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Polyamide reverse osmose membrane and production thereof

A technology of reverse osmosis membrane and polyamide, which is applied in the field of polyamide reverse osmosis membrane and its preparation, can solve the problems of insufficient NaCl removal rate and other problems, and achieve the effects of convenient operation, wide application range and wide source

Active Publication Date: 2006-08-16
凯膜特种分离技术(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned improved polyamide reverse osmosis membrane still has defects in the treatment of solutions with relatively high concentrations. In order to further improve the selective desalination of polyamide reverse osmosis membranes, CN 90103937.3 provides a method for improving the salt penetration of polyamide reverse osmosis membranes. A high-efficiency method, which includes soaking the polyamide reverse osmosis membrane with an alkali metal permanganate aqueous solution, and then re-treating the soaked reverse osmosis membrane with sodium sulfite or hydrogen peroxide solution
Although the desalination rate of the reverse osmosis membrane treated by this method has been improved, it is still not sufficient. Under the operating pressure of 300psi, at 25-32°C, the concentration of NaCl is 50-250g / L, SO 4 2- When the concentration is 5-60g / L and the pH is 7-11 mixed brine, the NaCl removal rate is less than 8%, and the SO removal rate cannot be achieved. 4 2- rate greater than 95%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] At room temperature, the polysulfone porous support with a thickness of 0.04 μm, including the non-woven fabric of the liner, is completely impregnated in a mixture containing m-phenylenediamine and 2,4-diaminobenzenesulfonic acid at a ratio of 5:1 (by weight). In the aqueous phase solution, the total concentration of the sum of the m-phenylenediamine and the 2,4-diaminobenzenesulfonic acid in the aqueous phase solution is 2.4% by weight. After forming a liquid layer on the porous carrier, Remove the excess aqueous phase solution on the porous carrier, and then contact the single side of the porous carrier containing the liquid layer with the n-hexane solution containing isophthaloyl chloride and trimesoyl chloride in a ratio of 1:5 (by weight) , carry out interfacial polymerization reaction, the total concentration of the sum of isophthaloyl chloride and trimesoyl chloride in the organic phase solution is 0.15% by weight, then remove the excess organic phase solution on...

Embodiment 2-13

[0042] In embodiment 2-13, change the proportional relationship between the aqueous phase solution mesophenylenediamine and 2,4-diaminobenzenesulfonic acid, the concentration of the aqueous phase solution, the organic phase solution isophthaloyl dichloride and trimes The proportional relationship between acid chlorides, the concentration of the organic phase solution, the composition of the treated brine solution, the pH value of the solution and the operating conditions for evaluating the performance of the prepared reverse osmosis membrane; Non-woven fabric, polyamide porous support with a thickness of 0.03 μm. The porous carrier used in Example 12 is a polyamide porous carrier comprising a liner non-woven fabric with a thickness of 0.03 μm; the porous support used in Example 13 is a polypropylene material comprising a liner non-woven fabric with a thickness of 0.04 μm. Dilute porous carrier, the results are shown in the table below.

[0043] As can be seen from the example...

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PUM

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Abstract

A reverse-osmosis polyamide member is prepared through providing the aqueous solution of lentine and 2.4-diamino phenylsulfonic acid, immersing the porous carrier in it to have a liquid layer on it, and single-surface contacting with the organic solution of isophthalic dichlorid and symphenyl triformyl chloride for interface polymerizing reaction. Said reverse osmosis membrane can be used to treat the saline for removing either impurity (SO4 ions) or NaCl in different condition, having high selectivity.

Description

technical field [0001] The invention relates to an interfacially synthesized polyamide reverse osmosis membrane with special selective separation and a preparation method thereof. technical background [0002] Selective membranes are often used to purify various solutions with different compositions and concentrations, such as nanofiltration membranes and reverse osmosis membranes. Nanofiltration membrane is also called loose reverse osmosis membrane. When nanofiltration membranes treat solutions of ions with different valence states, due to the DONNAN effect, the selectivity of nanofiltration membranes to different ions is different, so the ratio of different ions passing through nanofiltration membranes is also different, so as to separate different ions the goal of. [0003] However, the treatment such as NaCl concentration of 50-250g / L, SO 4 2- When the concentration of mixed brine is 5-60g / L, the Donnan effect due to the charge in the brine can no longer play a majo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/10
Inventor 李国新
Owner 凯膜特种分离技术(上海)有限公司
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