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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 problems such as insufficiency, and achieve the effects of convenient operation, stable performance and wide application

Inactive Publication Date: 2006-08-16
凯膜过滤技术(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] But the polyamide reverse osmosis membrane after above-mentioned improvement still has defective aspect the solution aspect processing concentration higher, in order to further improve the desalination rate of polyamide reverse osmosis membrane, CN 90103937.3 provides a kind of method that improves polyamide reverse osmosis membrane salt passing rate The method comprises soaking the polyamide reverse osmosis membrane with an alkali metal permanganate aqueous solution, and then treating the soaked reverse osmosis membrane again 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 28-32°C, the pH is 6-8, and the concentration of NaCl in the treatment is 50-250g / L, SO 4 2- When the concentration of brine is 5-60g / L, the NaCl removal rate is less than 8%, and the SO removal rate is less than 8%. 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 0.04 μm thick polysulfone porous support including the liner non-woven fabric is completely immersed in the aqueous phase solution containing m-phenylenediamine and piperazine, and quickly taken out, wherein the aqueous phase solution is m-phenylenediamine The concentration of amine is 1.0% by weight, the concentration of piperazine is 0.3% by weight, a liquid layer is formed on the porous carrier, excess aqueous phase solution is removed, and then the porous carrier containing the liquid layer is mixed with trimesoyl chloride-containing The isooctane organic phase solution is contacted on one side for 15-20 seconds to carry out interfacial polymerization reaction, the concentration of trimesoyl chloride is 0.1% by weight, and then the excess organic phase solution is removed. After the reaction is completed, the generated reverse osmosis membrane is air-dried indoors, then gently rinsed with deionized water, and then placed on a flat-panel test ...

Embodiment 2-13

[0042] In embodiment 2-13, change the concentration of described m-phenylenediamine and piperazine in aqueous phase solution, the concentration of trimesoyl chloride in described organic phase solution, the composition of processed saline solution, solution pH value and evaluation The operating conditions of the performance of the prepared reverse osmosis membrane; The porous carrier adopted in embodiment 4 is the polyimide porous carrier that comprises liner non-woven fabric, and thickness is 0.03 μ m; Adopted in embodiment 9 and 10 The porous carrier is a polypropylene porous carrier comprising a liner non-woven fabric with a thickness of 0.045 μm; the porous carrier used in Example 13 is a polyamide porous support comprising a liner non-woven fabric and a thickness of 0.03 μm, the results are as follows surface.

[0043] As can be seen from the examples in the table, the polyamide reverse osmosis membrane prepared by the present invention, under 300-370psi operating pressur...

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Abstract

A reverse-osmosis polyamide member is prepared through providing the aqueous solution of lentine and piperazine, immersing the porous carrier in it to have a liquid layer on it, and single-surface contacting with the organic solution of 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 membranes are also called loose reverse osmosis membranes. When nanofiltration membranes process solutions of ions with different valence states, due to the DONNAN effect, the selectivity of nanofiltration membranes to different ions is different, so different ions pass through nanofiltration membranes. The ratio is also different, so as to achieve the purpose of separating different ions. [0003] However, the treatment such as NaCl concentration of 50-250g / L, SO 4 2- When the concentration is the mixed brine of 5-60g / L, the Donnan effect due to the charge in the brine can no lo...

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 凯膜过滤技术(上海)有限公司
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