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Method for preparing composite nanofiltration membrane

A composite nanofiltration membrane and base membrane technology, applied in the field of membrane separation, can solve the problems of high reaction kinetic constant, many side reactions, high selection of base membrane, etc., and achieve the effects of convenient operation, simple process and excellent performance.

Inactive Publication Date: 2007-10-17
SHANGHAI UNIV
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Problems solved by technology

However, this method also has its disadvantages, such as high requirements for the selection of the base film; the reaction kinetic constant is high but controlled by diffusion; there are many side reactions; Effective control of structure and performance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation steps of this embodiment are as follows:

[0018] (1) Clean the polyethersulfone base membrane with pure water, then soak it in pure water for 8 hours, and change the water every 2 hours in the middle;

[0019] (2) immerse the above-mentioned processed basement film in the sodium polystyrene sulfonate solution with a concentration of 0.05mol / L, that is, in the polyanion solution, the solution contains 0.5mol / L of NaCl, and its pH value is 2.1, Soak for 20 minutes, then wash with pure water, then soak for another 20 minutes;

[0020] (3) The above-mentioned polyethersulfone base membrane treated with the polyanion solution is immersed in the polydiallyldimethylammonium chloride solution with a concentration of 0.05mol / L, that is, the polycation solution, which contains 0.5 mol / L NaCl, its pH value is 5.8, soaked for 20 minutes, then washed with pure water, and then soaked for 20 minutes;

[0021] (4) The above-mentioned polyethersulfone-based membranes ...

Embodiment 2

[0023] The preparation steps of this example are the same as those of Example 1 above. Its preparation steps are as follows:

[0024] (1) Clean the polyethersulfone base membrane with pure water, then soak it in pure water for 8 hours, and change the water every 2 hours in the middle;

[0025] (2) immerse the above-mentioned processed basement film in the sodium polystyrene sulfonate solution with a concentration of 0.06mol / L, that is, in the polyanion solution, the solution contains 0.5mol / L of NaCl, and its pH value is 2.2, Soak for 20 minutes, then wash with pure water, then soak for another 20 minutes;

[0026] (3) The above-mentioned polyethersulfone base membrane treated with the polyanion solution is immersed in the polydiallyldimethylammonium chloride solution with a concentration of 0.05mol / L, that is, the polycation solution, which contains 1.0 mol / L NaCl, its pH value is 2.3, soaked for 20 minutes, then washed with pure water, and then soaked for 20 minutes;

[0...

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Abstract

The invention relates to a method for preparing composite nanofiltration membrane, to the field of film separating technology. The electrolyte multilayer film is assembled on the substrate film as an ultrathin separating film using layers static self-assembly technology, to obtain the composite nanofiltration membrane. The preparation method alternately immerges the substrate film into the polyanion solution and the polycation solution to alternately and repeatedly aggrade on the surface of the substrate film to get the composite nanofiltration membrane ultrathin separating layer after the assemble of a certain layers. The said polyanion solution is sodium polystyrene sulfonate or sodium polyacrylate; the said polycation solution is poly dimethyl diallyl ammonium chloride or polyallyl ammonium chloride, and the said substrate film is polyethersulfone ultrafiltration film or polysulfone ultrafiltration film. The method of the invention has a simple process, and the thickness of ultrathin separating layer is controlled. The compositenanofiltration membrane has a using foreground in the field of sea water and bitter desalination, sewage disposal and callback, ultra pure water preparation and so on.

Description

technical field [0001] The invention relates to a preparation method of a composite nanofiltration membrane, which belongs to the technical field of membrane separation. Background technique [0002] Membrane separation technology refers to the method of separating, purifying and enriching two-component or multi-component solutes or solvents with artificially synthesized or natural polymer membranes, driven by external energy or chemical potential difference. It is suitable for separating substances that are difficult to separate, have low concentrations, and have similar molecular structures. Membrane separation technology has been developed for more than 200 years. It was not until the mid-1960s that membrane separation technology was applied in industry. Membrane separation processes mainly include microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO). For microfiltration and ultrafiltration, their pore size is large, and the separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/68B01D71/82
Inventor 方建慧刘达施利毅曹志源沈霞
Owner SHANGHAI UNIV
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