Preparation method of reverse osmosis membrane

Abstract

The invention belongs to the technical field of reverse osmosis composite membrane separation, and particularly relates to a preparation method of a reverse osmosis membrane which is free of color andfoam in produced water, high in desalination rate and large in produced water flux. The method comprises the following steps: firstly, coating the surface of a polysulfone porous support membrane with a layer of aqueous solution containing water-soluble macromolecules, removing liquid, then coating the surface of the membrane with a layer of aqueous phase solution containing polyamine, removing liquid again, then coating the surface of the membrane with a layer of oil phase solution containing polyacyl chloride, and then carrying out heat treatment and drying at a certain temperature; rinsingthe reverse osmosis membrane subjected to heat treatment drying in pure water at a certain temperature to remove residual polyamine monomers in the membrane; and finally, carrying out secondary heattreatment and drying to obtain the final reverse osmosis membrane. Compared with the prior art, the method disclosed by the invention has the advantages of simple membrane preparation process, easiness in operation, mild and simple membrane rinsing conditions, low content of residual polyamine in the membrane, no color and foam of the produced water, high desalination rate, high flux of the produced water and particularly good application prospect in the field of household water purification.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis composite membrane separation, in particular to a method for preparing a reverse osmosis membrane with colorless and foam-free produced water, high desalination rate and large produced water flux. Background technique [0002] Reverse osmosis membrane separation technology is a new membrane separation technology developed in the 1960s. It has the advantages of high separation efficiency and low energy consumption. It is widely used in the field of water, food and drug separation. At present, the most successful commercialized reverse osmosis membrane, its functional separation layer is an ultra-thin polyamide layer obtained on the surface of porous support layers such as polysulfone and polyethersulfone through interfacial polymerization of polyamines and polyacyl chlorides. [0003] In order to improve the performance of reverse osmosis membranes (such as desalination rate and water yiel...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of reverse osmosis membrane, which solves the problem of yellowing, browning and foaming in the produced water of reverse osmosis membrane in the prior art, and also solves the problem of high residual amine content in the membrane , and the membrane has a high desalination rate and a large water flux