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Preparation method of polyamide composite nanofiltration membrane

A composite nanofiltration membrane, polyamide technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low water flux, increase energy consumption, increase operating pressure, etc. Separation of selective effects

Inactive Publication Date: 2012-08-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the polyamide nanofiltration membrane has good hydrophilicity, in order to obtain a high rejection rate, the monomer concentration used is often high (generally higher than 0.5%), and the water flux is often low (generally tens of L / (m 2 hMPa))
At the same time, when using higher monomer concentration, increasing the operating pressure (0.5-1.0MPa) in order to obtain higher flux will increase energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 2.6g of polyacrylonitrile PAN and dissolve it in 17.4g of dimethyl sulfoxide DMSo, and stir for 4 hours in a water bath at a constant temperature of 60°C to prepare a casting solution. Leave the casting solution at 60°C for 4 hours to defoam. After cooling to room temperature, pour the casting solution on a glass plate to scrape the film, then put it in a water bath at 50°C to solidify to form a film, remove it from the substrate, and wash it with deionized water. Soak for 24 hours to obtain a polyacrylonitrile PAN-based film. Soak the polyacrylonitrile PAN-based film in a sodium hydroxide NaOH aqueous solution with a molar concentration of 1mol / L at 50°C for 1h. Then the membrane was taken out and washed with deionized water to pH=7, and then soaked in 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride EDC·HCl with a molar concentration of 50mmol / L And in the NHS mixture of N-hydroxysuccinimide NHS with a molar concentration of 25mmol / L. EDC / NHS mixed so...

Embodiment 2

[0019] Weigh 2.6g of polyacrylonitrile PAN and dissolve it in 17.4g of dimethyl sulfoxide DMSo, and stir for 4 hours in a water bath at a constant temperature of 60°C to prepare a casting solution. Leave the casting solution at 60°C for 4 hours to defoam. After cooling to room temperature, pour the casting solution on a glass plate to scrape the film, then put it in a water bath at 50°C to solidify to form a film, remove it from the substrate, and wash it with deionized water. Soak for 24 hours to obtain a polyacrylonitrile PAN-based film. Soak the polyacrylonitrile PAN-based film in a sodium hydroxide NaOH aqueous solution with a molar concentration of 1mol / L at 50°C for 1h. Then the membrane was taken out and washed with deionized water to pH=7, and then soaked in 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride EDC·HCl with a molar concentration of 50mmol / L And in the NHS mixture of N-hydroxysuccinimide NHS with a molar concentration of 25mmol / L. EDC / NHS mixed so...

Embodiment 3

[0022] Weigh 2.6g of polyacrylonitrile PAN and dissolve it in 17.4g of dimethyl sulfoxide DMSo, and stir for 4 hours in a water bath at a constant temperature of 60°C to prepare a casting solution. Leave the casting solution at 60°C for 4 hours to defoam. After cooling to room temperature, pour the casting solution on a glass plate to scrape the film, then put it in a water bath at 50°C to solidify to form a film, remove it from the substrate, and wash it with deionized water. Soak for 24 hours to obtain a polyacrylonitrile PAN-based film. Soak the polyacrylonitrile PAN-based film in a sodium hydroxide NaOH aqueous solution with a molar concentration of 1mol / L at 50°C for 1h. Then the membrane was taken out and washed with deionized water to pH=7, and then soaked in 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride EDC·HCl with a molar concentration of 100mmol / L And in the NHS mixture of N-hydroxysuccinimide NHS with a molar concentration of 50mmol / L. EDC / NHS mixed s...

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PUM

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Abstract

The invention discloses a preparation method of a polyamide composite nanofiltration membrane, which comprises the following steps of partially hydrolyzing a polyacrylonitrile-based membrane under alkaline and heat treatment conditions, and activating the membrane in 1-ethyl-(3-dimethyl amino propyl) carbonyl diimine hydrochloride ethylene dichloride-hydrogen chloride (EDC-HCl) and N-hydroxyl succinimide (NHS); and then sequentially immersing the membrane in water phase monomer piperazine with low concentration and organic phase monomer benzenetricarbonyl trichloride, and the polyamide composite nanofiltration membrane is prepared by interfacial polymerization. The preparation method of the polyamide composite nanofiltration membrane has the advantages that compared with a traditional method, the method utilizes monomer solution with low concentration to perform the interfacial polymerization, high permeation flux can be obtained under ultra-low pressure (0.1MPa), and filter dye solution and saline solution have high separation selectivity.

Description

technical field [0001] The invention relates to a preparation method of a polyamide composite nanofiltration membrane, in particular to a preparation method of an interface polymerization of a polyamide composite nanofiltration membrane. Background technique [0002] Nanofiltration membrane technology is a new membrane separation technology with a separation accuracy between ultrafiltration and reverse osmosis. Its operating pressure is usually 0.3-1.0MPa, and its molecular weight cut-off is in the range of 200-1000. Compared with reverse osmosis, nanofiltration membranes have higher water flux at lower operating pressures and higher rejection rates for divalent ions and small organic molecules. Nanofiltration membranes are widely used in the desalination of brackish water, printing and dyeing wastewater treatment, biochemical preparations and pharmaceutical purification and other fields. [0003] At present, nanofiltration membranes are classified into two types: asymmet...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D69/12B01D67/00
Inventor 姜忠义苏延磊彭金明
Owner TIANJIN UNIV
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