High-throughput polyamide nanofiltration composite membrane and preparation method thereof

A polyamide nano- and high-flux technology, applied in the field of nanofiltration membranes, can solve the problems of negative charge on the membrane surface and low flux, achieve good anti-pollution performance, reduce operating pressure, and reduce electrostatic attraction

Inactive Publication Date: 2018-06-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of high-flux polyamide nanofiltration composite membrane and its preparation method to solve the problems of negative charge on the membrane surface and low flux of the existing commercial nanofiltration membrane due to the hydrolysis of acid chloride groups

Method used

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  • High-throughput polyamide nanofiltration composite membrane and preparation method thereof
  • High-throughput polyamide nanofiltration composite membrane and preparation method thereof
  • High-throughput polyamide nanofiltration composite membrane and preparation method thereof

Examples

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Embodiment 1

[0032] In this embodiment, the polyethersulfone ultrafiltration membrane is used as the support layer, the aqueous solution of piperazine is used as the aqueous phase solution, and the n-hexane toluene mixed solution of 5-(N-sulfinamide) isophthaloyl chloride is used as the organic phase solution. Fabrication of Nanofiltration Composite Membranes by Interfacial Polymerization. Specific steps are as follows:

[0033] 1) impregnating the polyethersulfone ultrafiltration support layer with a 1.0wt% piperazine aqueous solution, soaking for 2 minutes, using an air knife to remove the excess 1.0wt% piperazine aqueous solution on the ultrafiltration support layer, and forming an aqueous phase liquid layer on its surface;

[0034] 2) The aqueous phase liquid layer is contacted with the n-hexane solution containing 1.0 wt% toluene containing 0.15 wt% 5-(N-sulfinamide) isophthaloyl chloride for 1 min, and through interfacial polymerization, the A polyamide layer is formed on the surfac...

Embodiment 2

[0037] In this embodiment, the polyethersulfone ultrafiltration membrane is used as the support layer, the aqueous solution of piperazine is used as the aqueous phase solution, and the n-hexane toluene mixed solution of 5-(N-sulfinamide) isophthaloyl chloride is used as the organic phase solution. Fabrication of Nanofiltration Composite Membranes by Interfacial Polymerization. Specific steps are as follows:

[0038] 1) impregnating the polyethersulfone ultrafiltration support layer with a 1.0wt% piperazine aqueous solution, soaking for 2 minutes, using an air knife to remove the excess 1.0wt% piperazine aqueous solution on the ultrafiltration support layer, and forming an aqueous phase liquid layer on its surface;

[0039] 2) The aqueous phase liquid layer is contacted with a n-hexane solution containing 1.0 wt% toluene containing 0.10 wt% 5-(N-sulfinamide) isophthaloyl chloride for 1 min, and through interfacial polymerization, the A polyamide layer is formed on the surface ...

Embodiment 3

[0042] In this embodiment, the polyethersulfone ultrafiltration membrane is used as the support layer, the aqueous solution of piperazine is used as the aqueous phase solution, and the n-hexane toluene mixed solution of 5-(N-sulfinamide) isophthaloyl chloride is used as the organic phase solution. Fabrication of Nanofiltration Composite Membranes by Interfacial Polymerization. Specific steps are as follows:

[0043] 1) impregnating the polyethersulfone ultrafiltration support layer with a 1.5wt% piperazine aqueous solution, soaking for 2 minutes, using an air knife to remove the excess 1.5wt% piperazine aqueous solution on the ultrafiltration support layer, and forming an aqueous liquid layer on its surface;

[0044] 2) The aqueous phase liquid layer is contacted with the n-hexane solution containing 1.0 wt% toluene containing 0.15 wt% 5-(N-sulfinamide) isophthaloyl chloride for 1 min, and through interfacial polymerization, the A polyamide layer is formed on the surface of t...

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Abstract

The invention discloses a high-throughput polyamide nanofiltration composite membrane and a preparation method thereof, which belong to the field of polymeric membrane materials. The composite membrane is prepared by the interfacial polymerization reaction between 5-(N-sulfonamido)isophthaloyl dichloride or a mixture of 5-(N-sulfonamido)isophthaloyl dichloride and 1,3,5-trimesoyl chloride and piperazine monomer, and can be widely used in a water softening process for removing bivalent cations such as Ca<2+> and Mg<2+>. The high-throughput polyamide nanofiltration composite membrane is structurally provided with an ultrathin (10nm) release layer, surface charge are low in electronegativity, the membrane surface property is smooth and hydrophilic, high throughput is shown in terms of properties, the high-throughput polyamide nanofiltration composite membrane has an excellent trapping effect on bivalent and polyvalent cations and good pollution resistance, and the high-throughput polyamide nanofiltration composite membrane can be widely applied in high-throughput domestic water purifiers, sea water desalination, brackish water pretreatment, removal of COD (chemical oxygen demand) suchas dye molecules and phenol molecules in wastewater, separation of dye/salt and material separation and concentration processes in pharmaceutical and food industries.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a high-throughput polyamide nanofiltration composite membrane and a preparation method thereof. Background technique [0002] Nanofiltration membrane technology is a new type of membrane separation technology between reverse osmosis and ultrafiltration, which was gradually developed on the basis of reverse osmosis technology. It was called "low pressure reverse osmosis" or "loose reverse osmosis" in the early days. The nanofiltration membrane can effectively intercept divalent and high-valent ions and organic substances with a molecular weight greater than 200Da, and allow most monovalent inorganic salts to pass through, and can separate similar amino acids and proteins, and realize the separation and retention of high-molecular-weight and low-molecular-weight organic substances. At about 1nm, it is suitable for separating nanoscale dissolved components, so it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/02B01D69/12
CPCB01D71/56B01D69/02B01D69/125
Inventor 牛青山胡平郭鑫徐泽文
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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