Oxidation resistant compound reverse osmosis membrane

A reverse osmosis membrane and oxidation-resistant technology, which is applied in the field of water treatment, can solve the problems of reducing membrane operating efficiency, increasing operating costs, and short service life of reverse osmosis membranes, so as to improve oxidation resistance and organic pollution resistance. Chlorine performance and anti-pollution performance are strong and the cleaning interval is long

Active Publication Date: 2008-02-27
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the process of purifying water, the reverse osmosis membrane will also be polluted by some organic or inorganic substances in the water, such as inorganic ions, bacteria, viruses, organic substances and colloids in raw water will be adsorbed on the reverse osmosis membrane, resulting in colloidal particles Pollution and Biochemical Contamination
Reduce the water flux of the reverse osmosis membrane; in addition, the ordinary polyamide reverse osmosis membrane is very sensitive to chlorine, and a very low concentration of chlorine will destroy the performance of the membrane, causing the membrane to lose the desalination rate in a short time
Most of the current water sources are polluted, and some are treated waste water. The water source contains a large amount of oxidizing fungicides. Therefore, the existing reverse osmosis membrane has a short service life and needs to be replaced frequently, which increases the operating cost. , which also reduces the operating efficiency of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0018] A porous polysulfone support membrane composed of a DMF solution containing 16% polysulfone was used and placed in a 2.5% m-phenylenediamine (MPDA) solution for about 1 minute. The amine solutions each contained 0.1 wt% sodium dodecylsulfonate (SDBS) surfactant. The support film soaked in MIPA was placed on a paper towel and rolled with a rubber roller to remove excess solution on the front and back. The above steps and the amount of polyamine used are the same as those in the prior art for preparing the polyamide layer. This support layer was then contacted with an organic solution of acid chloride (-COCl) listed in Table 1 containing 0.1% (wt / v%) for 50 seconds, and then placed in a 40°C oven for 10 minutes to form a polyamide layer. After taking it out, use a potassium persulfate solution with a concentration of 1%, and treat it for 30 minutes when the pH of the potassium phosphate buffer solution is 8. Then keep it in an oven at 140° C. for 5 minutes to obtain the...

Embodiment 7

[0024] Except that 2-iodo-terephthaloyl chloride was used instead of 5-iodo-isophthaloyl chloride, a composite reverse osmosis membrane was prepared by the same operation as in Example 4. Then using the same test method as in Example 4, the initial desalination rate of the membrane was 99.1%, and the water flux was 25.3GFD. After NaClO oxidation treatment, the desalination rate was 98.5%, and the water flux was 33.4GFD.

Embodiment 8

[0026] Except that 5-bromo-isophthaloyl chloride was used instead of 5-iodo-isophthaloyl chloride, the same operation as in Example 4 was used to prepare a composite reverse osmosis membrane. Then using the same test method as in Example 4, the initial desalination rate of the membrane was 98.7%, and the water flux was 22.8GFD. After NaClO oxidation treatment, the desalination rate was 97.0%, and the water flux was 34.4GFD.

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PUM

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Abstract

The invention discloses an oxidation resistant composite reverse osmosis film, which comprises the following parts: nonwoven fabrics and polysulfone support layer, wherein the polyamide layer prepared by acyl chloride organic solution constituted by polyamine and modified polyacylchloride solution or polyamine and pyromellitic triformyl chloride and modified polyacylchloride on the polysulfone support layer. The invention improves the oxidization proof property and organic pollution proof property of the reverse osmosis film to lengthen the using life of the reverse osmosis film, which has easy preparation and operation, high desalinization rate and large water flux, therefore fitting for water disposing course in wider domain to expand the application of the reverse osmosis film.

Description

technical field [0001] The invention belongs to the field of water treatment, in particular to a reverse osmosis membrane used for water treatment. Background technique [0002] Reverse osmosis technology is a separation method that separates the solute and the solvent in the solution by means of the selective interception of the reverse osmosis membrane under a certain pressure. It is widely used in sewage treatment and liquid purification and concentration, the most common of which is The application is in the water treatment process, using reverse osmosis technology to remove impurities such as inorganic ions, bacteria, viruses, organic matter and colloids in raw water to obtain high-quality pure water. However, during the process of purifying water, the reverse osmosis membrane will also be polluted by some organic or inorganic substances in the water, such as inorganic ions, bacteria, viruses, organic substances and colloids in raw water will be adsorbed on the reverse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D71/68
CPCB01D2325/28B01D69/02B01D71/56B01D69/125B01D2325/30B01D67/0093
Inventor 赵小阳何耀华吴宗策蔡志奇王思亮龙昌宇刘枫
Owner VONTRON TECH CO LTD
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