Novel composite forward osmosis membrane and preparation method thereof

The technology of forward osmosis membrane and casting liquid is applied in the field of preparation of new composite forward osmosis membrane, which 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 flux. , good hydrophilic effect

Inactive Publication Date: 2013-07-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
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  • 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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  • Novel 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-dimethylacet...

Embodiment 1

[0070] Weigh 16g of polysulfone, dissolve it in 84g of mixed solvent composed of N,N-dimethylacetamide and PEG-400, and make 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 new bottom film casting solution with a montmorillonite concentration of 2%, and disperse in ultrasonic for 30 minutes to obtain a new bottom film with evenly dispersed nanoparticles Casting solution. A new type of bottom membrane casting solution is used on a low-density non-woven support layer, and a scraper with a certain thickness is used to scrape the membrane, and then put into a gel bath deionized water to form a gel film to obtain 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 sol...

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, interfacial polymerization reaction is carried out on the prepared polysulfone ultrafiltration bottom membrane (prepared by phase inversion method in Example 1) to generate a new active ultra-thin layer, which is heat-treated in a constant temperature heating box at 100-110 °C The prepared active thin layer is stabilized, and the treated composite forward osmosis membrane is rinsed with deionized water to remove unreacted solvent to obtain a novel composite forward osmosis membrane, which is stored in deionized water for future use.

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Abstract

The invention discloses a novel composite forward osmosis membrane and a preparation method thereof. The preparation method comprises the following steps: coating a casting solution on a low-density non-woven fabric and carrying out phase inversion in a gel bath so as to obtain a porous supporting layer; and allowing an aqueous solution of polyamine and an organic solution of polyacyl chloride to react on the porous supporting layer to form an ultrathin separating layer so as to obtain the composite forward osmosis membrane with a three-layer structure consisting of a low-density non-woven fabric layer, the porous supporting layer and the ultrathin separating layer. According to the invention, through hydrophilic modification of the porous supporting layer and modification of the ultrathin separating layer on the surface, the thickness of the compact ultrathin separating layer is reduced, and water flux is improved. The novel composite forward osmosis membrane prepared in the invention can be used in the process of forward osmosis and has high membrane flux and a high retention 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 novel composite forward osmosis (Forward Osmosis, FO) membrane used in a forward osmosis process. Background technique [0002] The forward osmosis membrane separation process is a new type of 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 less pollution to the membrane. 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 process, and its performance determines whether the forward osmosis process can be...

Claims

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Application Information

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Patent Type & Authority Applications(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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