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Composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and support layer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of high calcium chloride retention rate, improve water flux, good application prospects, high Electronegativity effect

Pending Publication Date: 2021-12-31
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, there is an urgent need for a polyamide composite nanofiltration membrane and its preparation method to solve the problem of chlorine in the water body existing in conventional nanofiltration membranes in the prior art while ensuring a high rejection rate of sodium sulfate and a high water flux. The problem of high calcium retention rate

Method used

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  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof
  • Composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A composite nanofiltration membrane comprising a support layer and a polyamide functional layer arranged on the support layer, the polyamide functional layer comprising the following raw material components: polyamine, water phase additive, polyacyl chloride, oil phase solvent and deionized Water; the water phase additive is hydroxylamine-O-sulfonic acid.

[0028] The polyamine is piperazine.

[0029] The polybasic acid chloride is trimesoyl chloride.

[0030] The oil phase solvent is n-hexane.

[0031] The support layer includes a base layer and a porous ultrafiltration layer arranged on the base layer, and the base layer (specifically, non-woven fabric) adopts a polyester raw material component; the porous ultrafiltration layer adopts a raw material component For polyethersulfone.

[0032] The specific preparation process of the support layer is as follows: Weigh 75g of polyethersulfone (PES) and 425g of N-methylpyrrolidone (NMP), mix and prepare a 500g solution, s...

Embodiment 2

[0043] The difference from Example 1 is that the polyamine is 1,6-hexanediamine.

Embodiment 3

[0045] The difference from Example 1 is that the polyamine is 1,4-diaminocyclohexane.

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Abstract

The invention provides a composite nanofiltration membrane and a preparation method thereof; the composite nanofiltration membrane comprises a support layer and a polyamide functional layer arranged on the support layer, wherein the polyamide functional layer comprises the following raw material components: polyamine, a water phase additive, polyacyl chloride, an oil phase solvent and deionized water; wherein the water phase additive is a sulfonic amine substance. The preparation method comprises the following steps: S1, respectively preparing a water phase solution and an oil phase solution; and S2, preparing the composite nanofiltration membrane. The retention rate of the prepared composite nanofiltration membrane on sodium sulfate is as high as 99.61%, wherein the retention rate of calcium chloride is as low as 22.39%, and the water flux is as high as 51.36 LMH.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membrane preparation, in particular to a composite nanofiltration membrane and a preparation method thereof. Background technique [0002] With the continuous improvement of the quality of life, people have higher and higher requirements for mineral content in mineral water, especially the content of calcium ions in mineral water. The conventional nanofiltration membrane currently used in the market has a high retention rate for inorganic salts (such as sodium sulfate and calcium chloride, etc.) in the water body, and then removes a large amount of inorganic salts in the water body, making the calcium ion content in mineral water low. However, calcium is an indispensable and important element for the human body and is essential to human health. In addition, studies have shown that drinking water rich in calcium ions has a positive effect on bone remodeling biomarkers and bone density param...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/10B01D71/56B01D67/00B01D61/02
CPCB01D69/12B01D69/10B01D71/56B01D67/0002B01D67/0088B01D67/0083B01D61/027
Inventor 喻慧路宏伟彭博胡群辉廖骞贺攀贺妍博彭军
Owner HUNAN OVAY TECH CO LTD
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