Aliphatic polyamide loose reverse osmosis membrane as well as preparation method and application thereof

An aliphatic polyamide, loose reverse osmosis technology, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of divalent, poor pollution resistance, low retention rate, etc., to achieve excellent divalent salts Retention rate, effect of excellent contamination resistance

Pending Publication Date: 2018-07-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the existing nanofiltration membrane separation status and preparation, the purpose of the present invention is to provide a kind of aliphatic polyamide loose reverse osmosis membrane and its preparation method and application, to solve the low flux of the existing nanofiltration membrane , bivalent (Ca 2+ , Mg 2+ ) low rejection rate and poor pollution resistance

Method used

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  • Aliphatic polyamide loose reverse osmosis membrane as well as preparation method and application thereof
  • Aliphatic polyamide loose reverse osmosis membrane as well as preparation method and application thereof
  • Aliphatic polyamide loose reverse osmosis membrane as well as preparation method and application thereof

Examples

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Embodiment 1

[0040] A preparation method for an aliphatic polyamide loose reverse osmosis membrane, comprising the following steps:

[0041] (1) First soak the polyethersulfone ultrafiltration bottom membrane in the chain aliphatic amine solution, take it out after 120s, and purge the surface of the ultrafiltration membrane with gas to remove the excess chain aliphatic amine solution on the ultrafiltration membrane surface, wherein, The chain aliphatic amine solution is composed of diethylenetriamine and water, the mass fraction of diethylenetriamine is 1wt%, and the massfraction of water is 99wt%;

[0042] (2) Soak the cycloaliphatic acid chloride solution on the polyethersulfone ultrafiltration bottom membrane that contains the chain aliphatic amine solution on the surface prepared in step (1) to carry out interfacial polymerization, take it out after 60s, wherein the cycloaliphatic acid chloride solution is prepared by Composed of 1,3,5-cyclohexanetrichloride and an oil phase solvent, t...

Embodiment 2

[0049] A preparation method for an aliphatic polyamide loose reverse osmosis membrane, comprising the following steps:

[0050] (1) Coating chain-like aliphatic amine solution on the polyethersulfone ultrafiltration bottom membrane, after 120s, purging the surface of the ultrafiltration membrane with gas to remove excess chain-like aliphatic amine solution on the surface of the polyethersulfone ultrafiltration membrane, Wherein, the chain aliphatic amine solution is composed of tris(2-aminoethyl)amine and water, the mass fraction of tris(2-aminoethyl)amine is 1.5wt%, and the mass fraction of water is 98.5wt%;

[0051] (2) Soak the alicyclic acid chloride solution on the polyethersulfone ultrafiltration bottom membrane containing the chain aliphatic amine solution prepared in step (1) to carry out interfacial polymerization, and take it out after 60s, wherein the alicyclic acid chloride The solution is composed of 1,3,5-cyclohexanetrichloride and an oil phase solvent, the oil p...

Embodiment 3

[0058] A preparation method for an aliphatic polyamide loose reverse osmosis membrane, comprising the following steps:

[0059] (1) First soak the polyethersulfone ultrafiltration bottom membrane in the chain aliphatic amine solution, take it out after 4 minutes, and purge the surface of the polyethersulfone ultrafiltration membrane to remove the excess chain aliphatic amine solution on the surface of the ultrafiltration membrane , wherein the chain aliphatic amine solution is composed of tris(2-aminoethyl)amine, acetone and water, the mass fraction of tris(2-aminoethyl)amine is 1wt%, the massfraction of water is 98wt%, acetone The mass fraction of is 1wt%;

[0060] (2) Soak the alicyclic acid chloride solution on the polyethersulfone ultrafiltration bottom membrane containing chain aliphatic amine solution on the surface of the polyethersulfone ultrafiltration membrane prepared in step (1) to carry out interfacial polymerization, take it out after 90s, Wherein, the alicyclic...

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Abstract

The invention discloses a preparation method of an aliphatic polyamide loose reverse osmosis membrane. The preparation method comprises the following steps: coating a porous supporting membrane with achain type aliphatic amine solution by adopting a coating or immersing way, and then carrying out interfacial polymerization on the porous supporting membrane coated with the chain type aliphatic amine solution and a cycloaliphatic acyl chloride solution, thus forming the aliphatic polyamide loose reverse osmosis membrane. The aliphatic polyamide loose reverse osmosis membrane is prepared by carrying out the interfacial polymerization on cycloaliphatic acyl chloride and chain type aliphatic amine, has an excellent removal rate on divalent ions such as Ca<2+>, Mg<2+> and SO4<2->, has very goodanti-fouling performance and high water flux, can be used for removing COD such as dye molecules and phenolic molecules in wastewater, can also be applied to a separating and concentrating process ofmaterials in industries of pharmacy and food or the fields of water softening, seawater desalination or brackish water pretreatment, refuse leachate treatment and the like, and has a huge applicationprospect.

Description

technical field [0001] The invention relates to the technical field of preparation of water treatment materials, in particular to an aliphatic polyamide loose reverse osmosis membrane and its preparation method and application. Background technique [0002] Membrane separation technology solves the growing water supply problem with a process-intensive strategy. It has the advantages of using less raw materials, less energy consumption, small device size, and no pollution. It is considered to be a potential way. Commonly used water treatment membranes are divided into microfiltration membranes, ultrafiltration membranes, nanofiltration membranes and reverse osmosis membranes; among them, nanofiltration membranes are divided into two types, one type has high selectivity nanofiltration membranes (very high monovalent / Divalent selectivity), referred to as high-selectivity nanofiltration membrane; another type of water softening nanofiltration membrane used for calcium and magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D67/00B01D61/02B01D61/00C02F1/44
CPCB01D61/025B01D61/027B01D67/0006B01D71/56C02F1/441Y02A20/131
Inventor 牛青山远冰冰李鹏飞孙红红
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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