Supermolecule composite nanofiltration membrane and preparation method and application thereof

A composite nanofiltration membrane and supramolecular technology, applied in chemical instruments and methods, membrane, membrane technology and other directions, can solve the problems of low yield and complex production process.

Active Publication Date: 2017-05-31
南京蔚华膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vitamin B12 is obtained by fermentation, the traditional production process is complicated and the yield is low

Method used

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  • Supermolecule composite nanofiltration membrane and preparation method and application thereof
  • Supermolecule composite nanofiltration membrane and preparation method and application thereof
  • Supermolecule composite nanofiltration membrane and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Preparation of polyimide base film

[0052] ⑴ Dissolve polyimide (P84) and polyethylene glycol 400 (PEG) in N-methylpyrrolidone (NMP) solvent in a certain mass ratio, the mass ratio of P84, PEG and NMP is 20:12:50, Stir mechanically at room temperature of 25°C for 20-24 hours, and after it is completely dissolved, let it stand for 8-12 hours for degassing treatment to obtain the casting solution;

[0053] (2) Fix the polyester non-woven fabric on the glass plate, control the thickness of the scraper to 100 μm, scrape and coat the casting solution on the polyester non-woven fabric, control the volatilization time for 5-10 seconds, immerse in the water coagulation bath, and phase Separate and solidify to form a film, take it out after soaking for 5 minutes to obtain a wet polyimide film, and store the prepared base film in deionized water.

[0054] The prepared polyimide nanofiltration membrane base layer was used for the preparation of the modification layer i...

Embodiment 2

[0055] The preparation of embodiment 2 polyethersulfone base membrane

[0056] ⑴ Dissolve polyethersulfone and polyethylene glycol 400 (PEG) in N-methylpyrrolidone (NMP) solvent in a certain mass ratio, the mass ratio of P84, PEG and NMP is 20:12:50, at 25°C Under mechanical stirring for 20-24 hours, after it is completely dissolved, let it stand for 8-12 hours for degassing treatment, and the obtained casting solution;

[0057] (2) Fix the polyester non-woven fabric on the glass plate, control the thickness of the scraper to 100 μm, scrape and coat the casting solution on the polyester non-woven fabric, control the volatilization time for 5-10 seconds, immerse in the water coagulation bath, and phase Separate and solidify to form a film, take it out after soaking for 5 minutes to obtain a wet polyethersulfone film, and store the prepared base film in deionized water.

[0058] The prepared polyethersulfone-based membrane was used for the preparation of the modified layer in t...

Embodiment 3

[0059] The preparation of the polyimide composite film of embodiment 3 cucurbituril modification

[0060] Prepare 2wt% anhydrous piperazine (PIP) aqueous phase solution, add 0.1wt% cucurbitacin 6 (CB6), stir until completely dissolved, as the first phase;

[0061] Preparation of 0.1 wt% trimesoyl chloride organic phase solution, organic solvent is n-hexane, as the second phase;

[0062] Fix the polyimide base film on the interface polymerization device, pour a certain amount of the first phase solution to immerse the surface of the film, make it contact with the surface for 120 seconds, take it out, and then roll the polyimide support film with a rubber roller, Remove excess solution, pour an equal amount of the second phase, soak for 60 seconds, rinse the surface with n-hexane solution after the reaction is complete, remove excess reactants and store in pure water for later use.

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Abstract

The invention relates to a supermolecule composite nanofiltration membrane and preparation method and application thereof. The nanofiltration membrane mainly comprises a base layer and a modification layer on the base layer, wherein cucurbituril is distributed in the modifying layer. The preparation method comprises the following steps: preparing a base membrane solution; mechanically stirring until the base membrane is completely dissolved; standing to remove bubbles; scrapping on a nonwoven fabric to form a flat membrane; preparing aqueous solution of a first monomer and an organic solution of a second monomer; adding supermolecule to the first monomer aqueous solution, and stirring to dissolve; performing interfacial polymerization on the base membrane surface; and transferring the prepared membrane in deionized water to store for later use. The preparation method has the characteristics that the supermolecule is used as an interfacial polymerization, the preparation processes are simple; the prepared supermolecule composite nanofiltration membrane is high in flux and high in rejection rate.

Description

technical field [0001] The invention relates to a supramolecular composite nanofiltration membrane, a preparation method and application thereof, and belongs to the technical field of polymer membranes. Background technique [0002] Nanofiltration (NF) is a new type of membrane separation technology between reverse osmosis and ultrafiltration developed in the late 1980s. It was called "low pressure reverse osmosis" or "loose reverse osmosis" in the early days. Nanofiltration technology is a new type of pressure-driven membrane process developed to meet the needs of industrial softened water and reduce costs. The molecular weight cut-off of the nanofiltration membrane is between 200-1000. The membrane pore size is about 1nm, which is suitable for separating dissolved components with a size of about 1nm, so it is called "nanofiltration". Due to the special pore size range of the nanofiltration membrane and the special treatment (composite, charged) during preparation, it h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D69/12B01D67/00C02F1/44C02F101/38C02F101/36C02F101/20C02F101/16
CPCB01D61/027B01D69/12B01D69/125B01D2325/26B01D2325/38C02F1/442C02F2101/101C02F2101/163C02F2101/20C02F2101/36C02F2101/38C02F2101/40
Inventor 孙世鹏郭家林王珏陈伯志邢卫红徐南平
Owner 南京蔚华膜科技有限公司
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