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Novel high-flux positively charged nanofiltration membrane and preparation method thereof

A positively charged, high-flux technology, applied in the field of membrane separation, can solve the problems of positively charged nanofiltration membrane preparation time and low water flux, and achieve the effects of low preparation cost, stable performance, and increased porosity

Active Publication Date: 2021-08-17
蓝星(杭州)膜工业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Novel high-flux positively charged nanofiltration membrane and preparation method thereof
  • Novel high-flux positively charged nanofiltration membrane and preparation method thereof
  • Novel high-flux positively charged nanofiltration membrane and preparation method thereof

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preparation example Construction

[0051] 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, the preparation method comprising the following steps:

[0052] S1: Prepare the aqueous phase solution: add surfactant and proton acceptor to the aqueous solution containing the hydrophilic group polyamine monomer, mix well; the hydrophilic group polyamine monomer is 2,4-diamino -6-phenyl-1,3,5-triazine, 1,3-bis(aminomethyl)cyclohexane, tris(hydroxymethyl)aminomethane, N-aminophthalimide and 2, At least one of 4-dimethoxybenzylamine; the mass concentration of the hydrophilic polyamine monomer in the aqueous phase solution is 0.5%-5%; the mass concentration of the proton accepting agent in the aqueous phase solution is 1 %-5%; the mass concentration of the surfactant in the aqueous phase solution is 0.1%-5%; preferably 0.1%-3%;

[0053] S2: Immerse the porous support layer in the water pha...

Embodiment 1

[0061] A novel high-flux positively charged nanofiltration membrane preparation method:

[0062] S1: Configure the aqueous phase solution: add trisodium phosphate and sodium lauryl sulfate to the aqueous solution of N-aminophthalimide, and mix well; N-aminophthalimide in the aqueous phase solution The mass concentration of trisodium phosphate is 0.5%, the mass concentration of trisodium phosphate is 3%, and the mass concentration of sodium lauryl sulfate is 3%;

[0063] S2: Immerse the porous support ultrafiltration bottom membrane in the water phase solution of S1 for 60s, remove the excess water phase solution on the surface of the porous support ultrafiltration bottom membrane with a roller; then immerse the porous support layer in the oil phase solution containing acid chloride monomer for 20s Interface reaction, take out and drain the excess oil phase solution on the surface of the membrane, continue to heat treatment at a temperature of 90 °C for 4 minutes, and spray a v...

Embodiment 2

[0065] A novel high-flux positively charged nanofiltration membrane preparation method:

[0066] The mass concentration of sodium lauryl sulfate in step S1 is 0.1%;

[0067] All the other steps are the same as in Example 1.

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Abstract

The invention relates to a novel high-flux positively charged nanofiltration membrane and a preparation method thereof. The novel high-flux positively charged nanofiltration membrane comprises a porous supporting layer and a positively charged nanofiltration selection layer; the positively charged nanofiltration selection layer is formed by carrying out interfacial polymerization reaction on a water phase solution and an oil phase solution and then carrying out heat treatment; the water phase solution is a water solution containing a hydrophilic polyamine monomer and an water phase additive, and the water phase additive comprises a surfactant and a proton receiving agent; the oil phase solution is a solution obtained by dissolving an acyl chloride monomer in an organic solvent. The nanofiltration membrane prepared by the preparation method is large in flux, stable in performance, high in desalting rate and relatively high in positive ion removal rate. In addition, the preparation method is simple and easy to control, relatively good in reproducibility, short in preparation time and low in preparation cost, and is favorable for realizing the production of the industrial high-flux positively charged nanofiltration membrane.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a novel high-throughput positively charged nanofiltration membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a new type of separation technology with high efficiency and environmental protection. 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 the fields of food production and processing, industrial sewage treatment, industrial gas separation and petrochemical products production. important role. [0003] Nanofiltration membrane technology is especially suitable for separating high-valent ions and organic compounds with a molecular weight of several hundred. Due to the low operating pressure of nanofiltration membrane technology during separation, it is widely used in medicine, food, chemical p...

Claims

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Application Information

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Patent Type & Authority Applications(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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