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Composite nanofiltration membrane, and preparation method and applications thereof

A composite nanofiltration membrane and composite membrane technology are applied in the field of separation membranes, which can solve the problems of low flux and poor durability of nanofiltration membranes, and achieve the effects of simple preparation method, improved hydrophilicity, and improved water flux.

Active Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the aspect of preparation technology of nanofiltration membrane, there are mainly phase inversion method and composite method at present. Phase inversion method is a relatively simple method for preparing nanofiltration membrane, but the prepared nanofiltration membrane has problems such as poor durability and low flux.

Method used

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preparation example Construction

[0030] The second aspect of the present invention provides the preparation method of above-mentioned composite nanofiltration membrane, and described preparation method comprises the following steps:

[0031] (1) By interfacial polymerization, a polyamide separation layer containing phytic acid is formed on one surface of the support layer to obtain a composite membrane;

[0032] (2) The surface of the polyamide separation layer of the composite membrane obtained in step (1) is contacted with a polyvalent metal cation solution to carry out chelation crosslinking to obtain the composite nanofiltration membrane.

[0033] In the method of the present invention, the way to obtain the polyamide separation layer is not particularly limited, and can be various conventional contact methods used in the field to carry out interfacial polymerization of polyamines and polyacyl chlorides. Preferably, the support layer is sequentially combined with The polyamine solution containing phytic a...

Embodiment 1

[0050] Contact the upper surface of the support layer (the surface of the polysulfone layer, the same below) with an aqueous solution containing 0.5wt% polyethyleneimine and 0.05wt% phytic acid, and discharge the liquid after contacting for 10s at 25°C; then, put the upper surface of the support layer again Contact the Isopar E solution containing 0.1wt% trimesoyl chloride, drain the liquid after contacting at 25°C for 10s, put the film into an oven, and heat at 70°C for 3min to obtain a composite film. The membrane was then immersed in 5 wt% FeCl 3 In the aqueous solution, the immersion temperature is 25°C, and the immersion time is 5min. After taking it out, wash it with deionized water. A nanofiltration membrane N1 was obtained, wherein the thickness of the separation layer was 0.33 μm.

Embodiment 2

[0052] Contact the upper surface of the support layer with phytic acid aqueous solution containing 1wt% polyethyleneimine and 10wt%, and discharge the liquid after contacting for 10s at 25°C; then, contact the upper surface of the support layer with 0.2wt% trimesoyl chloride. After the Isopar E solution was exposed to 25°C for 10s and drained, the film was placed in an oven and heated at 70°C for 3 minutes to obtain a composite film. The membrane was then immersed in 10wt% CuSO 4 In the aqueous solution, the immersion temperature is 25°C, and the immersion time is 10min. After taking it out, wash it with deionized water. A nanofiltration membrane N2 was obtained, wherein the thickness of the separation layer was 0.48 μm.

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Abstract

The invention belongs to the field of separation membranes, and discloses a composite nanofiltration membrane, and a preparation method and an applications thereof. The composite nanofiltration membrane comprises a support layer and a polyamide separation layer; the polyamide separation layer contains phytic acid and multivalent metal cations chelated with phytic acid. According to the composite nanofiltration membrane disclosed by the invention, phytic acid is introduced in an interfacial polymerization process, so that the phytic acid and amino form hydrogen bonds to be fixed in a polyamidelayer, the phytic acid in the polyamide layer is chelated through multivalent metal cations, and surface crosslinking is realized so as to improve the salt rejection rate; meanwhile, phosphate groupsin phytic acid molecules improve the hydrophilicity of the polyamide surface, and the water flux of the nanofiltration membrane is improved. Meanwhile, the preparation method of the composite nanofiltration membrane is simple and has a great industrial application prospect.

Description

technical field [0001] The invention belongs to the field of separation membranes, and more specifically relates to a composite nanofiltration membrane and its preparation method and application. 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 separation science. [0003] The core of membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D69/10B01D61/02C02F1/44
CPCB01D69/12B01D67/0002B01D69/10B01D61/027C02F1/442B01D2325/36Y02A20/131
Inventor 张杨刘轶群潘国元
Owner CHINA PETROLEUM & CHEM CORP
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