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Azlactone-based polyamide membrane and preparation method thereof

A technology of ester-based polyamide membrane and based polyamide membrane, which is applied in the field of nanofiltration membranes and can solve the problems of low metal cation rejection rate, large membrane surface roughness, and poor pollution resistance.

Active Publication Date: 2018-07-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a novel azlactone-based polyamide membrane to solve the problem of Ca 2+ and Mg 2+ The low rejection rate of divalent metal cations, and the large surface roughness of the membrane lead to poor pollution resistance.

Method used

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  • Azlactone-based polyamide membrane and preparation method thereof
  • Azlactone-based polyamide membrane and preparation method thereof
  • Azlactone-based polyamide membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0067] The preparation method of the azlactone-based polyamide film of the present embodiment comprises the following steps:

[0068] (1) Soak the polyethersulfone ultrafiltration bottom membrane in polyethyleneimine (Mw=70,000) containing 2wt% for 4 minutes, and then purge the gas for 3 minutes to remove excess aqueous amine solution;

[0069] (2) Soak the polyethersulfone ultrafiltration membrane with polyethyleneimine solution prepared in step (1) in 1,3,5-tris-4,4-dimethylacridine containing 0.1 wt% Esterbenzene / cyclohexane solution, the interfacial polymerization time is 120s, and then the prepared polyamide nanofiltration membrane is treated at 60°C for 15min to obtain an azlactone-based polyamide membrane.

[0070] Table 1 shows the salt rejection performance of the azlactone-based polyamide membrane prepared by interfacial polymerization of 1,3,5-tris-4,4-dimethylazlactone and polyethyleneimine in the embodiment of the present invention; Test conditions: cross-flow te...

Embodiment 2

[0074] The preparation method of the azlactone-based polyamide film of the present embodiment comprises the following steps:

[0075] (1) Soak the polyethersulfone ultrafiltration bottom membrane in an aqueous solution containing 1.5wt% tris(2-aminoethyl)amine for 4 minutes, and then purging the gas for 3 minutes to remove excess aqueous phase solution;

[0076] (2) Soak the polyethersulfone ultrafiltration membrane with tris(2-aminoethyl)amine solution prepared in step (1) in 1,3,5-tris-4,4-bis Methylazlactone benzene / cyclohexane solution, the interfacial polymerization time is 60s, and then the prepared polyamide nanofiltration membrane is treated at 60°C for 15min to obtain an azlactone-based polyamide membrane.

[0077] Table 2 shows the salt rejection performance of the polyamide nanofiltration membrane prepared by interfacial polymerization of 1,3,5-tris-4,4-dimethylazlactone and tris(2-aminoethyl)amine; test conditions : Cross-flow test, the single salt solution is 200...

Embodiment 3

[0081] The preparation method of the azlactone-based polyamide film of this example is different from that of Examples 1 and 2. In this example, the monomer containing an azlactone structure is mixed with an acid chloride monomer oil phase solution, and then reacted with an amine to obtain An azlactone-based polyamide membrane, comprising the steps of:

[0082] (1) Soak the polysulfone ultrafiltration bottom membrane in an aqueous solution containing 1wt% piperazine for 2 minutes, after which, gas purge for 2 minutes to remove excess aqueous phase solution;

[0083] (2) Soak the polysulfone ultrafiltration membrane of the piperazine aqueous solution prepared in step (1) in a solution containing 0.025wt% 1,3,5-trimesine-4,4-dimethylazlactone and 0.15wt% 1,3,5-trimesoyl chloride benzene / cyclohexane solution, wherein the mass fraction of 1,3,5-tris-4,4-dimethylazlactone is 0.025wt%, 1, The mass fraction of 3,5-trimesoyl chloride is 0.15wt%, the mass fraction of solvent benzene i...

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Abstract

The invention discloses a novel azlactone-based polyamide membrane and a preparation method thereof, and belongs to the technical field of a nanofiltration membrane (loose reverse osmosis membranes).The azlactone-based polyamide membrane is formed by monomers containing azlactone groups and primary aliphatic monomers through interface polymerization reaction; the azlactone-based polyamide membrane shows the electric neutral state or the electropositivity state on a surface structure and has a smooth membrane surface; good anti-pollution performance and excellent interception effect on bivalent and multivalence cations are shown in aspects of performance; the CUT-OFF of the azlactone-based polyamide membrane is 300 to 600 Dalton. The azlactone-based polyamide membrane can be widely appliedto material separation processes such as water softening, dye / salt separation, and concentration and separation of amino acid polypeptide molecules with different molecular weights, and can also be used in the water treatment fields of sea water desalination, brackish water pretreatment and the like.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes (loose reverse osmosis membranes), in particular to a novel azlactone-based polyamide membrane. The present invention can be widely used for Ca 2+ , Mg 2+ The water softening process for the removal of divalent cations, such processes are mostly used in the fields of household water purifiers, seawater desalination and brackish water pretreatment, and can also be used for the removal of COD in wastewater, such as dye molecules, phenolic molecules, etc., dyes / Salt separation can also be used in the separation and concentration process of materials in the pharmaceutical and food industries. Background technique [0002] Compared with traditional separation technologies such as distillation and rectification, membrane separation technology is a new type of alternative separation technology. It has the advantages of less energy consumption and small footprint, and is widely used in...

Claims

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Application Information

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IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/56C02F5/00C02F1/44C02F103/08
CPCB01D61/025B01D61/027B01D67/0006B01D69/02B01D71/56B01D2325/16C02F1/441C02F1/442C02F5/00C02F2103/08Y02A20/131
Inventor 牛青山远冰冰孙红红李鹏飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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