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Polyamide composite reverse osmosis membrane with chlorine resistance and preparation method thereof

A technology of reverse osmosis membrane and polyamide, applied in the field of polyamide composite reverse osmosis membrane and its preparation, can solve problems such as poor resistance to active chlorine, achieve simple and easy preparation method, improve chlorine resistance, and simple and easy process row effect

Active Publication Date: 2020-06-16
自然资源部天津海水淡化与综合利用研究所
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the polyamide composite reverse osmosis membrane has poor tolerance to active chlorine in water, and propose a new polyamide composite reverse osmosis membrane with chlorine resistance and its preparation method, without significantly affecting the water Improve the chlorine resistance of the membrane while improving the flux and desalination rate

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  • Polyamide composite reverse osmosis membrane with chlorine resistance and preparation method thereof
  • Polyamide composite reverse osmosis membrane with chlorine resistance and preparation method thereof

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preparation example Construction

[0045] The present invention also provides a method for preparing a polyamide composite reverse osmosis membrane with chlorine resistance, comprising the following steps: (1) preparation of nascent polyamide composite reverse osmosis membrane; (2) pre-assembly of sulfur-containing sacrificial functional components (3) Modification of the surface of nascent polyamide composite reverse osmosis membrane with sulfur-containing sacrificial functional components.

[0046] In step (1), an aromatic polyamide separation layer is prepared on the porous ultrafiltration membrane support layer to obtain a nascent polyamide composite reverse osmosis membrane; in step (2), polyamine mediation units and sulfur-containing sacrificial unit to obtain sulfur-containing sacrificial functional components; in step (3), the sulfur-containing sacrificial functional components are loaded on the surface of the nascent polyamide composite reverse osmosis membrane by chemical bonding, and a chlorine-resist...

Embodiment 1

[0072] The polyamide composite reverse osmosis membrane with chlorine resistance in this example uses the nascent polyamide composite reverse osmosis membrane in the preparation process of the comparative example as the membrane to be modified. The preparation of sulfur-containing sacrificial functional components is as follows: 24mmol α-lipoic acid (LA), 30mmol N,N'-disuccinimidyl carbonate and 12mmol diisopropylethylamine were dissolved in 60mL acetone, under argon atmosphere The system was reacted overnight under protection, dark and normal temperature conditions; acetone was distilled off under reduced pressure, the residue was dissolved in dichloromethane, washed three times with pure water, and the organic phase was dried over anhydrous magnesium sulfate, filtered and concentrated to obtain the activated carboxyl group. Sulfur sacrificial unit LA * ; The sulfur-containing sacrificial unit LA after activation of 14 mmol carboxyl groups * , 14mmol ethylenediamine (EDA) an...

Embodiment 2

[0075] The polyamide composite reverse osmosis membrane with chlorine resistance in this example uses the nascent polyamide composite reverse osmosis membrane in the preparation process of the comparative example as the membrane to be modified. The preparation of sulfur-containing sacrificial functional components is as follows: 24mmol reduced glutathione (GSH), 48mmol N,N'-disuccinimidyl carbonate and 24mmol diisopropylethylamine were dissolved in 60mL acetone, The system was reacted overnight under the protection of argon, protected from light and at room temperature; the acetone was distilled off under reduced pressure, the residue was dissolved in dichloromethane, washed three times with pure water, the organic phase was dried with anhydrous magnesium sulfate, filtered and concentrated to obtain the activated carboxyl group Sulfur-containing sacrificial unit GSH * ; The sulfur-containing sacrificial unit GSH after activation of 14 mmol carboxyl groups * , 35mmol diethylen...

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Abstract

The invention belongs to the technical field of organic membrane materials, and particularly relates to a polyamide composite reverse osmosis membrane with chlorine resistance and a preparation methodof the polyamide composite reverse osmosis membrane. The polyamide composite reverse osmosis membrane comprises a porous ultrafiltration membrane support layer, an aromatic polyamide separation layerand a sulfur-containing sacrificial functional component. The porous ultrafiltration membrane supporting layer is covered with the aromatic polyamide separation layer, the aromatic polyamide separation layer is covered with the sulfur-containing sacrificial functional component, and the sulfur-containing sacrificial functional component is connected with the aromatic polyamide separation layer through a covalent bond to form the polyamide composite reverse osmosis membrane with chlorine resistance. The sulfur-containing sacrificial functional component comprises a polyamine mediation unit anda sulfur-containing sacrificial unit, and the polyamine mediation unit and the sulfur-containing sacrificial unit are covalently bonded and pre-assembled and then introduced to the surface of the aromatic polyamide separation layer through a chemical bonding method. The sulfur-containing sacrificial functional component can effectively prevent active chlorine from diffusing to the aromatic polyamide separation layer, so that the chlorine resistance of the polyamide composite reverse osmosis membrane is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of organic membrane materials, in particular to a reverse osmosis membrane and a preparation method thereof, in particular to a polyamide composite reverse osmosis membrane with chlorine resistance and a preparation method thereof. Background technique [0002] Polyamide composite reverse osmosis membrane has become the most widely used reverse osmosis membrane material due to its good desalination characteristics, high water flux and mature industrial production conditions. However, the aromatic polyamide structure in the polyamide separation layer is easily oxidized by active chlorine antibacterial agents or cleaning agents such as hypochlorous acid, chloramine, etc. replaced by chlorine atoms. At this time, the interchain hydrogen bonds in the separation layer are weakened, while the degree of freedom and free volume increase, resulting in a significant decline in the desalination performance of the memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/56B01D69/12B01D69/02B01D67/00
CPCB01D67/0002B01D67/0093B01D69/02B01D69/12B01D69/125B01D71/56B01D71/82B01D2325/30
Inventor 张潇泰黄海张慧峰冯厚军李晓明
Owner 自然资源部天津海水淡化与综合利用研究所
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