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Method for preparing structure and performance controllable super nanofiltration membrane

A nanofiltration membrane and ultrafiltration membrane technology, applied in the field of new nanofiltration membrane separation, can solve the problems of inability to achieve anti-pollution and permeation performance, membrane flux decline, desalination layer shedding, etc. Inexpensive and readily available, hydrophilicity-enhancing effect

Inactive Publication Date: 2015-04-01
BEIJING ORIGIN WATER PURETECH CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such methods often cause the desalination layer to fall off due to poor bonding between the base film and the first layer of desalination layer; or "obtain a polyamide desalination layer through acid chloride reaction, and then continue Coating or cross-linking hydrophilic charge-neutral polymer” approach to optimize the performance of nanofiltration membranes, but this method often leads to a significant decrease in the flux of the membrane, and cannot achieve both anti-pollution and permeability performance
[0009] Aiming at problems such as single species, low performance, poor anti-pollution and chlorine resistance, and inability to meet the long-term stability requirements of practical applications, etc., which exist in nanofiltration membranes, the present invention is proposed

Method used

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  • Method for preparing structure and performance controllable super nanofiltration membrane
  • Method for preparing structure and performance controllable super nanofiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Soak the polysulfone ultrafiltration base membrane in a solution of 1% sodium lauryl sulfate for 4 hours, and then wash it with pure water; prepare a humectant triethylamine with a mass fraction of 0.1% of piperazine and a mass fraction of 0.3% Aqueous solution of amine camphorsulfonate, stirred evenly; prepare 0.08wt% n-hexane solution of polyfunctional acid chloride. Fix the polysulfone ultrafiltration membrane (molecular weight cut off about 68,000) on a glass plate, then pour a certain volume of aqueous phase solution into the surface of the ultrafiltration membrane, leave it for 10 seconds, then pour out the aqueous phase solution, and then pour the The water phase on the surface of the membrane is dried, so that the surface of the porous support is evenly attached to the solute of the amino or hydroxyl compound, and then a certain volume of the oil phase solution is poured into the membrane surface, and after standing for 10 seconds, the oil phase is poured out and...

Embodiment 2

[0036] It is the aqueous phase solution of the humectant triethylamine camphorsulfonate that the massfraction is 0.3% that the piperazine that configuration contains massfraction, the polyester polyol of 0.1% and massfraction are 0.3%, other operation steps are with embodiment 1.

Embodiment 3

[0038] It is the aqueous phase solution of the humectant triethylamine camphorsulfonate that the mass fraction is 0.3% that the piperazine that configuration contains mass fraction is 0.1%, the polyester diol that mass fraction is 0.1% and mass fraction, other operation steps are with embodiment 1 .

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Abstract

The invention provides a method for preparing a structure and performance controllable super nanofiltration membrane. The method comprises the following steps: a pre-treatment step of a base membrane, a preparation step of an aqueous phase solution, a preparation step of an oil phase solution and a treatment step of the base membrane. According to the preparation method provided by the invention, a loose polyamide desalinated layer with adjustable height, electric neutrality on the surface and a high hydrophilic structure is formed by controlling the proportion and concentration of a reaction monomer, the active environment and temperature of the reaction monomer and the molecular weight and alcoholysis degree of a polymer and the like, so that the flux of the membrane is obviously improved. Meanwhile, the charge property of the membrane surface is remarkably reduced, and the high flux anti-pollution super nanofiltration membrane is prepared. The desalinization ratio of the prepared super nanofiltration membrane on NaCl is 10-90% and the effective reject rate for organic molecules with the molar weight ranging from 400 to 5000 is over 90% while high flux is guaranteed.

Description

technical field [0001] The invention relates to a novel nanofiltration membrane separation technology, in particular to a method for preparing a super nanofiltration membrane with controllable structure and performance. Background technique [0002] Nanofiltration membrane is a new membrane separation technology between ultrafiltration and reverse osmosis, its operating pressure range is 0.2-1.0MPa, and the molecular weight cut-off of the membrane is in the range of 200-2000. Compared with the membrane separation technology of ultrafiltration membrane and reverse osmosis membrane, nanofiltration membrane still has high water flux and high rejection rate under lower operating pressure, especially for divalent ions and low molecular weight organic particles. The molecule has a high rejection (greater than 98%). Therefore, nanofiltration membranes are gradually and widely used in the fields of water treatment, medicine, food and biology. [0003] The preparation techniques of...

Claims

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Application Information

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IPC IPC(8): B01D71/56B01D67/00
Inventor 梁辉杜文林鲁纯
Owner BEIJING ORIGIN WATER PURETECH CO LTD
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