repair agent. Due to its non-selectivity to defect repair, although it can repair defects and improve the desalination rate, the surface of the membrane is also coated with a layer of this substance to increase water penetration through the membrane. resistance, reducing the membrane water flux

Method used

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  • Method for repairing reverse osmosis membrane defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Select 4040 roll-type reverse osmosis membrane elements with a desalination rate of 85.5%, see Table 1. 0.1% rhodamine B aqueous solution, temperature is 80 ° C, 1.0Mpa pressure, 95% recovery rate, 10 liters of concentrated water per minute, After 30 minutes of circulation, the measured desalination rate of NaCl increased from 87.5% to 97.2%.

Embodiment 2

[0017] Example 2: Other conditions are the same as in Example 1, the concentration of rhodamine B is 0.1%, and the concentration of isopropanol is 5%. Run time 30 minutes. The results of desalination rate before and after restoration are shown in Table 1.

Embodiment 3-10

[0018] Embodiment 3-10: Other conditions are the same as in Embodiment 1, and the restoration conditions and results are shown in Table 1.

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Abstract

The invention discloses a method for repairing reverse osmosis membrane defects. Particularly, the polyamide reverse osmosis composite membrane element takes aqueous solutions containing dyes and auxiliaries with different concentrations as raw water, circularly operates for a certain time under the conditions of certain pressure, temperature and recovery rate, and utilizes the characteristic thatthe dyes preferentially dye a bottom membrane material of a composite membrane, the defect part of the polyamide is sealed, so that the desalination capacity is repaired.

Description

technical field [0001] The invention belongs to the technical field of preparation of separation membrane materials, and relates to a method for repairing defects of reverse osmosis membranes, in particular to a method for using water-soluble dyes to block defects of reverse osmosis membranes and improve the desalination capacity of the membranes. Background technique [0002] Energy and environmental issues, including water security, global warming and shrinking energy supplies, have been of great concern in recent years. So far, various technologies have been initially explored to obtain clean water, capture "greenhouse" gases, and find alternative energy sources. By solving some of the pressing problems mentioned above, membrane separation has become one of the most important technologies. Membrane separation technology is becoming more and more important in the separation industry and can be applied to the separation of various molecular weight components in the gas pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D61/02B01D69/00B01D69/06C02F1/44C02F101/30C02F101/34C02F101/38
CPCB01D61/025B01D65/02B01D69/00B01D69/06C02F1/441B01D2321/168B01D2311/18B01D2311/14B01D2311/10C02F2101/308C02F2101/38C02F2101/34Y02A20/131
Inventor 武少禹刘星
Owner 安徽昂可特膜科技有限公司