A polyamide reverse osmosis membrane and its application in the field of seawater desalination

Abstract

The invention provides a polyamide reverse osmosis membrane material, which improves the hydrophilicity and anti-pollution ability of the polyamide reverse osmosis membrane material by hydrophilically modifying the supporting membrane material of the reverse osmosis membrane material, and can be used in seawater desalination field has great application potential.

Description

technical field [0001] The application relates to an organic membrane, in particular to a hydrophilic polyamide reverse osmosis membrane with large flux and its application in the field of seawater desalination. Background technique [0002] Reverse osmosis composite membranes have excellent separation properties for small organic molecules and inorganic salt ions, and are widely used in seawater brackish water desalination, water purification, sewage reuse and other fields, and are of great significance to the utilization and protection of the earth's limited water resources. At present, the mainstream polyamide reverse osmosis membrane preparation method is the interfacial polymerization method. First, a layer of aqueous phase solution containing a certain proportion of m-phenylenediamine (MPD) is evenly spread on the surface of the supporting membrane as the supporting layer, and the excess aqueous phase is removed. After the solution is poured into the membrane surface, ...

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that the particle size of hydrophilic molecular sieves, especially NaA molecular sieves, is generally larger than 1 μm, and their compatibility with polysulfone polymers is poor, so membrane defects are more likely to occur, thereby reducing the separation performance of the membrane.