Preparation method for anti-pollution hydrophilic positive permeable membrane

A forward osmosis membrane and hydrophilic technology, applied in the field of membrane separation, can solve the problems of numerous synthesis steps and harsh conditions, and achieve the effect of simple membrane forming process, mild conditions and convenient synthesis

Inactive Publication Date: 2017-01-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These reports all use living radical polymerization to synthesize zwitterionic polymers, with many synthetic steps and harsh conditions.

Method used

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  • Preparation method for anti-pollution hydrophilic positive permeable membrane
  • Preparation method for anti-pollution hydrophilic positive permeable membrane
  • Preparation method for anti-pollution hydrophilic positive permeable membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing an anti-fouling hydrophilic forward osmosis membrane, the specific steps are:

[0029] (1) One-pot preparation of zwitterions with terminal amino groups:

[0030] Dissolve N,N-dimethyl-1,3-diaminopropane and 1,3-propane sultone in acetone solvent at a molar ratio of 1:1.1, heat up to 30°C, and mechanically stir at the same time, React for 8 hours, filter, wash the obtained dark green solid with acetone three times to remove unreacted monomer, and dry it in vacuum at 50°C for 24 hours to obtain zwitterions with terminal amino groups.

[0031] (2) Prepare polyethersulfone support layer by phase inversion method:

[0032] Dissolve 12 parts by weight of PES (BASF, UltrasonE3010) and 10 parts by weight of porogen PEG 400 in N'N-dimethylformamide (DMF) and N'N-dimethylpyrrolidone (NMP ) in 78 parts by weight of mixed solvent, heat up to 25°C, stir to dissolve for 8 hours, and let it stand for defoaming for 24 hours; take a clean and dry ordinary glass...

Embodiment 2

[0037] A method for preparing an anti-fouling hydrophilic forward osmosis membrane, the specific steps are:

[0038] (1) One-pot preparation of zwitterions with terminal amino groups:

[0039]Dissolve N,N-dimethyl-1,3-diaminopropane and 1,3-propane sultone in acetone solvent at a molar ratio of 1:1.1, heat up to 50°C, and mechanically stir at the same time, React for 6 hours, filter, wash the obtained dark green solid with acetone three times to remove unreacted monomer, and dry it in vacuum at 50°C for 24 hours to obtain zwitterions with terminal amino groups.

[0040] (2) Prepare polyethersulfone support layer by phase inversion method:

[0041] Dissolve 18 parts by weight of PES (BASF, UltrasonE3010) and 12 parts by weight of porogen PEG 400 in N'N-dimethylformamide (DMF) and N'N-dimethylpyrrolidone (NMP ) in 70 parts by weight of mixed solvent, heat up to 50°C, stir to dissolve for 8 hours, and let it stand for defoaming for 24 hours; take a clean and dry ordinary glass ...

Embodiment 3

[0046] A method for preparing an anti-fouling hydrophilic forward osmosis membrane, the specific steps are:

[0047] (1) One-pot preparation of zwitterions with terminal amino groups:

[0048] Dissolve N,N-dimethyl-1,3-diaminopropane and 1,3-propane sultone in acetone solvent at a molar ratio of 1:1.1, heat up to 50°C, and mechanically stir at the same time, React for 5 hours, filter, wash the obtained dark green solid with acetone three times to remove unreacted monomer, and dry it in vacuum at 50°C for 24 hours to obtain zwitterions with terminal amino groups.

[0049] (2) Prepare polyethersulfone support layer by phase inversion method:

[0050] Dissolve 20 parts by weight of PES (BASF, UltrasonE3010) and 10 parts by weight of porogen PEG 400 in N'N-dimethylformamide (DMF) and N'N-dimethylpyrrolidone (NMP ) in 70 parts by weight of mixed solvent, heat up to 60°C, stir to dissolve for 8 hours, and let it stand for defoaming for 24 hours; take a clean and dry common glass p...

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Abstract

The invention provides a preparation method for an anti-pollution hydrophilic positive permeable membrane. The method is characterized by comprising the following steps: preparing amino-terminated zwitterion according to a one-pot method; utilizing a phase inversion method to prepare a polyether sulfone support layer; utilizing interfacial polymerization to prepare a polyamide compound membrane on the surface of the polyether sulfone support layer; utilizing unreacted acyl chloride group on the surface of the compound membrane to react with the amino-terminated group of zwitterion, thereby obtaining the anti-pollution hydrophilic positive permeable membrane. The modified positive permeable membrane prepared according to the method provided by the invention has the advantages of higher hydrophilia and water flux, strong anti-pollution capacity, lowered cleaning cost of the membrane and greatly prolonged service life of the membrane. The method for preparing the anti-pollution hydrophilic separating membrane is strong in universality and is suitable for a nanofiltration membrane or a reverse osmosis membrane with a polyamide coating on the surface.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a hydrophilic anti-pollution forward osmosis membrane and a preparation method thereof. Background technique [0002] Forward osmosis (forward osmosis, FO) separation technology is an emerging technology that uses natural osmosis to relieve the pressure on water and energy in the future. It is known as the most cutting-edge and most potential water purification and desalination technology in the world. . Due to the low energy consumption during use, forward osmosis is receiving more and more attention. Forward osmosis is the process of using the osmotic pressure difference on both sides of the semipermeable membrane as the driving force to drive water from the feed solution with low osmotic pressure to the draw solution with high osmotic pressure. Compared with reverse osmosis, forward osmosis is a spontaneous process, which only requires an osmotic pressure differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/68B01D69/12B01D69/02B01D67/00B01D61/00
CPCB01D61/002B01D69/02B01D69/125B01D71/56B01D71/68B01D2325/36
Inventor 何春菊邱明
Owner DONGHUA UNIV
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