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Preparation method of low-desalination-rate composite nanofiltration membrane

A technology of composite nanofiltration membrane and desalination rate, which is applied in the field of nanofiltration membrane, can solve the problems of unfavorable application of nanofiltration membrane, large flux of nanofiltration membrane, lack of desalination rate, etc., and achieves good industrial applicability, simple process, surface smooth effect

Inactive Publication Date: 2016-05-04
VONTRON MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, interfacial polymerization is usually used to prepare composite nanofiltration membranes. The surface of the obtained nanofiltration membranes is generally negatively charged, and the removal rate of monovalent ions is limited. For example, polypiperazineamide composite nanofiltration membranes The removal rate of NaCl is between 10% and 50%, while the removal rate of NaCl by polyamide composite nanofiltration membrane is between 90% and 99%. Moreover, today's nanofiltration membranes basically have the common disadvantages of large flux and easy pollution, which is not conducive to the wider application of nanofiltration membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of polymer solution: Disperse 18 g of polysulfone in 82 g of N-methylpyrrolidone, stir at high speed for 8 hours, then raise the temperature to 120°C, perform high-temperature defoaming of the obtained solution, and then cool down to 35°C to obtain a polymer solution.

[0028] (2) Forming a porous polymer support layer: the polymer solution in step (1) is subjected to a liquid-solid phase conversion method to prepare a porous polymer support layer.

[0029] (3) Dissolve 45g2,3-cyclohexanediamine and 2g sodium hydroxide in 953g deionized water, stir and dissolve to obtain A solution completely; soak the porous polymer support layer prepared in step (2) in A solution for 8s ,, Drain the water droplets on the film surface.

[0030] (4) Dissolve 2.0 g of trimesoyl chloride in 998 g of n-octane, stir and dissolve to obtain solution B; soak the porous polymer support layer soaked in solution A in step (3) in solution B for 10 s.

[0031] (5) After the solvent...

Embodiment 2

[0033] (1) Preparation of polymer solution: Disperse 18g of polyimide in 82g of N,N-dimethylacetamide, stir at high speed for 6 hours and then raise the temperature to 100°C. The resulting solution is degassed at high temperature, and then cooled to 20°C to obtain polymer solution.

[0034] (2) Forming a porous polymer support layer: the polymer solution in step (1) is subjected to a liquid-solid phase conversion method to prepare a porous polymer support layer.

[0035] (3) 45g2,3-cyclohexanediamine and 4g sodium hydroxide are dissolved in 951g ultrapure water, stir and dissolve to obtain A solution completely; The porous polymer support layer prepared in step (2) is soaked in A solution 50s, drain the water droplets on the membrane surface.

[0036] (4) Dissolve 2.0 g of trimesoyl chloride in 998 g of ISOPAR-G, stir and dissolve to obtain solution B; soak the porous polymer support layer soaked in solution A in step (3) in solution B for 20 s.

[0037] (5) After the solven...

Embodiment 3

[0039] (1) Preparation of polymer solution: Disperse 18 g of polypropylene in 82 g of N-methylpyrrolidone, stir at high speed for 10 hours, then heat up to 80°C, perform high-temperature defoaming of the obtained solution, and then cool down to 10°C to obtain a polymer solution.

[0040] (2) Forming a porous polymer support layer: the polymer solution in step (1) is subjected to a liquid-solid phase conversion method to prepare a porous polymer support layer.

[0041] (3) 50g cyclohexylamine, 50g p-phenylenediamine and 2g sodium hydroxide are dissolved in 898g deionized water, stir and dissolve to obtain A solution completely; The porous polymer supporting layer prepared in step (2) is in A solution Soak for 15s, drain the water droplets on the film surface.

[0042] (4) Dissolve 2.0 g of trimesoyl chloride in 998 g of n-hexane, stir and dissolve to obtain solution B; soak the porous polymer support layer soaked in solution A in step (3) in solution B for 50 s.

[0043] (5) A...

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Abstract

The invention belongs to the technical field of a nanofiltration membrane, and particularly relates to a preparation method of a low-desalination-rate composite nanofiltration membrane, which is a porous polymer supporting layer provided with at least one layer of polyamide. The porous polymer supporting layer is prepared from a polymer solution produced from one polymer of polysulfone, polyethersulfone, polyimide, polypropylene, polyacetate fiber, or a halogenated polymer through a liquid-solid phase inversion method. The polyamide layer is formed by a solution A and a solution B on the porous polymer supporting layer in sequence through an interface reaction. The nanofiltration membrane has a NaCl desalination rate in a range of 50-90%, and fills the blank between super-low-desalination-rate polypiperazine-amide composite nanofiltration membrane and a high-desalination-rate polyamide composite nanofiltration membrane. The method has characteristics of simple operation and process and excellent industrial practicability.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiltration membrane with a low desalination rate, and belongs to the technical field of nanofiltration membranes. Background technique [0002] Nanofiltration membrane is a new separation technology between ultrafiltration and reverse osmosis. Its technical feature is to achieve selective permeation of dissolved components through steric hindrance and electrostatic interaction. Nanofiltration membranes are widely used in practical applications. With the development of economy and the improvement of social living standards, nanofiltration will be used in the purification and concentration of water quality, water softening, dyes, pigments, drugs and bioengineering products. It has been well applied in deep separation of oil and water and decolorization of wastewater (liquid) in printing and dyeing, textile, chemical and pharmaceutical industries, and different fields have different requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/10B01D69/12B01D71/56
CPCB01D71/56B01D67/0006B01D69/02B01D69/10B01D69/122B01D2323/12B01D2323/46
Inventor 梁松苗方俊许国杨金焱吴宗策蔡志奇
Owner VONTRON MEMBRANE TECH CO LTD
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