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A high-throughput positively charged nanofiltration membrane and preparation method thereof

A technology for positively charged and nanofiltration membranes, applied in the field of high-throughput positively charged nanofiltration membranes and their preparation, can solve the problems of the preparation time and low water flux of positively charged nanofiltration membranes, and achieve low production costs , short preparation time and good reproducibility

Active Publication Date: 2022-06-24
蓝星(杭州)膜工业有限公司
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a novel high-throughput positively charged nanofiltration membrane and a preparation method thereof, which solves the problems of the existing positively charged nanofiltration membranes with low preparation time and water flux. technical issues

Method used

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  • A high-throughput positively charged nanofiltration membrane and preparation method thereof
  • A high-throughput positively charged nanofiltration membrane and preparation method thereof
  • A high-throughput positively charged nanofiltration membrane and preparation method thereof

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preparation example Construction

[0052] The novel high-flux positively-charged nanofiltration membrane of the present invention is obtained by a novel high-flux positively-charged nanofiltration membrane preparation method, and the preparation method comprises the following steps:

[0053] S1: Prepare aqueous solution: add surfactant and proton acceptor to the aqueous solution containing hydrophilic amine monomers, and mix evenly; the hydrophilic amine monomer is 2,4-diamino-6-benzene yl-1,3,5triazine, 1,3-bis(aminomethyl)cyclohexane, tris(hydroxymethyl)aminomethane, N-aminophthalimide and 2,4-dimethyl At least one of oxybenzylamine; the mass concentration of the hydrophilic amine monomer in the aqueous solution is 0.5%-5%; the mass concentration of the proton acceptor in the aqueous solution is 1%-5% ; The mass concentration of the surfactant in the aqueous solution is 0.1%-5%; preferably 0.1%-3%;

[0054] S2: Immerse the porous support layer in the aqueous phase solution, let stand for 30-90s, and remove t...

Embodiment 1

[0062] A novel preparation method of high-flux positively charged nanofiltration membrane:

[0063] S1: Configure the aqueous phase solution: add trisodium phosphate and sodium dodecyl sulfate to the aqueous solution of N-aminophthalimide, and mix evenly; N-aminophthalimide in the aqueous phase solution The mass concentration of sodium lauryl sulfate is 0.5%, the mass concentration of trisodium phosphate is 3%, and the mass concentration of sodium lauryl sulfate is 3%;

[0064] S2: Immerse the porous support ultrafiltration bottom membrane in the aqueous phase solution of S1 for 60s, and remove the excess water phase solution on the surface of the porous support ultrafiltration bottom membrane with rollers; then immerse the porous support layer in the oil phase solution containing acid chloride monomers for 20s. interface reaction, take out and drain off the excess oil phase solution on the surface of the membrane, continue to heat treatment at 90 ° C for 4 min, and spray extr...

Embodiment 2

[0066] A novel preparation method of high-flux positively charged nanofiltration membrane:

[0067] In step S1, the mass concentration of sodium lauryl sulfate is 0.1%;

[0068] The rest of the steps are the same as in Example 1.

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Abstract

The invention relates to a novel high-throughput positively charged nanofiltration membrane and a preparation method thereof. The novel high-flux positively charged nanofiltration membrane includes a porous support layer and a positively charged nanofiltration selective layer; the positively charged nanofiltration selective layer is formed by interfacial polymerization of an aqueous phase solution and an oil phase solution and then subjected to heat treatment The aqueous phase solution is an aqueous solution containing a hydrophilic polyamine monomer and an aqueous phase additive, and the aqueous phase additive includes a surfactant and a proton accepting agent; the oil phase solution is an acid chloride monomer dissolved in an organic solvent solution. The nanofiltration membrane prepared by the preparation method of the invention has large flux, stable performance, high salt removal rate and high removal rate for positive ions. In addition, the preparation method provided by the invention is simple and easy to control, has good reproducibility, short preparation time, and low preparation cost, which is beneficial to realize the production of industrialized high-throughput positively charged nanofiltration membranes.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a high-flux positively charged nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a new type of high-efficiency and environmentally friendly separation technology, and it is also one of the continuously developing strategic emerging industries and one of the major common technologies. Membrane separation technology is widely used in food production and processing, industrial sewage treatment, industrial gas separation and petrochemical product production. important role. [0003] Nanofiltration membrane technology is particularly suitable for separating high-valent ions and organic compounds with molecular weights of several hundreds. Due to the low operating pressure of nanofiltration membrane technology during separation, it is widely used in medicine, food, chemical product concentration and e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D69/02C02F1/44C02F101/10C02F101/30C02F103/00C02F103/34
CPCB01D69/125B01D69/02C02F1/442C02F2101/308C02F2101/10C02F2103/007C02F2103/343
Inventor 施盈盈谭惠芬程新陈可可潘巧明
Owner 蓝星(杭州)膜工业有限公司
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