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Preparation method of pollution-resistant low-pressure nanofiltration membrane

A nanofiltration membrane and pollution-resistant technology, which is applied in the field of preparation of pollution-resistant low-pressure nanofiltration membranes, can solve the problem of low flux and achieve the effects of simple preparation process, low production cost and excellent performance

Active Publication Date: 2012-07-18
浙江美易膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using polyvinyl alcohol as the film-forming material, it is directly coated on the surface of the polysulfone ultrafiltration membrane, and then cross-linked and solidified to form a composite nanofiltration membrane (J Colloid Interface Sci. 2009, 338, 121–127). This type of membrane has good Fouling resistance, but the flux of the membrane is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a reaction kettle equipped with 60 g / L of polyvinyl alcohol aqueous solution with a degree of hydrolysis of 88%, add N,N-dimethyl N-(2-methacryloyloxyethyl) with a concentration of 5% by mass ) N-(2-sulfoethyl) ammonium, under the protection of nitrogen, add potassium persulfate-sodium bisulfite with a mass percentage concentration of 1.5% (the mass ratio of potassium persulfate to sodium bisulfite is 1.0:2.0), React at 25°C for 12 hours, the reaction product is precipitated with methanol, washed, dried at 40°C for 6 hours, and pulverized to obtain polyvinyl alcohol grafted zwitterionic copolymer.

[0023] Soak the polyacrylonitrile porous membrane in 1 wt / v % sodium hydroxide aqueous solution at 30°C for 60 minutes, wash it with distilled water three times, and dry it at 20°C; %piperazine and 0.02 wt / v% of the above-prepared polyvinyl alcohol grafted amphoteric ion copolymer aqueous phase solution, soaked for 2 minutes, took out and excluded the excess solution on t...

Embodiment 2

[0026] In a reaction kettle equipped with 60 g / L polyvinyl alcohol aqueous solution with a degree of hydrolysis of 99%, add N,N-dimethyl N-(2-methacryloyloxyethyl) with a concentration of 15% by mass N-(2-sulfoethyl) ammonium, under the protection of nitrogen, add potassium persulfate-sodium bisulfite with a mass percentage concentration of 5% (the mass ratio of potassium persulfate to sodium bisulfite is 1.0:1.0), in React at 50°C for 6 hours, and the reaction product is precipitated with methanol, washed, dried at 60°C for 3 hours, and pulverized to obtain a polyvinyl alcohol grafted amphoteric ion copolymer.

[0027] The polyacrylonitrile porous membrane was soaked in 10wt / v% sodium hydroxide aqueous solution at 50°C for 15 minutes, washed 3 times with distilled water, and dried at 20°C; then immersed in a solution containing 2wt / v% In the water phase solution of piperazine and 0.15 wt / v% polyvinyl alcohol grafted zwitterionic copolymer prepared above, soak for 5 minutes, t...

Embodiment 3

[0030] In a reaction kettle equipped with 60 g / L polyvinyl alcohol aqueous solution with a degree of hydrolysis of 99%, add N,N-dimethyl N-(2-methacryloyloxyethyl) with a concentration of 8% by mass N-(2-sulfoethyl) ammonium, under the protection of nitrogen, add potassium persulfate-sodium bisulfite with a mass percentage concentration of 2% (the mass ratio of potassium persulfate to sodium bisulfite is 1.0:2.0), in React at 40°C for 8 hours, and the reaction product is precipitated with methanol, washed, dried at 50°C for 4 hours, and pulverized to obtain a polyvinyl alcohol grafted zwitterionic copolymer.

[0031] Soak the polyacrylonitrile porous membrane in 5wt / v% sodium hydroxide aqueous solution at 40°C for 30 minutes, wash it with distilled water 5 times, and dry it at 25°C; In the water phase solution of piperazine and 0.1 wt / v% polyvinyl alcohol graft zwitterionic copolymer prepared above, soak for 3 minutes, take out and get rid of the excess solution on the surface...

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Abstract

The invention relates to a preparation method of a pollution-resistant low-pressure nanofiltration membrane, belonging to the technical field of water treatment nanofiltration membrane separation. The preparation method comprises the steps of: grafting a zwitter-ion copolymer and polyamine and poly acyl chloride monomers through polyvinyl alcohol for interface polymerization; and forming a composite nanofiltration membrane of a polyamide functional layer containing zwitter-ion groups on a polyacrylonitrile porous support membrane. By adopting an interface polymerization membrane, the pollution-resistant low-pressure nanofiltration membrane is introduced into a polyimide nanofiltration membrane in situ, and the characteristics of zwitter-ion hydrophilcity and pollution resistance are effectively combined with the characteristics of convenience and rapidness for making the membrane through interface polymerization with polyimide. The pollution-resistant low-pressure nanofiltration membrane has excellent performance, simple preparation process, lower production cost and excellent industrial applicability.

Description

technical field [0001] The invention belongs to the technical field of nanofiltration membrane separation for water treatment, and in particular relates to a preparation method of a pollution-resistant low-pressure nanofiltration membrane. Background technique [0002] Nanofiltration membrane is a pressure-driven membrane separation process between ultrafiltration and reverse osmosis, and has become a hot spot in the research of membrane separation technology. Its rejection rate for monovalent ions is generally lower than 50%, but its rejection rate for divalent or multivalent ions and organic molecules (molecular weight between 200 and 1000) is greater than 90%. With its unique separation effect, nanofiltration membrane has been widely used in the separation and purification of substances in water softening, wastewater treatment, biopharmaceutical, petrochemical and other fields. In addition to the above-mentioned application fields, the use of nanofiltration membranes in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/78B01D71/56B01D71/42B01D67/00B01D69/10B01D69/12
Inventor 陈楚龙
Owner 浙江美易膜科技有限公司
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