Method for preparing reverse osmosis composite membrane with high salt rejection rate and high flux by reforming polyamide separation layer

A technology of reverse osmosis composite membrane and rejection rate, which is applied in the field of preparation of liquid separation membranes. Significant increase in throughput, easy industrial scale-up, and simple preparation process

Pending Publication Date: 2022-02-25
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is to influence the interfacial polymerization process by optimizing the interfacial polymerization process parameters, and then regulate the structure of the polyamide separation layer. This method is simple and easy to scale up, but the ability to improve the salt rejection rate and water flux of the membrane is limited.
The second is to introduce nanomaterials into the polyamide separation layer to build water mass transfer channels to improve membrane water flux, but this method is costly, complicated, and difficult for industrial scale-up
The third is to develop a new type of interfacial polymerized monomer and optimize the structure of the polyamide separation layer to increase the salt rejection rate and water flux of the membrane. This method has high research and development costs, long research and d

Method used

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  • Method for preparing reverse osmosis composite membrane with high salt rejection rate and high flux by reforming polyamide separation layer
  • Method for preparing reverse osmosis composite membrane with high salt rejection rate and high flux by reforming polyamide separation layer
  • Method for preparing reverse osmosis composite membrane with high salt rejection rate and high flux by reforming polyamide separation layer

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] (1) Preparing a polyamide primary film by interface polysulfone is prepared by dipping the polysulfone base membrane at room temperature with 3.0 wt.% Amine diamine, 2.6 wt.% Camphor sulfonic acid, 1.1 wt.% Triethylamine, 0.1 WT.% of the aqueous phase solution of sodium sulfonate sodium sulfonate; remove the residual aqueous phase solution by rubber roller; saturate the base membrane of the aqueous phase solution under the room temperature containing 0.2 wt.% benzene. Trimethyl chloride n-heptane oil phase solution interface polymerizes 1min, heat treatment for 5 min 30s in an oven at 80 ° C for 5 min 30s.

[0024] (2) After the primary film is soaked in pure water for 10 min, the membrane is soaked in 5 wt.% 4-dimethyl aminopyridine modified aqueous solution 5S, pour the residual modified solution, and press the pure water to repeatedly rinse the membrane surface, The modified polyamide reverse osmosis membrane was obtained.

[0025] In the operational p...

Example Embodiment

[0026] Example 2

[0027] (1) The preparation of the primary film is the same as in Example 1.

[0028] (2) After the primary film was soaked in pure water for 1 min, the membrane was soaked in 1 min in a solution containing 2 wt.% 4-dimethylaminopyridine modified aqueous solution, poured down the residual modified solution, and was repeatedly rinsed with pure water. The modified polyamide reverse osmosis membrane was obtained.

[0029]In the operation pressure of 1.55 MPa, the test temperature is 25 ° C, the reforming of the 2000 mg / L sodium chloride solution is 99.13%, and the flux is 61.65 under the wrong flow test conditions of the test temperature of 25 ° C. L. M -2 · H -1 .

Example Embodiment

[0030] Example 3

[0031] (1) The preparation of the primary film is the same as in Example 1.

[0032] (2) After soaking 30 minutes in pure water, the membrane was soaked in the isomeric alkane modification solution containing 5 wt.% 4-dimethaminopyridine, poured down the residual modified solution, and repeatedly with pure water. Flush the membrane surface to prepare a modified polyamide reverse osmosis membrane.

[0033] In the operation pressure of 1.55 MPa, test temperature 25 ° C, test error test conditions for the misalgic flow rate 1.5 l / min, the retention rate of the 2000 mg / L sodium chloride solution is 99.33%, and the flux is 54.80. L. M -2 · H -1 .

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Abstract

The invention relates to a method for preparing a reverse osmosis composite membrane with high salt rejection rate and high flux by reforming a polyamide separation layer. The method is characterized in that after interfacial polymerization membrane preparation, the membrane is soaked in a modified solution containing a nucleophilic catalyst to prepare the reverse osmosis composite membrane with high salt rejection rate and high flux. The mass percentage concentration of the nucleophilic catalyst in the modified solution is 0.01%-5%. The modified nucleophilic catalyst is prepared from 4-dimethylaminopyridine, 4-pyrrolidinyl pyridine and N-methylimidazole. The solvent comprises water, normal hexane and normal heptane. After modification, a sodium chloride solution with the concentration of 2000 mg/L is adopted for testing the salt rejection rate and the water flux of the membrane, and under the operation pressure of 15.5 bar, the water flux of the membrane is 38.46-84.90 L.m<-2>. h<-1>, and the salt rejection rate is 98.00-99.54%. The whole membrane preparation process is simple and easy to amplify.

Description

technical field [0001] The invention relates to a method of strengthening the nucleophilic reaction between the residual amine group and the acid chloride group in the polyamide layer through a nucleophilic catalyst, and reforming the structure of the separation layer of the reverse osmosis composite membrane with polyamide as the separation layer material to prepare a The invention relates to a reverse osmosis membrane method with high sodium chloride rejection rate and high flux, belonging to the field of liquid separation membrane preparation. Background technique [0002] Reverse osmosis membrane technology has a wide range of applications in seawater desalination, wastewater treatment, antibiotic concentration and other fields. Membrane technology is of great value in alleviating the shortage of fresh water resources because of its environmental friendliness, easy operation, easy scale-up, low energy consumption, and small device footprint. Reverse osmosis membrane is ...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D71/56
CPCB01D67/0006B01D69/125B01D69/12B01D71/56Y02A20/131
Inventor 王志吴浩文刘莹莹王宠李旭王纪孝
Owner TIANJIN UNIV
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