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Method for preparing composite nanofiltration membrane by employing interfacial polymerization process

A technology of composite nanofiltration membrane and interfacial polymerization method, which is applied in the field of composite nanofiltration membrane prepared by interfacial polymerization method, can solve the problems of high energy consumption, high operating pressure of nanofiltration membrane, and reduce the operating pressure of nanofiltration membrane, so as to save energy consumption, good application prospects, and low operating pressure

Active Publication Date: 2014-07-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical purpose of the present invention is to provide a method for preparing nanofiltration membranes by interfacial polymerization in view of the problems of high operating pressure and high energy consumption of the above-mentioned nanofiltration membranes, through which a membrane with a loose structure can be formed on a porous support layer. layer, which is beneficial to reduce the operating pressure of the nanofiltration membrane

Method used

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  • Method for preparing composite nanofiltration membrane by employing interfacial polymerization process

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Embodiment 1

[0029] In this embodiment, the PVDF ultrafiltration membrane is used as the porous support layer, the aqueous solution of piperazine is used as the water phase solution, and the toluene solution of cyanuric chloride is used as the oil phase solution, and the composite nanofiltration membrane is prepared by interfacial polymerization. Specific steps are as follows:

[0030] Step 1: Use PVDF flat ultrafiltration membrane as the porous support layer;

[0031] Step 2: configure the aqueous phase solution, the mass percentage concentration of piperazine in the aqueous phase solution is 1.0%, and triethylamine and sodium lauryl sulfate are also included in the aqueous phase solution, wherein, the quality of sodium lauryl sulfate The percentage concentration is 0.1%;

[0032] Configure the oil phase solution, the mass percent concentration of cyanuric chloride in the oil phase solution is 1.0%;

[0033] The ratio of the amount of triethylamine in the aqueous phase solution to the a...

Embodiment 2

[0041] In this embodiment, the PVDF hollow fiber ultrafiltration membrane is used as the porous support layer, the aqueous solution of m-phenylenediamine is used as the water phase solution, and the benzene solution of cyanuric chloride is used as the oil phase solution, and the composite nanofiltration membrane is prepared by interfacial polymerization. .

[0042] Specific steps are as follows:

[0043] Step 1: Use PVDF hollow fiber ultrafiltration membrane as the porous support layer;

[0044] Step 2: configure the water phase solution, the mass percentage concentration of m-phenylenediamine in the water phase solution is 1.0%, and the water phase solution also includes potassium hydroxide and sodium dodecylsulfonate, wherein dodecylsulfonate The mass percent concentration of sodium nitrate is 0.1%;

[0045] Configure the oil phase solution, the mass percent concentration of cyanuric chloride in the oil phase solution is 0.8%;

[0046] The ratio of the amount of potassium...

Embodiment 3

[0054] In this example, the polysulfone hollow fiber ultrafiltration membrane is used as the porous support layer, the aqueous solution of triethanolamine is used as the aqueous phase solution, the ethyl acetate solution of hexachlorocyclotriphosphazene is used as the oil phase solution, and the composite Nanofiltration. Specific steps are as follows:

[0055] Step 1: using polysulfone hollow fiber ultrafiltration membrane as a porous support layer;

[0056] Step 2: configure the aqueous phase solution, the mass percentage concentration of triethanolamine in the aqueous phase solution is 0.1%, potassium hydroxide and cetyl dimethyl benzyl ammonium chloride are also included in the aqueous phase solution, wherein, cetyl Alkyl dimethyl benzyl ammonium chloride mass percent concentration is 0.05%;

[0057] An oil phase solution is configured, and the mass percent concentration of hexachlorocyclotriphosphazene in the oil phase solution is 0.3%.

[0058] The ratio of the amount ...

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Abstract

The invention provides a method for preparing a composite nanofiltration membrane by employing an interfacial polymerization process. The method comprises: taking an ultrafilter membrane as a porous supporting layer, selecting cyanuric chloride and / or phosphonitrilic chloride trimer as an oil-phase solute which is subjected to a polymerization reaction with a water-phase solute at the interface of the two phases, controlling the reaction temperature to activate all groups in the reaction monomers, and introducing different active nucleophilic reagents step by step to connect to specific groups, so as to form a membrane selection layer with a loose structure on the surface of the porous supporting layer. Experiments confirm that the composite nanofiltration membrane prepared by utilizing the method is applicable to separation of low-molecular-weight organics and inorganic salts, monovalent ions and divalent ions, and the like; and the composite nanofiltration membrane has the advantage of low operation pressure, helps to effectively save energy consumption and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of membrane material modification, and in particular relates to an interface polymerization method for preparing composite nanofiltration membranes. Background technique [0002] The nanofiltration membrane is a pressure-driven membrane developed after the 1980s between the ultrafiltration membrane and the reverse osmosis membrane, and its operating pressure is lower than that of the reverse osmosis membrane. Nanofiltration membrane separation is carried out at room temperature, without chemical reaction, without phase change, without destroying biological activity, and can effectively intercept divalent and high-valent salts and organic small molecules with hundreds of molecular weights, while allowing most monovalent inorganic salts to pass through. , can separate similar amino acids and proteins, realize the separation of high molecular weight and low molecular weight organic matter, and the cost is lower...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D67/00B01D69/10B01D69/12
Inventor 薛立新赵秀兰陶慷章勤聂锋
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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