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Asymmetric oxidation-resistant permeable membrane and preparation method thereof

A permeable membrane, oxidation-resistant technology, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve the problems of reducing surface hydrophilicity, reducing water flux, etc. Stable operation and high reactivity

Inactive Publication Date: 2018-03-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amino groups on the surface of the polyamide permeable membrane are easily oxidized to nitro groups and hydroxyl amino groups, which reduces the surface hydrophilicity, and the phenomenon of concentration polarization is obvious, which reduces the water flux.

Method used

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  • Asymmetric oxidation-resistant permeable membrane and preparation method thereof
  • Asymmetric oxidation-resistant permeable membrane and preparation method thereof
  • Asymmetric oxidation-resistant permeable membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The NaCl aqueous solution with a concentration of 2M is used as the drawing solution, and the secondary water is used as the raw material solution to test the water flux and rejection rate of the sample as a forward osmosis membrane. First, the prepared hollow fiber permeable membrane was placed in a self-made detection device for forward osmosis test. At room temperature (23°C), a certain flow rate was adjusted and controlled to keep the water flow pressure at 0.1 MPa, and the positive osmosis test was performed using an AY220 electronic balance. The mass of feed solution consumed by the membrane. Measure the mass change every 1 minute, and calculate the water permeation per unit area and unit time of the forward osmosis membrane, which can reach a maximum of 40L / (m 2 h). The DDS-307 conductivity meter was used to test the concentration change before and after the draw solution, and the interception rate of the permeable membrane for salt ions was calculated. The per...

Embodiment 2

[0026] MgCl at a concentration of 2M 2 The aqueous solution is the drawing liquid, and the secondary water is used as the raw material liquid, and the test sample is used as the water flux and rejection rate of the forward osmosis membrane. Put the prepared hollow fiber forward osmosis membrane in a self-made detection device for forward osmosis test. At room temperature (23°C), adjust and control a certain flow rate to keep the water flow pressure at 0.1MPa, and use an electronic balance to test the forward osmosis membrane. The consumption quality of the raw material solution. Measure the mass change every 1 minute, and calculate the water permeation per unit area and unit time of the forward osmosis membrane, which can reach a maximum of 52L / (m 2 h). The DDS-307 conductivity meter was used to test the concentration change before and after the draw solution, and the interception rate of the permeable membrane for salt ions was calculated. Oxalic acid treated permeable mem...

Embodiment 3

[0028] A NaCl aqueous solution with a concentration of 0.6M was used to simulate seawater, and a pressure-damped osmosis (PRO) power generation system was constructed with river water as the infiltrate, and the water flux and rejection rate of the sample as a forward osmosis membrane were tested. First place the prepared hollow fiber permeable membrane in the PRO performance testing device. At room temperature (23°C), adjust the size of the valve to control a certain flow rate, and use an electronic balance to test the consumption quality of the raw material solution passing through the forward osmosis membrane. Measure the mass change every 1 minute, and calculate the water permeation per unit area and unit time of the forward osmosis membrane, which can reach a maximum of 100L / (m 2 h). Use the DDS-307 conductivity meter to test the concentration change in front of the draw solution, and calculate the interception rate of the permeable membrane for salt ions. The permeable m...

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Abstract

The invention discloses a preparation method of an asymmetric oxidation-resistant polyamide permeable membrane. This method uses terephthalic diammonium (MPD) and trimesoyl chloride (TMC) monomers to compound a layer of polyamide skin on the surface of polysulfone (PES) support membrane through interfacial condensation polymerization, and uses oxalic acid to coordinate dehydration. The post-treatment of the cortex was carried out with the agent, and the oxidation-resistant polyamide composite permeable membrane was prepared. The treatment method of oxalic acid combined with dehydrating agent used in the present invention can effectively improve the oxidation resistance and hydrophilicity of the polyamide skin layer, and cooperate with the asymmetric membrane structure to greatly reduce the influence of concentration polarization on membrane separation performance , to further improve the water flux and the rejection rate of salt ions of the membrane. The preparation method of the present invention is original, and the process is operated under normal temperature and pressure, the experimental conditions are simple, the preparation period is short, and it is especially suitable for the preparation of large batches of high-performance permeation separation membranes.

Description

field of invention [0001] The invention relates to an asymmetric oxidation-resistant polyamide permeable membrane and a preparation method thereof. technical background [0002] my country is a big country with severe water shortage, and the per capita water resource is only 1 / 4 of the world average. The shortage of water resources is becoming more and more serious, diverting the source of seawater and brackish water is an important way to solve the problem of water resources, and osmotic membrane separation technology will play an important role day by day. Polyamide permeable membrane has the characteristics of good hydrophilicity, large flux, and high ion rejection rate, and has good mechanical properties, thermal stability and hydrolytic stability. At present, the main applications of polyamide membranes include nanofiltration membranes (Nanofiltration, NF), reverse osmosis membranes (Reverse Osmosis, RO) and forward osmosis membranes (Forward Osmosis, FO). However, po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/02B01D67/00
Inventor 贾奇博杨海军沈建权刘必前
Owner INST OF CHEM CHINESE ACAD OF SCI
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