Nanofiltration membrane as well as preparation method and application thereof

A technology of nanofiltration membrane and separation layer, applied in the field of separation membrane, can solve the problem of only 98% of divalent ion rejection rate, achieve excellent salt rejection rate and water permeability, improve crosslinking density, and improve the effect of hydrophilicity

Pending Publication Date: 2021-11-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of composite membrane has good water permeability, but the rejection rate of divalent ions is only about 98%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The upper surface of the above-mentioned polysulfone supporting layer is contacted with an aqueous solution containing 0.4% by weight of branched polyethyleneimine and 0.1% by weight of piperazine, and the liquid is drained after contacting at 25° C. for 60 seconds; then, the upper surface of the supporting layer is again contacted with an aqueous solution containing 0.4 1,3,5-benzenetricarboxylic acid chloride by weight and 0.1% by weight 1,4-phthaloyl dicarboxylic acid Isopar E solution, drain after contacting at 25°C for 60s; then, put the film into an oven at 120°C Heat for 1 min to obtain a composite film. Then the polyamide surface of the obtained composite membrane is contacted with an aqueous solution of phytic acid containing 5% by weight, and the solution temperature is 60° C. After contacting for 60 seconds, the liquid is drained, and the membrane is repeatedly washed with deionized water until the surface is neutral to obtain phytic acid. Modified polyamide ...

Embodiment 2

[0062] The upper surface of the above-mentioned polysulfone support layer is contacted with an aqueous solution containing 1.8% by weight of branched polyethyleneimine and 0.2% by weight of piperazine, and is drained after contacting for 60 seconds at 25°C; then, the upper surface of the support layer is again contacted with a solution containing 0.25% by weight 1,3,5-benzenetricarboxylic acid chloride by weight and 0.25% by weight 1,4-phthaloyl dicarboxylic acid Isopar E solution, drain after contacting at 25°C for 60s; then, put the film into an oven at 50°C Under heating for 10 min, a composite film was obtained. Then the polyamide surface of the obtained composite membrane is contacted with an aqueous solution of phytic acid containing 5% by weight, the solution temperature is 30° C., after contacting for 60 seconds, the liquid is drained, and the membrane is repeatedly washed with deionized water until the surface is neutral to obtain phytic acid. Modified polyamide compo...

Embodiment 3

[0064] The upper surface of the above-mentioned polysulfone support layer is contacted with an aqueous solution containing 0.5% by weight of branched polyethyleneimine and 0.5% by weight of piperazine, and the liquid is drained after contacting for 60 seconds at 25° C.; then, the upper surface of the support layer is again contacted with an aqueous solution containing 0.1 1,3,5-benzenetricarboxylic acid chloride by weight and 0.1% by weight 1,4-phthaloyl dicarboxylic acid Isopar E solution, drain after contacting at 25°C for 60s; then, put the film into an oven at 70°C Under heating for 3 minutes, a composite film was obtained. Then the polyamide surface of the obtained composite membrane is contacted with a phytic acid aqueous solution containing 5% by weight, and the solution temperature is 50° C., after contacting for 60 seconds, the liquid is drained, and the membrane is repeatedly washed with deionized water until the surface is neutral to obtain phytic acid. Modified pol...

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Abstract

The invention relates to a nanofiltration membrane, a preparation method thereof and application of the nanofiltration membrane in the field of water treatment. The nanofiltration membrane comprises a supporting layer and a polyamide separation layer which are attached to each other, and phytic acid is chelated on the surface of the polyamide separation layer. The polyamide separation layer and the phytic acid are chelated and crosslinked, so that the phytic acid is chelated on the surface of the separation layer. The phytic acid and amino groups on the surface of the polyamide functional layer are subjected to chelation cross-linking reaction, so that the cross-linking density of the polyamide separating layer is improved, and the hindering effect on salt ion permeation is enhanced; on the other hand, after the surface of the polyamide is modified by phytic acid, the hydrophilicity of the membrane is improved, and permeation of water molecules is facilitated. In addition, the nanofiltration membrane provided by the invention has excellent salt rejection rate and water permeability, the preparation method is simple, and the nanofiltration membrane has great industrial application prospects.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a nanofiltration membrane, a preparation method thereof and an application of the nanofiltration membrane in the field of water treatment. Background technique [0002] Membrane separation technology is a new separation technology that appeared in the early 20th century and rose rapidly after the 1960s. Because membrane separation technology not only has the functions of separation, concentration, purification and refining, but also has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration, simple filtration process and easy control, it is widely used in food, medicine, biology, environmental protection, chemical industry , metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields, and has produced huge economic and social benefits, and has become one of the most important means in today's separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D67/00C02F1/44
CPCB01D69/125B01D69/10B01D67/0006C02F1/442
Inventor 张杨潘国元刘轶群于浩
Owner CHINA PETROLEUM & CHEM CORP
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