Polyester amide reverse osmosis compound film and its preparation method

A technology of reverse osmosis composite membrane and polyester amide, which is applied in the field of polyester amide reverse osmosis composite membrane and its preparation, and can solve problems such as unsatisfactory desalination rate and water flux

Inactive Publication Date: 2007-05-02
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But other properties such as salt rejection and water flux are not ideal

Method used

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  • Polyester amide reverse osmosis compound film and its preparation method
  • Polyester amide reverse osmosis compound film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 2% (wt%) glucosamine and 0.1% (wt%) sodium dodecyl sulfate are formulated into an aqueous solution, and the pH is adjusted to 12 with sodium hydroxide; trimesic acid chloride (TMC) is dissolved in n-hexane to prepare into a 0.1% (wt%) organic phase solution. Immerse the polysulfone supported membrane on one side in a 2% aqueous solution for 3 minutes; drain off excess aqueous solution and react with the organic phase for 30 seconds; drain off the organic phase and dry in air for 1 minute; Heat treatment at 75° C. for 3 minutes in a box; rinse with deionized water to obtain a reverse osmosis composite membrane.

[0022] The reverse osmosis composite membrane prepared above was dried, and its infrared absorption was measured with an attenuated total reflection Fourier transform infrared spectrometer. It was found that: 1663cm -1 , 1540cm -1 There is absorption at amide I band and amide II band characteristic peaks, respectively, which proves the formation of amide bond...

Embodiment 2

[0024] Following the same procedure as Example 1, a reverse osmosis composite membrane was prepared. The composition of the aqueous phase is: 1.2% (wt%) m-phenylenediamine, 0.8% (wt%) glucosamine and 0.1% (wt%) sodium dodecyl sulfate, pH=12 is adjusted with sodium hydroxide; the organic phase is 0.1% (wt%) of TMC was dissolved in n-hexane to prepare; the polysulfone support membrane was immersed in the aqueous phase solution on one side for 3 minutes; the excess aqueous solution was drained, and the organic phase was reacted for 60 seconds; the organic phase was drained , and dried in air for 3 minutes; heat-treated at 85° C. for 5 minutes in a blast drying oven; rinsed with deionized water to obtain a reverse osmosis composite membrane.

[0025] The properties were determined as previously described. At the concentration of 20000mg / L sodium chloride aqueous solution, the operating pressure is 1.6MPa, and the temperature is 25℃, the flux is 29.3L / m 2 h, the salt rejection ra...

Embodiment 3

[0027] Following the same procedure as Example 1, a reverse osmosis composite membrane was prepared. The composition of the aqueous phase is: 1.2% (wt%) m-phenylenediamine, 0.8% (wt%) glucosamine and 0.1% (wt%) sodium dodecyl sulfate, pH=12 is adjusted with sodium hydroxide; the organic phase is 0.2% (wt%) TMC dissolved in C 12 Prepared in solvent oil; immerse the polysulfone support membrane in the aqueous phase solution on one side for 3 minutes; drain off the excess aqueous solution, and react with the organic phase for 60 seconds; drain the organic phase and dry it in the air for 5 minutes; Heat treatment at 85°C for 10 minutes in a blast drying oven; rinse with deionized water to obtain a reverse osmosis composite membrane.

[0028] The properties were determined as previously described. At the concentration of 20000mg / L sodium chloride aqueous solution, the operating pressure is 1.6MPa, and the temperature is 25℃, the flux is 20.9L / m 2 ·h, the salt rejection rate was ...

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Abstract

A composite reverse osmosis polyester-amide membrane is composed of a porous supporting layer, and a compact polyester-amide surface layer prepared by interface polymerization between aminoglucose or aminobiglucose or the mixture of aminoglucose and metaphenyldiamine and the polyatomic acyl chloride. Its preparing process includes such steps as immersing the one surface of polysulfone film in the aqueous solution of amino monomer, dripdrying, interface polymerization reaction on the solution of polyatomic acyl chloride, drying, heat treating and rinsing in deionized water. It has high water throughput.

Description

technical field [0001] The invention relates to a reverse osmosis composite membrane and a preparation method thereof, in particular to a polyester amide reverse osmosis composite membrane and a preparation method thereof. Background technique [0002] As one of the most advanced membrane separation technologies in the world, reverse osmosis has the advantages of high purification rate and low cost. It is widely used in seawater and brackish water desalination, pure water and ultrapure water preparation, industrial water treatment, and wastewater resources. chemical and other fields. Reverse osmosis membrane is the core of reverse osmosis technology. In 1960, Loeb and Sourirajan of the University of California in the United States first made the world's historic high desalination (98.6%), high flux (259L / d m at 10.1MPa) 2 ) of the asymmetric cellulose acetate reverse osmosis membrane, which greatly promoted the development of reverse osmosis membrane technology. In 1978, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D69/12B01D71/56
Inventor 王铎娄红瑞高从堦
Owner OCEAN UNIV OF CHINA
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