Method for synchronously preparing hollow fiber compound nanofiltration membrane through immersion precipitation phase inversion/interface crosslinking

A technology of immersion precipitated phase and interfacial crosslinking, which is applied in the field of synchronous preparation of hollow fiber composite nanofiltration membranes by immersion precipitated phase inversion/interface crosslinking, can solve the problems that limit the development of hollow fiber composite nanofiltration membranes, and achieve simple and easy performance , simple process and strong controllability

Inactive Publication Date: 2012-12-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction of the hollow fiber nanofiltration membrane composite layer reported so far is mostly based on the existing membrane material. Although it is superior to the flat membrane in terms of anti

Method used

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  • Method for synchronously preparing hollow fiber compound nanofiltration membrane through immersion precipitation phase inversion/interface crosslinking
  • Method for synchronously preparing hollow fiber compound nanofiltration membrane through immersion precipitation phase inversion/interface crosslinking
  • Method for synchronously preparing hollow fiber compound nanofiltration membrane through immersion precipitation phase inversion/interface crosslinking

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Select polyvinylidene fluoride and polyvinylpyrrolidone with a mass ratio of 10:1:1 (the number average molecular weight is 1×10 3 ) and p-dichlorobenzyl, mixed with DMF, stirred and dissolved at 50°C to form a homogeneous solution, left standing for defoaming, to obtain a film casting solution with a mass percentage concentration of polyvinylidene fluoride of 15%; at 40°C, PDMAEMA Stir and dissolve in water, prepare a PDMAEMA aqueous solution with a concentration of 5g / L, let it stand for defoaming, and use it as the core liquid. The casting liquid and the core liquid are simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device under the pressure of 0.1 MPa and the spinning speed of 10 m / min to form a tubular liquid film, and the tubular liquid film passes through 1 cm of air After the gap, it enters a coagulation bath of 30°C water to make a hollow fiber nanofiltration membrane, and after soaking and wash...

Embodiment 2

[0040] Select polyvinylidene fluoride and polyvinylpyrrolidone with a mass ratio of 20:5:5 (the number average molecular weight is 3×10 3 ) and p-dichlorobenzyl, mixed with DMSO, stirred and dissolved at 70°C to form a uniform solution, left to defoam, and obtained a casting solution with a mass percentage concentration of polyvinylidene fluoride of 25%; at 60°C, PEI Stir and dissolve in water, prepare a PEI aqueous solution with a concentration of 15g / L, let it stand for defoaming, and use it as the core liquid. The casting liquid and the core liquid are simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device under the pressure of 0.1 MPa and the spinning speed of 10 m / min to form a tubular liquid film, and the tubular liquid film passes through 1 cm of air After the gap, it enters a coagulation bath of 50°C water to make a hollow fiber nanofiltration membrane, and after soaking and washing in 15°C water for 48 ...

Embodiment 3

[0043] Select polyvinylidene fluoride, polyethylene glycol (number-average molecular weight: 100) and glutaraldehyde with a mass ratio of 30:10:2, mix them with DMAc, stir and dissolve at 50°C to form a uniform solution, let stand for defoaming, Obtain a casting liquid with a concentration of polyvinylidene fluoride of 35% by mass; stir and dissolve PEI in water at 40° C. to prepare a PEI aqueous solution with a concentration of 10 g / L, and let it stand for defoaming as a core liquid. The casting liquid and the core liquid are simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device under the pressure of 0.3 MPa and the spinning speed of 20 m / min to form a tubular liquid film, and the tubular liquid film passes through 5 cm of air After the gap, enter the coagulation bath of 30°C water to make a hollow fiber nanofiltration membrane, and after soaking and washing in 15°C water for 48 hours, a polyvinylidene fluoride...

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Abstract

The invention discloses a method for synchronously preparing a hollow fiber compound nanofiltration membrane through immersion precipitation phase inversion/interface crosslinking. The method comprises the following steps of: mixing a polymer, a pore diameter regulator and crosslinking agent with an organic solvent, and dissolving into a uniform solution at the temperature of 30-70 DEG C to obtain a membrane casting liquid; (2) dissolving a crosslinking prepolymer into water at the temperature of 20-60 DEG C to obtain 1-15g/L of solution, i.e., a core liquid; and (3) extruding the membrane casting liquid and the core liquid into a tubular liquid membrane under the pressure of 0.1-0.3MPa and at the spinning speed of 10-40 meters per minute, introducing into a coagulation bath of 26-60 DEG C through an air gap of 0-20 centimeters, and soaking and cleaning with water to obtain a hollow fiber compound nanofiltration membrane. Compared with the existing nanofiltration membrane preparation technology, the method has the advantages that: molding and interface crosslinking of a base membrane of the hollow fiber compound nanofiltration membrane are finished synchronously in the method, a nanofiltration compound layer is stable and has high controllability, the using amount of the polymer is saved, a process is simple, and clean production can be realized.

Description

technical field [0001] The invention relates to the technical field of preparation of separation membranes, in particular to a method for synchronously preparing hollow fiber composite nanofiltration membranes by immersion precipitation phase inversion / interface crosslinking. Background technique [0002] Nanofiltration membrane is a new type of separation membrane with a pore size between ultrafiltration membrane and reverse osmosis membrane. The high rejection rate and simultaneous desalination and concentration have incomparable advantages in the separation and concentration of organic / inorganic mixed liquids. Therefore, nanofiltration membrane technology is widely used in the deep purification of drinking water, industrial water softening, wastewater treatment, concentration and purification of active ingredients in pharmaceuticals and food, etc. [0003] The composite method of composite nanofiltration layer on the porous base membrane is the most widely used and most ...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D67/00B01D69/08B01D69/12
Inventor 徐志康胡梦欣吴青芸
Owner ZHEJIANG UNIV
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