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Complex reverse osmosis membrane

A technology of reverse osmosis membrane and compound, applied in the field of water treatment, to achieve the effect of improving performance, improving compactness, reducing engineering investment and production cost

Inactive Publication Date: 2009-12-16
VONTRON MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] So far, there is no report on composite reverse osmosis membranes with three-dimensional cross-linking of membrane molecules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0035] A porous polysulfone support membrane composed of a DMF solution containing 16% polysulfone was used and placed in a 3.5% 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 MDPA 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 listed in Table 1 containing 0.15% (wt / v%) of acid chloride (-COCl) for 50 seconds to form a polyamide layer. Then keep it in an oven at 140° C. for 10 minutes to obtain the final composite reverse osmosis membrane.

[0036] Use an aqueous solution containing 32800ppm of sodium chloride, pH 7.5, and test under the condition of 800psi for 1 hour to obtain the initial performance of the memb...

Embodiment 7

[0041] Except that 2,2',4,4'-biphenyl tetracarbonyl chloride was used instead of 3,3',5,5'-biphenyl tetracarbonyl 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 99.80%, and the water flux was 19.3GFD. After running for 6 hours, the desalination rate was 99.75%, and the water flux was 19.0GFD.

Embodiment 8

[0043]Except that 3,3',5,5'-biphenyltetracarbonyl bromide was used instead of 3,3',5,5'-biphenyltetracarbonyl 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 99.78%, and the water flux was 19.9GFD. After running for 6 hours, the desalination rate was 99.72%, and the water flux was 19.2GFD.

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Abstract

The invention discloses a complex reverse osmosis membrane which comprises a non-woven fabric layer and a polysulfone supporting layer, wherein a crosslinked polyamide layer which uses polyamine and an organic solution containing an acyl halide compound for interfacial synthesis is arranged on the polysulfone supporting layer. In the invention, the polyamine and the organic solution containing the acyl halide are adopted on the polysulfone supporting layer of the prior reverse osmosis membrane to obtain the polyamide layer with a three-dimensional crosslinked structure through interfacial condensation, thus the performance of the complex reverse osmosis membrane is further improved, and the membrane molecules have better compactness and stronger rigidness, wherein the improved compactness can improve the salt rejection rate of the membrane, and the improved rigidness can enable the membrane to have excellent anti-densification performance, thus the rate of decay of the performance of the membrane can be reduced, and the service life of the membrane can be prolonged. Therefore, the complex reverse osmosis membrane has the advantages of high salt rejection rate, large water flux, long service life and obvious reduction of engineering investment and production cost, and can be widely applied to the fields of electricity, metallurgy, petroleum and petrochemical industry, medicine, food, municipal engineering, seawater desalination, and the like.

Description

technical field [0001] The invention relates to a composite reverse osmosis membrane that can be used in the fields of seawater desalination and the like, and belongs to the technical field of water treatment. Background technique [0002] The daily output of desalination of seawater and brackish water containing inorganic salts in the world has reached 27 million tons, and is still increasing at a rate of 10% to 30%. Membrane treatment of salt water desalination has the advantages of less energy consumption, low investment, high recovery rate, small footprint, high salt removal rate, stable water quality, etc., and the system has a long service life. It is the most advanced and ideal treatment technology. Therefore, reverse osmosis membranes have been widely used in fields such as electric power, metallurgy, petroleum and petrochemicals, medicine, food, municipal engineering, and seawater desalination. [0003] Early reverse osmosis membranes were manufactured by casting m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/56
Inventor 吴宗策金焱赵小阳张强蔡志奇
Owner VONTRON MEMBRANE TECH CO LTD
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