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Preparation method of high water flux reverse osmosis membrane

A technology of reverse osmosis membrane and flux, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problem of reverse osmosis membrane desalination rate of less than 99%, etc., and achieve low preparation cost and reproducibility. Good and high desalination effect

Inactive Publication Date: 2016-03-16
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above studies have improved the water flux of the reverse osmosis composite membrane to varying degrees by adjusting the interfacial polymerization or post-treatment methods, but sacrificed the salt rejection rate to a certain extent, and the salt rejection rate of some high-flux reverse osmosis membranes is even lower than to 99%

Method used

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  • Preparation method of high water flux reverse osmosis membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]0.5% of DMI was added to the aqueous phase solution containing 2% m-phenylenediamine, and this was used to replace the aqueous phase solution containing 2% m-phenylenediamine in Comparative Example. Other than that, all other conditions were the same as those of the comparative example. The water flux of the reverse osmosis composite membrane prepared by this method is 90.5LMH and the desalination rate is 99.4%.

Embodiment 2

[0036] 2% of DMI was added to the aqueous phase solution containing 2% m-phenylenediamine to replace the aqueous phase solution containing 2% m-phenylenediamine in Comparative Example. Other than that, all other conditions were the same as those of the comparative example. The water flux of the reverse osmosis composite membrane prepared by this method is 113.2LMH, and the desalination rate is 99.2%.

Embodiment 3

[0038] Add 0.1% DMI to the organic phase solution containing 0.1% trimesoyl chloride, and use it to replace the organic phase solution containing 0.1% trimesoyl chloride in the comparative example. Other than that, all other conditions were the same as those of the comparative example. The water flux of the reverse osmosis composite membrane prepared by this method is 102LMH, and the desalination rate is 99.3%.

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Abstract

The invention belongs to the technical field of reverse osmosis composite membrane, and specifically refers to a high water flux reverse osmosis membrane and a preparation method thereof. An interfacial reaction of an aqueous solution of aromatic polyamine with polybasic acyl chloride solution is carried out on a porous support film, wherein the aqueous phase or organic phase solution for interfacial polymerization is supplemented with a polar aprotic additive; and certain subsequent treatment is carried out. The present invention has the advantage that the provided a preparation method is simple, and low in operating pressure; and the prepared polyamide reverse osmosis composite membrane has high water flux without significant reduction in the rate of desalination. The high water flux polyamide composite reverse osmosis membrane of the present invention has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis composite membranes, and specifically refers to a high water flux reverse osmosis membrane and a preparation method thereof. technical background [0002] Reverse osmosis membrane separation technology is a new membrane separation technology developed in the 1960s. Its principle is to remove dissolved salts, colloids, microorganisms, Organic matter and other substances are effectively separated from water. In 1981, Cadotte et al. first invented the interfacial polycondensation method in US Patent 4,277,344 to prepare polyamide reverse osmosis composite membranes. Then, on the basis of the development of industrial roll-type membrane elements, reverse osmosis technology was used in seawater and brackish water desalination, wastewater treatment, and reclaimed water. It has been widely used in the fields of reuse, food and drug separation, and has achieved good economic and social benefits. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
CPCB01D71/56B01D67/0006B01D69/12
Inventor 岳鑫业林泽潘巧明
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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