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Composite forward osmosis membrane and preparation method thereof

A forward osmosis membrane and casting liquid technology, which is applied in the field of preparation of polymer membranes for water treatment, can solve the problem that the flux of the forward osmosis membrane is not greatly improved, and can reduce the phenomenon of internal concentration polarization and improve the water flow. Quantity, good hydrophilic effect

Inactive Publication Date: 2016-12-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the composite forward osmosis membrane can optimize the bottom membrane and the surface active separation layer during the preparation process, its structure can minimize the influence of internal concentration polarization on water flux, making it easier to prepare high-flux forward osmosis membranes. Permeable membrane, and different materials can be used in different solution systems. Due to the advantages of composite forward osmosis membranes, many research institutions in the world are currently researching and exploring the preparation of composite forward osmosis membranes, but in general, forward osmosis membranes The throughput increase is not very large

Method used

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  • Composite forward osmosis membrane and preparation method thereof

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preparation example Construction

[0049] Preparation method of composite forward osmosis membrane

[0050] The preparation method of composite forward osmosis membrane provided by the invention comprises the following steps:

[0051] (1) coating the casting solution on the low-density non-woven fabric layer, and phase inverting in the gel bath to obtain a porous support layer;

[0052] (2) On the porous support layer, the polyvalent amine aqueous solution reacts with the polyvalent acid chloride organic solution to form the ultra-thin separation layer, thereby obtaining the composite forward osmosis membrane.

[0053] The casting solution is prepared by dissolving a polymer in an organic solvent, wherein the polymer is polysulfone, polyethersulfone, sulfonated polysulfone, polysulfone amide, polyarylether sulfone ketone, polyarylether nitrile Ketone, copolyethersulfone, polyvinylidene fluoride, polyacrylonitrile, or cellulose acetate and their mixtures, the solvent is N,N-dimethylformamide, N,N-dimethylacetam...

Embodiment 1

[0070] Weigh 16g of polysulfone, dissolve it in 84g of a mixed solvent composed of N,N-dimethylacetamide and PEG-400, and prepare a bottom membrane casting solution with a polymer concentration of 18%. Add 2g of hydrophilic nano-particle montmorillonite to the prepared bottom film casting solution to form a bottom film casting solution with a montmorillonite concentration of 2%, and disperse in ultrasonic for 30 minutes to obtain a bottom film casting film with uniformly dispersed nanoparticles liquid. The bottom membrane casting liquid is used on the low-density non-woven support layer, the scraper is scraped with a certain thickness, and the membrane is gelled in deionized water in a gel bath to form a polysulfone ultrafiltration bottom membrane.

[0071] In the organic phase solvent n-hexane of the interfacial polymerization reaction, add hydrophilic nanoparticles NaA type molecular sieve as an additive of the organic phase, and make a solution containing 0.4% of nanopartic...

Embodiment 2

[0073] Take by weighing 2.5g o-phenylenediamine and be mixed with 2.5% o-phenylenediamine aqueous solution, add 0.2g nano-particle carbon nanotube and be mixed with the aqueous phase solution that contains nano-particle concentration and be 0.2%, and 0.15% trimesoyl chloride Organic phase solution reaction, carry out interfacial polymerization on the prepared polysulfone ultrafiltration bottom membrane (prepared by phase inversion method in Example 1) to generate an active ultra-thin layer, which is heat-treated in a constant temperature heating box at 100-110°C to make The prepared active thin layer is stable, and the treated composite forward osmosis membrane is washed with deionized water to remove unreacted solvent to obtain a composite forward osmosis membrane, which is stored in deionized water for future use.

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Abstract

The invention discloses a composite forward osmosis membrane and a preparation method thereof. In the present invention, the casting solution is coated on the low-density non-woven fabric layer, and the porous support layer is obtained by phase inversion in the gel bath; then on the porous support layer, the polyamine aqueous solution reacts with the polyacyl chloride organic solution to form the ultra-thin separation layer, thereby obtaining a composite forward osmosis membrane with a three-layer structure comprising a low-density non-woven fabric layer, a porous support layer and an ultrathin separation layer. The invention reduces the thickness of the dense ultra-thin separation layer and improves the water flux through the hydrophilic modification of the porous support layer and the modification of the ultra-thin separation layer on the surface. The forward osmosis composite membrane prepared by the invention can be used in the forward osmosis process to obtain higher membrane flux and rejection rate.

Description

technical field [0001] The invention belongs to the field of preparation of polymer membranes for water treatment, and in particular relates to a preparation method of a composite forward osmosis (Forward Osmosis, FO) membrane used in a forward osmosis process. Background technique [0002] The forward osmosis membrane separation process is a membrane separation technology developed in recent years. Compared with the traditional pressure-driven membrane process, the forward osmosis process does not require external pressure, consumes less energy, and has a lower degree of pollution to the membrane. , The recovery rate of the process is high, and the environmental effect is friendly. Due to these advantages of the forward osmosis process, it has broad development space in the fields of seawater desalination, brackish water desalination, food concentration, power generation, and drug controlled release. [0003] The forward osmosis membrane is the core of the forward osmosis p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/10B01D67/00C02F1/44
Inventor 薛立新黄燕纪晓声朱红芳陈景
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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