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High-flux composite reverse osmosis membrane

A reverse osmosis membrane, high-flux technology, applied in the field of water treatment, can solve problems such as low permeation flux, and achieve the effect of good hydrophilicity and anti-pollution performance.

Inactive Publication Date: 2012-07-04
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Therefore, a composite reverse osmosis membrane with high desalination rate can be obtained by interfacial polymerization between m-phenylenediamine and aromatic polyacyl chloride, but its permeation flux is low.

Method used

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  • High-flux composite reverse osmosis membrane

Examples

Experimental program
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Effect test

preparation example Construction

[0027] Preparation of composite reverse osmosis membrane: immerse the wet polysulfone support membrane in the polyamine aqueous solution containing acid receiver for 1-5 minutes, roll the surface of the support membrane with a rubber roller and squeeze it dry, and mix with the organic polysulfone containing aromatic polyacyl chloride The solution is contacted on one side to carry out the interfacial polymerization reaction. The composite film is dried in the air for 2-5 minutes, and then undergoes two-step heat treatment: the first step is to treat at 40-70°C for 3-5 minutes, and the second step is to treat at 70-110°C for 3-5 minutes. Then carry out two steps of rinsing again: the first step is to rinse 10-40 minutes in 30-60 DEG C of methanol weight ratio of 15% aqueous solution, and the second step is to rinse in 30-60 DEG C water for 10-40 minutes. The acid receiving agent wherein is triethylamine, or sodium hydroxide, or sodium carbonate, or trisodium phosphate, and the c...

Embodiment 1-6

[0030] Use 13.5wt% of UDELPS3500 polysulfone, 0.25wt% of water and 0.15wt% of nonylphenol polyoxyethyl ester phosphate dissolved in N, N-dimethylformamide, and scrape on the polyester non-woven fabric and then immersed in water to remove the solvent to obtain a polysulfone porous support membrane with a molecular weight cut-off of 9-100,000.

[0031] Immerse the wet polysulfone porous support membrane into an aqueous solution containing 3.0wt% triethylamine and 2.0wt% polyamine (m-phenylenediamine, sericin mixture) for 3 minutes, and roll the support membrane with a rubber roller After draining the aqueous solution and blowing dry the surface of the support membrane with nitrogen, contact with n-hexane solution containing 0.10wt% trimesoyl chloride on one side to carry out interfacial polymerization reaction for 40 seconds. The obtained composite film is dried in the air for 5 minutes, and then undergoes two steps of heat treatment: the first step is to treat at 60-70°C for 3-...

Embodiment 7-12

[0034]As in the previous examples, according to the above method, an aqueous solution containing 3.0 wt% triethylamine and 1.0-4.0 wt% polyamine (m-phenylenediamine: sericin = 25: 1) was used, and 0.10 wt% polyamine The n-heptane solution of trimelliticoyl chloride is contacted on one side to carry out interfacial polymerization reaction for 60 seconds to prepare a composite reverse osmosis membrane. These several examples are to investigate the effect of the polyamine content in the aqueous solution on the performance of the composite reverse osmosis membrane.

[0035] Example

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Abstract

The invention relates to a polymeric membrane for water treatment, in particular to a high-flux composite reverse osmosis membrane. An ultrathin desalination separation layer is compounded on a porous supporting membrane through interfacial polycondensation between a polyamine-containing aqueous solution and an organic solution containing aromatic polyacyl chloride; the polyamine is a mixture of metaphenylene diamine and sericin; and the aromatic polyacyl chloride is benzenetricarbonyl trichloride, 5-isocyanate- isophthaloyl chloride, 5-oxoformyl chloride-isophthaloyl chloride, isophthaloyl dichloride, paraphthaloyl chloride or 2,4-toluene diisocyanate. The high-flux composite reverse osmosis membrane has the advantages of readily available raw materials, low price and excellent selective separation property. The water flux of the high-flux composite reverse osmosis membrane is higher than that of the conventional polyamide composite reverse osmosis membrane. The high-flux composite reverse osmosis membrane has high membrane surface hydrophilicity and high pollution resistance. The high-flux composite reverse osmosis membrane has wide application.

Description

technical field [0001] The invention belongs to water treatment technology, in particular to a high-flux composite reverse osmosis membrane for water treatment. technical background [0002] Reverse osmosis technology is a high-efficiency, energy-saving green separation technology with outstanding features such as simple equipment, mild operating conditions, large processing capacity, and high separation efficiency. , environmental engineering, food, medicine and other fields have been widely used, and have achieved good economic and social benefits; in recent years, with the increasing shortage of global water resources and water pollution, reverse osmosis technology has The field of reuse has been more widely used and valued. [0003] The core of reverse osmosis technology is reverse osmosis membrane. Asymmetric reverse osmosis membrane and composite reverse osmosis membrane are two types of high-performance reverse osmosis membranes that have been commercially applied at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/68B01D71/72B01D67/00
Inventor 丁国良赵经纬俞三传王炎锋
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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