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Preparation method of composite nanofiltration membrane and composite nanofiltration membrane prepared therefrom

A technology of composite nanofiltration membrane and membrane casting liquid, applied in the field of nanofiltration membrane, can solve the problems of complex preparation process, poor solvent resistance, low process requirements, etc., and achieve low process requirements, high flux and interception performance, and raw material cost. low effect

Active Publication Date: 2021-12-14
VONTRON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] In order to solve the problems of poor solvent resistance, complex preparation process and high cost of existing nanofiltration membranes, improve the application range of nanofiltration membranes in organic solvents, and ensure high flux and rejection rates at the same time, this application uses aliphatic polymer The solvent-resistant composite nanofiltration membrane is prepared by interfacial polymerization with amide as the support layer. The cross-linking step is omitted in the membrane-making process, and the membrane-forming process is simplified. It can be realized on the existing membrane-making equipment, and the process requirements are low. The cost of raw materials is low, and the resulting composite nanofiltration membrane has high flux and rejection in polar organic solvents

Method used

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  • Preparation method of composite nanofiltration membrane and composite nanofiltration membrane prepared therefrom
  • Preparation method of composite nanofiltration membrane and composite nanofiltration membrane prepared therefrom
  • Preparation method of composite nanofiltration membrane and composite nanofiltration membrane prepared therefrom

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preparation example Construction

[0046] One aspect of the present invention relates to a preparation method of a composite nanofiltration membrane, and another aspect relates to a composite nanofiltration membrane.

[0047] 1, the preparation method of composite nanofiltration membrane of the present invention

[0048] As the preparation method of composite nanofiltration membrane of the present invention, specifically comprise the following steps:

[0049] (1) preparing an aliphatic polyamide solution as a casting solution, making the casting solution solidify and form a film on the reinforcing material;

[0050] (2) immersing the film obtained in step (1) in a heat treatment solution;

[0051] (3) immersing the film obtained in step (2) in an aqueous phase solution containing an amine compound, and then immersing the film in an organic phase solution containing an acid chloride compound;

[0052] (4) Obtain the composite nanofiltration membrane after post-treatment and drying.

[0053] Preferably, the al...

Embodiment 1

[0106] (1) Under nitrogen protection, add 10g of lithium chloride and 10g of calcium chloride to 144g of methanol, heat and stir at 55°C for 1 hour until dissolved; then add 36g of polyamide 6 particles to the above solution, at 55 After stirring at ℃ for 10 hours, the polyamide particles were completely dissolved to form a homogeneous aliphatic polyamide casting solution with a mass fraction of 18%; the homogeneous polyamide casting solution was evenly scraped on the surface of the PP non-woven fabric with a scraper machine , and then quickly immersed in 10wt.% methanol aqueous solution at 10°C, and solidified for 5 minutes;

[0107] (2) immerse the membrane in pure water at 80°C, and heat-treat it for 10 minutes to obtain a membrane with an aliphatic polyamide support layer;

[0108] (3) Dissolve 10g m-phenylenediamine, 10g p-phenylenediamine, 2g sodium dodecylbenzenesulfonate, and 2g sodium carbonate in 976g pure water, stir for 30 minutes until it dissolves completely, as ...

Embodiment 2

[0111] (1) Under nitrogen protection, add 10g of lithium chloride and 10g of calcium chloride to 144g of methanol, heat and stir at 55°C for 1 hour until dissolved; then add 36g of polyamide 6 particles to the above solution, at 55 After stirring at ℃ for 10 hours, the polyamide particles were completely dissolved to form a homogeneous aliphatic polyamide casting solution with a mass fraction of 18%; the homogeneous polyamide casting solution was evenly scraped on the surface of the PP non-woven fabric with a scraper machine , and then quickly immersed in 10wt.% methanol aqueous solution at 10°C, and solidified for 5 minutes;

[0112] (2) immerse the membrane in pure water at 80°C, and heat-treat it for 10 minutes to obtain a membrane with an aliphatic polyamide support layer;

[0113] (3) Dissolve 10g of m-phenylenediamine, 10g of piperazine, 2g of sodium dodecylbenzenesulfonate, and 2g of sodium carbonate in 976g of pure water, and stir for 30 minutes until it is completely ...

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Abstract

The application relates to a preparation method of a composite nanofiltration membrane and a composite nanofiltration membrane prepared therefrom. The preparation method of the composite nanofiltration membrane comprises the following steps: preparing an aliphatic polyamide solution as a casting solution, and solidifying the casting solution on a reinforcing material to form a film; immersing the obtained film in a heat treatment solution; The membrane is immersed in an aqueous phase solution containing amine compounds, and then immersed in an organic phase solution containing acid chloride compounds; after post-treatment and drying, a composite nanofiltration membrane is obtained. The composite nanofiltration membrane has high flux and retention performance in polar organic solvents. The film not only has long-term stability in general organic solvents such as alcohols, ketones, esters, hydrocarbons, etc., but also has long-term stability in strong polar aprotic solvents such as DMF, DMAc, NMP, DMSO, etc. sex. The film has potential application value in chemical industry, pharmacy, food and other fields.

Description

technical field [0001] The present application relates to the technical field of nanofiltration membranes, in particular to a method for preparing a composite nanofiltration membrane and the composite nanofiltration membrane prepared therefrom. The composite nanofiltration membrane prepared by this method not only has long-term stability in general organic solvents (such as alcohols, ketones, esters, hydrocarbons, etc.), but also has long-term stability in strong polar aprotic solvents (such as N, N- Dimethylformamide DMF, dimethylformamide DMAC, N-methylpyrrolidone NMP, dimethyl sulfoxide DMSO, etc.) also have long-term stability, and the composite nanofiltration membrane maintains higher flux and retention rate. Background technique [0002] Solvent-resistant nanofiltration (SRNF) or organic solvent nanofiltration (OSF) refers to a membrane separation technology that realizes molecular-level separation of solvents in organic solvents through pressure-driven. Small solven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/12B01D71/10B01D71/38B01D71/42B01D71/56B01D71/64B01D71/66B01D71/68B01D71/70
Inventor 王志亮梁松苗金焱吴宗策
Owner VONTRON TECH CO LTD
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